http://git-wip-us.apache.org/repos/asf/airavata/blob/25da582a/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskOutputChangeEvent.java
----------------------------------------------------------------------
diff --git 
a/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskOutputChangeEvent.java
 
b/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskOutputChangeEvent.java
new file mode 100644
index 0000000..da436b2
--- /dev/null
+++ 
b/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskOutputChangeEvent.java
@@ -0,0 +1,568 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Autogenerated by Thrift Compiler (0.9.2)
+ *
+ * DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+ *  @generated
+ */
+package org.apache.airavata.model.messaging.event;
+
+import org.apache.thrift.scheme.IScheme;
+import org.apache.thrift.scheme.SchemeFactory;
+import org.apache.thrift.scheme.StandardScheme;
+
+import org.apache.thrift.scheme.TupleScheme;
+import org.apache.thrift.protocol.TTupleProtocol;
+import org.apache.thrift.protocol.TProtocolException;
+import org.apache.thrift.EncodingUtils;
+import org.apache.thrift.TException;
+import org.apache.thrift.async.AsyncMethodCallback;
+import org.apache.thrift.server.AbstractNonblockingServer.*;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.EnumMap;
+import java.util.Set;
+import java.util.HashSet;
+import java.util.EnumSet;
+import java.util.Collections;
+import java.util.BitSet;
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+import javax.annotation.Generated;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@SuppressWarnings({"cast", "rawtypes", "serial", "unchecked"})
+@Generated(value = "Autogenerated by Thrift Compiler (0.9.2)", date = 
"2015-12-2")
+public class TaskOutputChangeEvent implements 
org.apache.thrift.TBase<TaskOutputChangeEvent, TaskOutputChangeEvent._Fields>, 
java.io.Serializable, Cloneable, Comparable<TaskOutputChangeEvent> {
+  private static final org.apache.thrift.protocol.TStruct STRUCT_DESC = new 
org.apache.thrift.protocol.TStruct("TaskOutputChangeEvent");
+
+  private static final org.apache.thrift.protocol.TField OUTPUT_FIELD_DESC = 
new org.apache.thrift.protocol.TField("output", 
org.apache.thrift.protocol.TType.LIST, (short)1);
+  private static final org.apache.thrift.protocol.TField 
TASK_IDENTITY_FIELD_DESC = new 
org.apache.thrift.protocol.TField("taskIdentity", 
org.apache.thrift.protocol.TType.STRUCT, (short)2);
+
+  private static final Map<Class<? extends IScheme>, SchemeFactory> schemes = 
new HashMap<Class<? extends IScheme>, SchemeFactory>();
+  static {
+    schemes.put(StandardScheme.class, new 
TaskOutputChangeEventStandardSchemeFactory());
+    schemes.put(TupleScheme.class, new 
TaskOutputChangeEventTupleSchemeFactory());
+  }
+
+  public List<org.apache.airavata.model.application.io.OutputDataObjectType> 
output; // required
+  public TaskIdentifier taskIdentity; // required
+
+  /** The set of fields this struct contains, along with convenience methods 
for finding and manipulating them. */
+  public enum _Fields implements org.apache.thrift.TFieldIdEnum {
+    OUTPUT((short)1, "output"),
+    TASK_IDENTITY((short)2, "taskIdentity");
+
+    private static final Map<String, _Fields> byName = new HashMap<String, 
_Fields>();
+
+    static {
+      for (_Fields field : EnumSet.allOf(_Fields.class)) {
+        byName.put(field.getFieldName(), field);
+      }
+    }
+
+    /**
+     * Find the _Fields constant that matches fieldId, or null if its not 
found.
+     */
+    public static _Fields findByThriftId(int fieldId) {
+      switch(fieldId) {
+        case 1: // OUTPUT
+          return OUTPUT;
+        case 2: // TASK_IDENTITY
+          return TASK_IDENTITY;
+        default:
+          return null;
+      }
+    }
+
+    /**
+     * Find the _Fields constant that matches fieldId, throwing an exception
+     * if it is not found.
+     */
+    public static _Fields findByThriftIdOrThrow(int fieldId) {
+      _Fields fields = findByThriftId(fieldId);
+      if (fields == null) throw new IllegalArgumentException("Field " + 
fieldId + " doesn't exist!");
+      return fields;
+    }
+
+    /**
+     * Find the _Fields constant that matches name, or null if its not found.
+     */
+    public static _Fields findByName(String name) {
+      return byName.get(name);
+    }
+
+    private final short _thriftId;
+    private final String _fieldName;
+
+    _Fields(short thriftId, String fieldName) {
+      _thriftId = thriftId;
+      _fieldName = fieldName;
+    }
+
+    public short getThriftFieldId() {
+      return _thriftId;
+    }
+
+    public String getFieldName() {
+      return _fieldName;
+    }
+  }
+
+  // isset id assignments
+  public static final Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> 
metaDataMap;
+  static {
+    Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> tmpMap = new 
EnumMap<_Fields, org.apache.thrift.meta_data.FieldMetaData>(_Fields.class);
+    tmpMap.put(_Fields.OUTPUT, new 
org.apache.thrift.meta_data.FieldMetaData("output", 
org.apache.thrift.TFieldRequirementType.REQUIRED, 
+        new 
org.apache.thrift.meta_data.ListMetaData(org.apache.thrift.protocol.TType.LIST, 
+            new 
org.apache.thrift.meta_data.StructMetaData(org.apache.thrift.protocol.TType.STRUCT,
 org.apache.airavata.model.application.io.OutputDataObjectType.class))));
+    tmpMap.put(_Fields.TASK_IDENTITY, new 
org.apache.thrift.meta_data.FieldMetaData("taskIdentity", 
org.apache.thrift.TFieldRequirementType.REQUIRED, 
+        new 
org.apache.thrift.meta_data.StructMetaData(org.apache.thrift.protocol.TType.STRUCT,
 TaskIdentifier.class)));
+    metaDataMap = Collections.unmodifiableMap(tmpMap);
+    
org.apache.thrift.meta_data.FieldMetaData.addStructMetaDataMap(TaskOutputChangeEvent.class,
 metaDataMap);
+  }
+
+  public TaskOutputChangeEvent() {
+  }
+
+  public TaskOutputChangeEvent(
+    List<org.apache.airavata.model.application.io.OutputDataObjectType> output,
+    TaskIdentifier taskIdentity)
+  {
+    this();
+    this.output = output;
+    this.taskIdentity = taskIdentity;
+  }
+
+  /**
+   * Performs a deep copy on <i>other</i>.
+   */
+  public TaskOutputChangeEvent(TaskOutputChangeEvent other) {
+    if (other.isSetOutput()) {
+      List<org.apache.airavata.model.application.io.OutputDataObjectType> 
__this__output = new 
ArrayList<org.apache.airavata.model.application.io.OutputDataObjectType>(other.output.size());
+      for (org.apache.airavata.model.application.io.OutputDataObjectType 
other_element : other.output) {
+        __this__output.add(new 
org.apache.airavata.model.application.io.OutputDataObjectType(other_element));
+      }
+      this.output = __this__output;
+    }
+    if (other.isSetTaskIdentity()) {
+      this.taskIdentity = new TaskIdentifier(other.taskIdentity);
+    }
+  }
+
+  public TaskOutputChangeEvent deepCopy() {
+    return new TaskOutputChangeEvent(this);
+  }
+
+  @Override
+  public void clear() {
+    this.output = null;
+    this.taskIdentity = null;
+  }
+
+  public int getOutputSize() {
+    return (this.output == null) ? 0 : this.output.size();
+  }
+
+  public 
java.util.Iterator<org.apache.airavata.model.application.io.OutputDataObjectType>
 getOutputIterator() {
+    return (this.output == null) ? null : this.output.iterator();
+  }
+
+  public void 
addToOutput(org.apache.airavata.model.application.io.OutputDataObjectType elem) 
{
+    if (this.output == null) {
+      this.output = new 
ArrayList<org.apache.airavata.model.application.io.OutputDataObjectType>();
+    }
+    this.output.add(elem);
+  }
+
+  public List<org.apache.airavata.model.application.io.OutputDataObjectType> 
getOutput() {
+    return this.output;
+  }
+
+  public TaskOutputChangeEvent 
setOutput(List<org.apache.airavata.model.application.io.OutputDataObjectType> 
output) {
+    this.output = output;
+    return this;
+  }
+
+  public void unsetOutput() {
+    this.output = null;
+  }
+
+  /** Returns true if field output is set (has been assigned a value) and 
false otherwise */
+  public boolean isSetOutput() {
+    return this.output != null;
+  }
+
+  public void setOutputIsSet(boolean value) {
+    if (!value) {
+      this.output = null;
+    }
+  }
+
+  public TaskIdentifier getTaskIdentity() {
+    return this.taskIdentity;
+  }
+
+  public TaskOutputChangeEvent setTaskIdentity(TaskIdentifier taskIdentity) {
+    this.taskIdentity = taskIdentity;
+    return this;
+  }
+
+  public void unsetTaskIdentity() {
+    this.taskIdentity = null;
+  }
+
+  /** Returns true if field taskIdentity is set (has been assigned a value) 
and false otherwise */
+  public boolean isSetTaskIdentity() {
+    return this.taskIdentity != null;
+  }
+
+  public void setTaskIdentityIsSet(boolean value) {
+    if (!value) {
+      this.taskIdentity = null;
+    }
+  }
+
+  public void setFieldValue(_Fields field, Object value) {
+    switch (field) {
+    case OUTPUT:
+      if (value == null) {
+        unsetOutput();
+      } else {
+        
setOutput((List<org.apache.airavata.model.application.io.OutputDataObjectType>)value);
+      }
+      break;
+
+    case TASK_IDENTITY:
+      if (value == null) {
+        unsetTaskIdentity();
+      } else {
+        setTaskIdentity((TaskIdentifier)value);
+      }
+      break;
+
+    }
+  }
+
+  public Object getFieldValue(_Fields field) {
+    switch (field) {
+    case OUTPUT:
+      return getOutput();
+
+    case TASK_IDENTITY:
+      return getTaskIdentity();
+
+    }
+    throw new IllegalStateException();
+  }
+
+  /** Returns true if field corresponding to fieldID is set (has been assigned 
a value) and false otherwise */
+  public boolean isSet(_Fields field) {
+    if (field == null) {
+      throw new IllegalArgumentException();
+    }
+
+    switch (field) {
+    case OUTPUT:
+      return isSetOutput();
+    case TASK_IDENTITY:
+      return isSetTaskIdentity();
+    }
+    throw new IllegalStateException();
+  }
+
+  @Override
+  public boolean equals(Object that) {
+    if (that == null)
+      return false;
+    if (that instanceof TaskOutputChangeEvent)
+      return this.equals((TaskOutputChangeEvent)that);
+    return false;
+  }
+
+  public boolean equals(TaskOutputChangeEvent that) {
+    if (that == null)
+      return false;
+
+    boolean this_present_output = true && this.isSetOutput();
+    boolean that_present_output = true && that.isSetOutput();
+    if (this_present_output || that_present_output) {
+      if (!(this_present_output && that_present_output))
+        return false;
+      if (!this.output.equals(that.output))
+        return false;
+    }
+
+    boolean this_present_taskIdentity = true && this.isSetTaskIdentity();
+    boolean that_present_taskIdentity = true && that.isSetTaskIdentity();
+    if (this_present_taskIdentity || that_present_taskIdentity) {
+      if (!(this_present_taskIdentity && that_present_taskIdentity))
+        return false;
+      if (!this.taskIdentity.equals(that.taskIdentity))
+        return false;
+    }
+
+    return true;
+  }
+
+  @Override
+  public int hashCode() {
+    List<Object> list = new ArrayList<Object>();
+
+    boolean present_output = true && (isSetOutput());
+    list.add(present_output);
+    if (present_output)
+      list.add(output);
+
+    boolean present_taskIdentity = true && (isSetTaskIdentity());
+    list.add(present_taskIdentity);
+    if (present_taskIdentity)
+      list.add(taskIdentity);
+
+    return list.hashCode();
+  }
+
+  @Override
+  public int compareTo(TaskOutputChangeEvent other) {
+    if (!getClass().equals(other.getClass())) {
+      return getClass().getName().compareTo(other.getClass().getName());
+    }
+
+    int lastComparison = 0;
+
+    lastComparison = 
Boolean.valueOf(isSetOutput()).compareTo(other.isSetOutput());
+    if (lastComparison != 0) {
+      return lastComparison;
+    }
+    if (isSetOutput()) {
+      lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.output, 
other.output);
+      if (lastComparison != 0) {
+        return lastComparison;
+      }
+    }
+    lastComparison = 
Boolean.valueOf(isSetTaskIdentity()).compareTo(other.isSetTaskIdentity());
+    if (lastComparison != 0) {
+      return lastComparison;
+    }
+    if (isSetTaskIdentity()) {
+      lastComparison = 
org.apache.thrift.TBaseHelper.compareTo(this.taskIdentity, other.taskIdentity);
+      if (lastComparison != 0) {
+        return lastComparison;
+      }
+    }
+    return 0;
+  }
+
+  public _Fields fieldForId(int fieldId) {
+    return _Fields.findByThriftId(fieldId);
+  }
+
+  public void read(org.apache.thrift.protocol.TProtocol iprot) throws 
org.apache.thrift.TException {
+    schemes.get(iprot.getScheme()).getScheme().read(iprot, this);
+  }
+
+  public void write(org.apache.thrift.protocol.TProtocol oprot) throws 
org.apache.thrift.TException {
+    schemes.get(oprot.getScheme()).getScheme().write(oprot, this);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder("TaskOutputChangeEvent(");
+    boolean first = true;
+
+    sb.append("output:");
+    if (this.output == null) {
+      sb.append("null");
+    } else {
+      sb.append(this.output);
+    }
+    first = false;
+    if (!first) sb.append(", ");
+    sb.append("taskIdentity:");
+    if (this.taskIdentity == null) {
+      sb.append("null");
+    } else {
+      sb.append(this.taskIdentity);
+    }
+    first = false;
+    sb.append(")");
+    return sb.toString();
+  }
+
+  public void validate() throws org.apache.thrift.TException {
+    // check for required fields
+    if (output == null) {
+      throw new org.apache.thrift.protocol.TProtocolException("Required field 
'output' was not present! Struct: " + toString());
+    }
+    if (taskIdentity == null) {
+      throw new org.apache.thrift.protocol.TProtocolException("Required field 
'taskIdentity' was not present! Struct: " + toString());
+    }
+    // check for sub-struct validity
+    if (taskIdentity != null) {
+      taskIdentity.validate();
+    }
+  }
+
+  private void writeObject(java.io.ObjectOutputStream out) throws 
java.io.IOException {
+    try {
+      write(new org.apache.thrift.protocol.TCompactProtocol(new 
org.apache.thrift.transport.TIOStreamTransport(out)));
+    } catch (org.apache.thrift.TException te) {
+      throw new java.io.IOException(te);
+    }
+  }
+
+  private void readObject(java.io.ObjectInputStream in) throws 
java.io.IOException, ClassNotFoundException {
+    try {
+      read(new org.apache.thrift.protocol.TCompactProtocol(new 
org.apache.thrift.transport.TIOStreamTransport(in)));
+    } catch (org.apache.thrift.TException te) {
+      throw new java.io.IOException(te);
+    }
+  }
+
+  private static class TaskOutputChangeEventStandardSchemeFactory implements 
SchemeFactory {
+    public TaskOutputChangeEventStandardScheme getScheme() {
+      return new TaskOutputChangeEventStandardScheme();
+    }
+  }
+
+  private static class TaskOutputChangeEventStandardScheme extends 
StandardScheme<TaskOutputChangeEvent> {
+
+    public void read(org.apache.thrift.protocol.TProtocol iprot, 
TaskOutputChangeEvent struct) throws org.apache.thrift.TException {
+      org.apache.thrift.protocol.TField schemeField;
+      iprot.readStructBegin();
+      while (true)
+      {
+        schemeField = iprot.readFieldBegin();
+        if (schemeField.type == org.apache.thrift.protocol.TType.STOP) { 
+          break;
+        }
+        switch (schemeField.id) {
+          case 1: // OUTPUT
+            if (schemeField.type == org.apache.thrift.protocol.TType.LIST) {
+              {
+                org.apache.thrift.protocol.TList _list0 = 
iprot.readListBegin();
+                struct.output = new 
ArrayList<org.apache.airavata.model.application.io.OutputDataObjectType>(_list0.size);
+                org.apache.airavata.model.application.io.OutputDataObjectType 
_elem1;
+                for (int _i2 = 0; _i2 < _list0.size; ++_i2)
+                {
+                  _elem1 = new 
org.apache.airavata.model.application.io.OutputDataObjectType();
+                  _elem1.read(iprot);
+                  struct.output.add(_elem1);
+                }
+                iprot.readListEnd();
+              }
+              struct.setOutputIsSet(true);
+            } else { 
+              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, 
schemeField.type);
+            }
+            break;
+          case 2: // TASK_IDENTITY
+            if (schemeField.type == org.apache.thrift.protocol.TType.STRUCT) {
+              struct.taskIdentity = new TaskIdentifier();
+              struct.taskIdentity.read(iprot);
+              struct.setTaskIdentityIsSet(true);
+            } else { 
+              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, 
schemeField.type);
+            }
+            break;
+          default:
+            org.apache.thrift.protocol.TProtocolUtil.skip(iprot, 
schemeField.type);
+        }
+        iprot.readFieldEnd();
+      }
+      iprot.readStructEnd();
+
+      // check for required fields of primitive type, which can't be checked 
in the validate method
+      struct.validate();
+    }
+
+    public void write(org.apache.thrift.protocol.TProtocol oprot, 
TaskOutputChangeEvent struct) throws org.apache.thrift.TException {
+      struct.validate();
+
+      oprot.writeStructBegin(STRUCT_DESC);
+      if (struct.output != null) {
+        oprot.writeFieldBegin(OUTPUT_FIELD_DESC);
+        {
+          oprot.writeListBegin(new 
org.apache.thrift.protocol.TList(org.apache.thrift.protocol.TType.STRUCT, 
struct.output.size()));
+          for (org.apache.airavata.model.application.io.OutputDataObjectType 
_iter3 : struct.output)
+          {
+            _iter3.write(oprot);
+          }
+          oprot.writeListEnd();
+        }
+        oprot.writeFieldEnd();
+      }
+      if (struct.taskIdentity != null) {
+        oprot.writeFieldBegin(TASK_IDENTITY_FIELD_DESC);
+        struct.taskIdentity.write(oprot);
+        oprot.writeFieldEnd();
+      }
+      oprot.writeFieldStop();
+      oprot.writeStructEnd();
+    }
+
+  }
+
+  private static class TaskOutputChangeEventTupleSchemeFactory implements 
SchemeFactory {
+    public TaskOutputChangeEventTupleScheme getScheme() {
+      return new TaskOutputChangeEventTupleScheme();
+    }
+  }
+
+  private static class TaskOutputChangeEventTupleScheme extends 
TupleScheme<TaskOutputChangeEvent> {
+
+    @Override
+    public void write(org.apache.thrift.protocol.TProtocol prot, 
TaskOutputChangeEvent struct) throws org.apache.thrift.TException {
+      TTupleProtocol oprot = (TTupleProtocol) prot;
+      {
+        oprot.writeI32(struct.output.size());
+        for (org.apache.airavata.model.application.io.OutputDataObjectType 
_iter4 : struct.output)
+        {
+          _iter4.write(oprot);
+        }
+      }
+      struct.taskIdentity.write(oprot);
+    }
+
+    @Override
+    public void read(org.apache.thrift.protocol.TProtocol prot, 
TaskOutputChangeEvent struct) throws org.apache.thrift.TException {
+      TTupleProtocol iprot = (TTupleProtocol) prot;
+      {
+        org.apache.thrift.protocol.TList _list5 = new 
org.apache.thrift.protocol.TList(org.apache.thrift.protocol.TType.STRUCT, 
iprot.readI32());
+        struct.output = new 
ArrayList<org.apache.airavata.model.application.io.OutputDataObjectType>(_list5.size);
+        org.apache.airavata.model.application.io.OutputDataObjectType _elem6;
+        for (int _i7 = 0; _i7 < _list5.size; ++_i7)
+        {
+          _elem6 = new 
org.apache.airavata.model.application.io.OutputDataObjectType();
+          _elem6.read(iprot);
+          struct.output.add(_elem6);
+        }
+      }
+      struct.setOutputIsSet(true);
+      struct.taskIdentity = new TaskIdentifier();
+      struct.taskIdentity.read(iprot);
+      struct.setTaskIdentityIsSet(true);
+    }
+  }
+
+}
+

http://git-wip-us.apache.org/repos/asf/airavata/blob/25da582a/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskStatusChangeEvent.java
----------------------------------------------------------------------
diff --git 
a/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskStatusChangeEvent.java
 
b/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskStatusChangeEvent.java
new file mode 100644
index 0000000..8420e72
--- /dev/null
+++ 
b/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskStatusChangeEvent.java
@@ -0,0 +1,530 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Autogenerated by Thrift Compiler (0.9.2)
+ *
+ * DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+ *  @generated
+ */
+package org.apache.airavata.model.messaging.event;
+
+import org.apache.thrift.scheme.IScheme;
+import org.apache.thrift.scheme.SchemeFactory;
+import org.apache.thrift.scheme.StandardScheme;
+
+import org.apache.thrift.scheme.TupleScheme;
+import org.apache.thrift.protocol.TTupleProtocol;
+import org.apache.thrift.protocol.TProtocolException;
+import org.apache.thrift.EncodingUtils;
+import org.apache.thrift.TException;
+import org.apache.thrift.async.AsyncMethodCallback;
+import org.apache.thrift.server.AbstractNonblockingServer.*;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.EnumMap;
+import java.util.Set;
+import java.util.HashSet;
+import java.util.EnumSet;
+import java.util.Collections;
+import java.util.BitSet;
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+import javax.annotation.Generated;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@SuppressWarnings({"cast", "rawtypes", "serial", "unchecked"})
+@Generated(value = "Autogenerated by Thrift Compiler (0.9.2)", date = 
"2015-12-2")
+public class TaskStatusChangeEvent implements 
org.apache.thrift.TBase<TaskStatusChangeEvent, TaskStatusChangeEvent._Fields>, 
java.io.Serializable, Cloneable, Comparable<TaskStatusChangeEvent> {
+  private static final org.apache.thrift.protocol.TStruct STRUCT_DESC = new 
org.apache.thrift.protocol.TStruct("TaskStatusChangeEvent");
+
+  private static final org.apache.thrift.protocol.TField STATE_FIELD_DESC = 
new org.apache.thrift.protocol.TField("state", 
org.apache.thrift.protocol.TType.I32, (short)1);
+  private static final org.apache.thrift.protocol.TField 
TASK_IDENTITY_FIELD_DESC = new 
org.apache.thrift.protocol.TField("taskIdentity", 
org.apache.thrift.protocol.TType.STRUCT, (short)2);
+
+  private static final Map<Class<? extends IScheme>, SchemeFactory> schemes = 
new HashMap<Class<? extends IScheme>, SchemeFactory>();
+  static {
+    schemes.put(StandardScheme.class, new 
TaskStatusChangeEventStandardSchemeFactory());
+    schemes.put(TupleScheme.class, new 
TaskStatusChangeEventTupleSchemeFactory());
+  }
+
+  /**
+   * 
+   * @see org.apache.airavata.model.status.TaskState
+   */
+  public org.apache.airavata.model.status.TaskState state; // required
+  public TaskIdentifier taskIdentity; // required
+
+  /** The set of fields this struct contains, along with convenience methods 
for finding and manipulating them. */
+  public enum _Fields implements org.apache.thrift.TFieldIdEnum {
+    /**
+     * 
+     * @see org.apache.airavata.model.status.TaskState
+     */
+    STATE((short)1, "state"),
+    TASK_IDENTITY((short)2, "taskIdentity");
+
+    private static final Map<String, _Fields> byName = new HashMap<String, 
_Fields>();
+
+    static {
+      for (_Fields field : EnumSet.allOf(_Fields.class)) {
+        byName.put(field.getFieldName(), field);
+      }
+    }
+
+    /**
+     * Find the _Fields constant that matches fieldId, or null if its not 
found.
+     */
+    public static _Fields findByThriftId(int fieldId) {
+      switch(fieldId) {
+        case 1: // STATE
+          return STATE;
+        case 2: // TASK_IDENTITY
+          return TASK_IDENTITY;
+        default:
+          return null;
+      }
+    }
+
+    /**
+     * Find the _Fields constant that matches fieldId, throwing an exception
+     * if it is not found.
+     */
+    public static _Fields findByThriftIdOrThrow(int fieldId) {
+      _Fields fields = findByThriftId(fieldId);
+      if (fields == null) throw new IllegalArgumentException("Field " + 
fieldId + " doesn't exist!");
+      return fields;
+    }
+
+    /**
+     * Find the _Fields constant that matches name, or null if its not found.
+     */
+    public static _Fields findByName(String name) {
+      return byName.get(name);
+    }
+
+    private final short _thriftId;
+    private final String _fieldName;
+
+    _Fields(short thriftId, String fieldName) {
+      _thriftId = thriftId;
+      _fieldName = fieldName;
+    }
+
+    public short getThriftFieldId() {
+      return _thriftId;
+    }
+
+    public String getFieldName() {
+      return _fieldName;
+    }
+  }
+
+  // isset id assignments
+  public static final Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> 
metaDataMap;
+  static {
+    Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> tmpMap = new 
EnumMap<_Fields, org.apache.thrift.meta_data.FieldMetaData>(_Fields.class);
+    tmpMap.put(_Fields.STATE, new 
org.apache.thrift.meta_data.FieldMetaData("state", 
org.apache.thrift.TFieldRequirementType.REQUIRED, 
+        new 
org.apache.thrift.meta_data.EnumMetaData(org.apache.thrift.protocol.TType.ENUM, 
org.apache.airavata.model.status.TaskState.class)));
+    tmpMap.put(_Fields.TASK_IDENTITY, new 
org.apache.thrift.meta_data.FieldMetaData("taskIdentity", 
org.apache.thrift.TFieldRequirementType.REQUIRED, 
+        new 
org.apache.thrift.meta_data.StructMetaData(org.apache.thrift.protocol.TType.STRUCT,
 TaskIdentifier.class)));
+    metaDataMap = Collections.unmodifiableMap(tmpMap);
+    
org.apache.thrift.meta_data.FieldMetaData.addStructMetaDataMap(TaskStatusChangeEvent.class,
 metaDataMap);
+  }
+
+  public TaskStatusChangeEvent() {
+  }
+
+  public TaskStatusChangeEvent(
+    org.apache.airavata.model.status.TaskState state,
+    TaskIdentifier taskIdentity)
+  {
+    this();
+    this.state = state;
+    this.taskIdentity = taskIdentity;
+  }
+
+  /**
+   * Performs a deep copy on <i>other</i>.
+   */
+  public TaskStatusChangeEvent(TaskStatusChangeEvent other) {
+    if (other.isSetState()) {
+      this.state = other.state;
+    }
+    if (other.isSetTaskIdentity()) {
+      this.taskIdentity = new TaskIdentifier(other.taskIdentity);
+    }
+  }
+
+  public TaskStatusChangeEvent deepCopy() {
+    return new TaskStatusChangeEvent(this);
+  }
+
+  @Override
+  public void clear() {
+    this.state = null;
+    this.taskIdentity = null;
+  }
+
+  /**
+   * 
+   * @see org.apache.airavata.model.status.TaskState
+   */
+  public org.apache.airavata.model.status.TaskState getState() {
+    return this.state;
+  }
+
+  /**
+   * 
+   * @see org.apache.airavata.model.status.TaskState
+   */
+  public TaskStatusChangeEvent 
setState(org.apache.airavata.model.status.TaskState state) {
+    this.state = state;
+    return this;
+  }
+
+  public void unsetState() {
+    this.state = null;
+  }
+
+  /** Returns true if field state is set (has been assigned a value) and false 
otherwise */
+  public boolean isSetState() {
+    return this.state != null;
+  }
+
+  public void setStateIsSet(boolean value) {
+    if (!value) {
+      this.state = null;
+    }
+  }
+
+  public TaskIdentifier getTaskIdentity() {
+    return this.taskIdentity;
+  }
+
+  public TaskStatusChangeEvent setTaskIdentity(TaskIdentifier taskIdentity) {
+    this.taskIdentity = taskIdentity;
+    return this;
+  }
+
+  public void unsetTaskIdentity() {
+    this.taskIdentity = null;
+  }
+
+  /** Returns true if field taskIdentity is set (has been assigned a value) 
and false otherwise */
+  public boolean isSetTaskIdentity() {
+    return this.taskIdentity != null;
+  }
+
+  public void setTaskIdentityIsSet(boolean value) {
+    if (!value) {
+      this.taskIdentity = null;
+    }
+  }
+
+  public void setFieldValue(_Fields field, Object value) {
+    switch (field) {
+    case STATE:
+      if (value == null) {
+        unsetState();
+      } else {
+        setState((org.apache.airavata.model.status.TaskState)value);
+      }
+      break;
+
+    case TASK_IDENTITY:
+      if (value == null) {
+        unsetTaskIdentity();
+      } else {
+        setTaskIdentity((TaskIdentifier)value);
+      }
+      break;
+
+    }
+  }
+
+  public Object getFieldValue(_Fields field) {
+    switch (field) {
+    case STATE:
+      return getState();
+
+    case TASK_IDENTITY:
+      return getTaskIdentity();
+
+    }
+    throw new IllegalStateException();
+  }
+
+  /** Returns true if field corresponding to fieldID is set (has been assigned 
a value) and false otherwise */
+  public boolean isSet(_Fields field) {
+    if (field == null) {
+      throw new IllegalArgumentException();
+    }
+
+    switch (field) {
+    case STATE:
+      return isSetState();
+    case TASK_IDENTITY:
+      return isSetTaskIdentity();
+    }
+    throw new IllegalStateException();
+  }
+
+  @Override
+  public boolean equals(Object that) {
+    if (that == null)
+      return false;
+    if (that instanceof TaskStatusChangeEvent)
+      return this.equals((TaskStatusChangeEvent)that);
+    return false;
+  }
+
+  public boolean equals(TaskStatusChangeEvent that) {
+    if (that == null)
+      return false;
+
+    boolean this_present_state = true && this.isSetState();
+    boolean that_present_state = true && that.isSetState();
+    if (this_present_state || that_present_state) {
+      if (!(this_present_state && that_present_state))
+        return false;
+      if (!this.state.equals(that.state))
+        return false;
+    }
+
+    boolean this_present_taskIdentity = true && this.isSetTaskIdentity();
+    boolean that_present_taskIdentity = true && that.isSetTaskIdentity();
+    if (this_present_taskIdentity || that_present_taskIdentity) {
+      if (!(this_present_taskIdentity && that_present_taskIdentity))
+        return false;
+      if (!this.taskIdentity.equals(that.taskIdentity))
+        return false;
+    }
+
+    return true;
+  }
+
+  @Override
+  public int hashCode() {
+    List<Object> list = new ArrayList<Object>();
+
+    boolean present_state = true && (isSetState());
+    list.add(present_state);
+    if (present_state)
+      list.add(state.getValue());
+
+    boolean present_taskIdentity = true && (isSetTaskIdentity());
+    list.add(present_taskIdentity);
+    if (present_taskIdentity)
+      list.add(taskIdentity);
+
+    return list.hashCode();
+  }
+
+  @Override
+  public int compareTo(TaskStatusChangeEvent other) {
+    if (!getClass().equals(other.getClass())) {
+      return getClass().getName().compareTo(other.getClass().getName());
+    }
+
+    int lastComparison = 0;
+
+    lastComparison = 
Boolean.valueOf(isSetState()).compareTo(other.isSetState());
+    if (lastComparison != 0) {
+      return lastComparison;
+    }
+    if (isSetState()) {
+      lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.state, 
other.state);
+      if (lastComparison != 0) {
+        return lastComparison;
+      }
+    }
+    lastComparison = 
Boolean.valueOf(isSetTaskIdentity()).compareTo(other.isSetTaskIdentity());
+    if (lastComparison != 0) {
+      return lastComparison;
+    }
+    if (isSetTaskIdentity()) {
+      lastComparison = 
org.apache.thrift.TBaseHelper.compareTo(this.taskIdentity, other.taskIdentity);
+      if (lastComparison != 0) {
+        return lastComparison;
+      }
+    }
+    return 0;
+  }
+
+  public _Fields fieldForId(int fieldId) {
+    return _Fields.findByThriftId(fieldId);
+  }
+
+  public void read(org.apache.thrift.protocol.TProtocol iprot) throws 
org.apache.thrift.TException {
+    schemes.get(iprot.getScheme()).getScheme().read(iprot, this);
+  }
+
+  public void write(org.apache.thrift.protocol.TProtocol oprot) throws 
org.apache.thrift.TException {
+    schemes.get(oprot.getScheme()).getScheme().write(oprot, this);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder("TaskStatusChangeEvent(");
+    boolean first = true;
+
+    sb.append("state:");
+    if (this.state == null) {
+      sb.append("null");
+    } else {
+      sb.append(this.state);
+    }
+    first = false;
+    if (!first) sb.append(", ");
+    sb.append("taskIdentity:");
+    if (this.taskIdentity == null) {
+      sb.append("null");
+    } else {
+      sb.append(this.taskIdentity);
+    }
+    first = false;
+    sb.append(")");
+    return sb.toString();
+  }
+
+  public void validate() throws org.apache.thrift.TException {
+    // check for required fields
+    if (state == null) {
+      throw new org.apache.thrift.protocol.TProtocolException("Required field 
'state' was not present! Struct: " + toString());
+    }
+    if (taskIdentity == null) {
+      throw new org.apache.thrift.protocol.TProtocolException("Required field 
'taskIdentity' was not present! Struct: " + toString());
+    }
+    // check for sub-struct validity
+    if (taskIdentity != null) {
+      taskIdentity.validate();
+    }
+  }
+
+  private void writeObject(java.io.ObjectOutputStream out) throws 
java.io.IOException {
+    try {
+      write(new org.apache.thrift.protocol.TCompactProtocol(new 
org.apache.thrift.transport.TIOStreamTransport(out)));
+    } catch (org.apache.thrift.TException te) {
+      throw new java.io.IOException(te);
+    }
+  }
+
+  private void readObject(java.io.ObjectInputStream in) throws 
java.io.IOException, ClassNotFoundException {
+    try {
+      read(new org.apache.thrift.protocol.TCompactProtocol(new 
org.apache.thrift.transport.TIOStreamTransport(in)));
+    } catch (org.apache.thrift.TException te) {
+      throw new java.io.IOException(te);
+    }
+  }
+
+  private static class TaskStatusChangeEventStandardSchemeFactory implements 
SchemeFactory {
+    public TaskStatusChangeEventStandardScheme getScheme() {
+      return new TaskStatusChangeEventStandardScheme();
+    }
+  }
+
+  private static class TaskStatusChangeEventStandardScheme extends 
StandardScheme<TaskStatusChangeEvent> {
+
+    public void read(org.apache.thrift.protocol.TProtocol iprot, 
TaskStatusChangeEvent struct) throws org.apache.thrift.TException {
+      org.apache.thrift.protocol.TField schemeField;
+      iprot.readStructBegin();
+      while (true)
+      {
+        schemeField = iprot.readFieldBegin();
+        if (schemeField.type == org.apache.thrift.protocol.TType.STOP) { 
+          break;
+        }
+        switch (schemeField.id) {
+          case 1: // STATE
+            if (schemeField.type == org.apache.thrift.protocol.TType.I32) {
+              struct.state = 
org.apache.airavata.model.status.TaskState.findByValue(iprot.readI32());
+              struct.setStateIsSet(true);
+            } else { 
+              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, 
schemeField.type);
+            }
+            break;
+          case 2: // TASK_IDENTITY
+            if (schemeField.type == org.apache.thrift.protocol.TType.STRUCT) {
+              struct.taskIdentity = new TaskIdentifier();
+              struct.taskIdentity.read(iprot);
+              struct.setTaskIdentityIsSet(true);
+            } else { 
+              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, 
schemeField.type);
+            }
+            break;
+          default:
+            org.apache.thrift.protocol.TProtocolUtil.skip(iprot, 
schemeField.type);
+        }
+        iprot.readFieldEnd();
+      }
+      iprot.readStructEnd();
+
+      // check for required fields of primitive type, which can't be checked 
in the validate method
+      struct.validate();
+    }
+
+    public void write(org.apache.thrift.protocol.TProtocol oprot, 
TaskStatusChangeEvent struct) throws org.apache.thrift.TException {
+      struct.validate();
+
+      oprot.writeStructBegin(STRUCT_DESC);
+      if (struct.state != null) {
+        oprot.writeFieldBegin(STATE_FIELD_DESC);
+        oprot.writeI32(struct.state.getValue());
+        oprot.writeFieldEnd();
+      }
+      if (struct.taskIdentity != null) {
+        oprot.writeFieldBegin(TASK_IDENTITY_FIELD_DESC);
+        struct.taskIdentity.write(oprot);
+        oprot.writeFieldEnd();
+      }
+      oprot.writeFieldStop();
+      oprot.writeStructEnd();
+    }
+
+  }
+
+  private static class TaskStatusChangeEventTupleSchemeFactory implements 
SchemeFactory {
+    public TaskStatusChangeEventTupleScheme getScheme() {
+      return new TaskStatusChangeEventTupleScheme();
+    }
+  }
+
+  private static class TaskStatusChangeEventTupleScheme extends 
TupleScheme<TaskStatusChangeEvent> {
+
+    @Override
+    public void write(org.apache.thrift.protocol.TProtocol prot, 
TaskStatusChangeEvent struct) throws org.apache.thrift.TException {
+      TTupleProtocol oprot = (TTupleProtocol) prot;
+      oprot.writeI32(struct.state.getValue());
+      struct.taskIdentity.write(oprot);
+    }
+
+    @Override
+    public void read(org.apache.thrift.protocol.TProtocol prot, 
TaskStatusChangeEvent struct) throws org.apache.thrift.TException {
+      TTupleProtocol iprot = (TTupleProtocol) prot;
+      struct.state = 
org.apache.airavata.model.status.TaskState.findByValue(iprot.readI32());
+      struct.setStateIsSet(true);
+      struct.taskIdentity = new TaskIdentifier();
+      struct.taskIdentity.read(iprot);
+      struct.setTaskIdentityIsSet(true);
+    }
+  }
+
+}
+

http://git-wip-us.apache.org/repos/asf/airavata/blob/25da582a/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskStatusChangeRequestEvent.java
----------------------------------------------------------------------
diff --git 
a/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskStatusChangeRequestEvent.java
 
b/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskStatusChangeRequestEvent.java
new file mode 100644
index 0000000..d880807
--- /dev/null
+++ 
b/airavata-api/airavata-api-stubs/src/main/java/org/apache/airavata/model/messaging/event/TaskStatusChangeRequestEvent.java
@@ -0,0 +1,530 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Autogenerated by Thrift Compiler (0.9.2)
+ *
+ * DO NOT EDIT UNLESS YOU ARE SURE THAT YOU KNOW WHAT YOU ARE DOING
+ *  @generated
+ */
+package org.apache.airavata.model.messaging.event;
+
+import org.apache.thrift.scheme.IScheme;
+import org.apache.thrift.scheme.SchemeFactory;
+import org.apache.thrift.scheme.StandardScheme;
+
+import org.apache.thrift.scheme.TupleScheme;
+import org.apache.thrift.protocol.TTupleProtocol;
+import org.apache.thrift.protocol.TProtocolException;
+import org.apache.thrift.EncodingUtils;
+import org.apache.thrift.TException;
+import org.apache.thrift.async.AsyncMethodCallback;
+import org.apache.thrift.server.AbstractNonblockingServer.*;
+import java.util.List;
+import java.util.ArrayList;
+import java.util.Map;
+import java.util.HashMap;
+import java.util.EnumMap;
+import java.util.Set;
+import java.util.HashSet;
+import java.util.EnumSet;
+import java.util.Collections;
+import java.util.BitSet;
+import java.nio.ByteBuffer;
+import java.util.Arrays;
+import javax.annotation.Generated;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+@SuppressWarnings({"cast", "rawtypes", "serial", "unchecked"})
+@Generated(value = "Autogenerated by Thrift Compiler (0.9.2)", date = 
"2015-12-2")
+public class TaskStatusChangeRequestEvent implements 
org.apache.thrift.TBase<TaskStatusChangeRequestEvent, 
TaskStatusChangeRequestEvent._Fields>, java.io.Serializable, Cloneable, 
Comparable<TaskStatusChangeRequestEvent> {
+  private static final org.apache.thrift.protocol.TStruct STRUCT_DESC = new 
org.apache.thrift.protocol.TStruct("TaskStatusChangeRequestEvent");
+
+  private static final org.apache.thrift.protocol.TField STATE_FIELD_DESC = 
new org.apache.thrift.protocol.TField("state", 
org.apache.thrift.protocol.TType.I32, (short)1);
+  private static final org.apache.thrift.protocol.TField 
TASK_IDENTITY_FIELD_DESC = new 
org.apache.thrift.protocol.TField("taskIdentity", 
org.apache.thrift.protocol.TType.STRUCT, (short)2);
+
+  private static final Map<Class<? extends IScheme>, SchemeFactory> schemes = 
new HashMap<Class<? extends IScheme>, SchemeFactory>();
+  static {
+    schemes.put(StandardScheme.class, new 
TaskStatusChangeRequestEventStandardSchemeFactory());
+    schemes.put(TupleScheme.class, new 
TaskStatusChangeRequestEventTupleSchemeFactory());
+  }
+
+  /**
+   * 
+   * @see org.apache.airavata.model.status.TaskState
+   */
+  public org.apache.airavata.model.status.TaskState state; // required
+  public TaskIdentifier taskIdentity; // required
+
+  /** The set of fields this struct contains, along with convenience methods 
for finding and manipulating them. */
+  public enum _Fields implements org.apache.thrift.TFieldIdEnum {
+    /**
+     * 
+     * @see org.apache.airavata.model.status.TaskState
+     */
+    STATE((short)1, "state"),
+    TASK_IDENTITY((short)2, "taskIdentity");
+
+    private static final Map<String, _Fields> byName = new HashMap<String, 
_Fields>();
+
+    static {
+      for (_Fields field : EnumSet.allOf(_Fields.class)) {
+        byName.put(field.getFieldName(), field);
+      }
+    }
+
+    /**
+     * Find the _Fields constant that matches fieldId, or null if its not 
found.
+     */
+    public static _Fields findByThriftId(int fieldId) {
+      switch(fieldId) {
+        case 1: // STATE
+          return STATE;
+        case 2: // TASK_IDENTITY
+          return TASK_IDENTITY;
+        default:
+          return null;
+      }
+    }
+
+    /**
+     * Find the _Fields constant that matches fieldId, throwing an exception
+     * if it is not found.
+     */
+    public static _Fields findByThriftIdOrThrow(int fieldId) {
+      _Fields fields = findByThriftId(fieldId);
+      if (fields == null) throw new IllegalArgumentException("Field " + 
fieldId + " doesn't exist!");
+      return fields;
+    }
+
+    /**
+     * Find the _Fields constant that matches name, or null if its not found.
+     */
+    public static _Fields findByName(String name) {
+      return byName.get(name);
+    }
+
+    private final short _thriftId;
+    private final String _fieldName;
+
+    _Fields(short thriftId, String fieldName) {
+      _thriftId = thriftId;
+      _fieldName = fieldName;
+    }
+
+    public short getThriftFieldId() {
+      return _thriftId;
+    }
+
+    public String getFieldName() {
+      return _fieldName;
+    }
+  }
+
+  // isset id assignments
+  public static final Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> 
metaDataMap;
+  static {
+    Map<_Fields, org.apache.thrift.meta_data.FieldMetaData> tmpMap = new 
EnumMap<_Fields, org.apache.thrift.meta_data.FieldMetaData>(_Fields.class);
+    tmpMap.put(_Fields.STATE, new 
org.apache.thrift.meta_data.FieldMetaData("state", 
org.apache.thrift.TFieldRequirementType.REQUIRED, 
+        new 
org.apache.thrift.meta_data.EnumMetaData(org.apache.thrift.protocol.TType.ENUM, 
org.apache.airavata.model.status.TaskState.class)));
+    tmpMap.put(_Fields.TASK_IDENTITY, new 
org.apache.thrift.meta_data.FieldMetaData("taskIdentity", 
org.apache.thrift.TFieldRequirementType.REQUIRED, 
+        new 
org.apache.thrift.meta_data.StructMetaData(org.apache.thrift.protocol.TType.STRUCT,
 TaskIdentifier.class)));
+    metaDataMap = Collections.unmodifiableMap(tmpMap);
+    
org.apache.thrift.meta_data.FieldMetaData.addStructMetaDataMap(TaskStatusChangeRequestEvent.class,
 metaDataMap);
+  }
+
+  public TaskStatusChangeRequestEvent() {
+  }
+
+  public TaskStatusChangeRequestEvent(
+    org.apache.airavata.model.status.TaskState state,
+    TaskIdentifier taskIdentity)
+  {
+    this();
+    this.state = state;
+    this.taskIdentity = taskIdentity;
+  }
+
+  /**
+   * Performs a deep copy on <i>other</i>.
+   */
+  public TaskStatusChangeRequestEvent(TaskStatusChangeRequestEvent other) {
+    if (other.isSetState()) {
+      this.state = other.state;
+    }
+    if (other.isSetTaskIdentity()) {
+      this.taskIdentity = new TaskIdentifier(other.taskIdentity);
+    }
+  }
+
+  public TaskStatusChangeRequestEvent deepCopy() {
+    return new TaskStatusChangeRequestEvent(this);
+  }
+
+  @Override
+  public void clear() {
+    this.state = null;
+    this.taskIdentity = null;
+  }
+
+  /**
+   * 
+   * @see org.apache.airavata.model.status.TaskState
+   */
+  public org.apache.airavata.model.status.TaskState getState() {
+    return this.state;
+  }
+
+  /**
+   * 
+   * @see org.apache.airavata.model.status.TaskState
+   */
+  public TaskStatusChangeRequestEvent 
setState(org.apache.airavata.model.status.TaskState state) {
+    this.state = state;
+    return this;
+  }
+
+  public void unsetState() {
+    this.state = null;
+  }
+
+  /** Returns true if field state is set (has been assigned a value) and false 
otherwise */
+  public boolean isSetState() {
+    return this.state != null;
+  }
+
+  public void setStateIsSet(boolean value) {
+    if (!value) {
+      this.state = null;
+    }
+  }
+
+  public TaskIdentifier getTaskIdentity() {
+    return this.taskIdentity;
+  }
+
+  public TaskStatusChangeRequestEvent setTaskIdentity(TaskIdentifier 
taskIdentity) {
+    this.taskIdentity = taskIdentity;
+    return this;
+  }
+
+  public void unsetTaskIdentity() {
+    this.taskIdentity = null;
+  }
+
+  /** Returns true if field taskIdentity is set (has been assigned a value) 
and false otherwise */
+  public boolean isSetTaskIdentity() {
+    return this.taskIdentity != null;
+  }
+
+  public void setTaskIdentityIsSet(boolean value) {
+    if (!value) {
+      this.taskIdentity = null;
+    }
+  }
+
+  public void setFieldValue(_Fields field, Object value) {
+    switch (field) {
+    case STATE:
+      if (value == null) {
+        unsetState();
+      } else {
+        setState((org.apache.airavata.model.status.TaskState)value);
+      }
+      break;
+
+    case TASK_IDENTITY:
+      if (value == null) {
+        unsetTaskIdentity();
+      } else {
+        setTaskIdentity((TaskIdentifier)value);
+      }
+      break;
+
+    }
+  }
+
+  public Object getFieldValue(_Fields field) {
+    switch (field) {
+    case STATE:
+      return getState();
+
+    case TASK_IDENTITY:
+      return getTaskIdentity();
+
+    }
+    throw new IllegalStateException();
+  }
+
+  /** Returns true if field corresponding to fieldID is set (has been assigned 
a value) and false otherwise */
+  public boolean isSet(_Fields field) {
+    if (field == null) {
+      throw new IllegalArgumentException();
+    }
+
+    switch (field) {
+    case STATE:
+      return isSetState();
+    case TASK_IDENTITY:
+      return isSetTaskIdentity();
+    }
+    throw new IllegalStateException();
+  }
+
+  @Override
+  public boolean equals(Object that) {
+    if (that == null)
+      return false;
+    if (that instanceof TaskStatusChangeRequestEvent)
+      return this.equals((TaskStatusChangeRequestEvent)that);
+    return false;
+  }
+
+  public boolean equals(TaskStatusChangeRequestEvent that) {
+    if (that == null)
+      return false;
+
+    boolean this_present_state = true && this.isSetState();
+    boolean that_present_state = true && that.isSetState();
+    if (this_present_state || that_present_state) {
+      if (!(this_present_state && that_present_state))
+        return false;
+      if (!this.state.equals(that.state))
+        return false;
+    }
+
+    boolean this_present_taskIdentity = true && this.isSetTaskIdentity();
+    boolean that_present_taskIdentity = true && that.isSetTaskIdentity();
+    if (this_present_taskIdentity || that_present_taskIdentity) {
+      if (!(this_present_taskIdentity && that_present_taskIdentity))
+        return false;
+      if (!this.taskIdentity.equals(that.taskIdentity))
+        return false;
+    }
+
+    return true;
+  }
+
+  @Override
+  public int hashCode() {
+    List<Object> list = new ArrayList<Object>();
+
+    boolean present_state = true && (isSetState());
+    list.add(present_state);
+    if (present_state)
+      list.add(state.getValue());
+
+    boolean present_taskIdentity = true && (isSetTaskIdentity());
+    list.add(present_taskIdentity);
+    if (present_taskIdentity)
+      list.add(taskIdentity);
+
+    return list.hashCode();
+  }
+
+  @Override
+  public int compareTo(TaskStatusChangeRequestEvent other) {
+    if (!getClass().equals(other.getClass())) {
+      return getClass().getName().compareTo(other.getClass().getName());
+    }
+
+    int lastComparison = 0;
+
+    lastComparison = 
Boolean.valueOf(isSetState()).compareTo(other.isSetState());
+    if (lastComparison != 0) {
+      return lastComparison;
+    }
+    if (isSetState()) {
+      lastComparison = org.apache.thrift.TBaseHelper.compareTo(this.state, 
other.state);
+      if (lastComparison != 0) {
+        return lastComparison;
+      }
+    }
+    lastComparison = 
Boolean.valueOf(isSetTaskIdentity()).compareTo(other.isSetTaskIdentity());
+    if (lastComparison != 0) {
+      return lastComparison;
+    }
+    if (isSetTaskIdentity()) {
+      lastComparison = 
org.apache.thrift.TBaseHelper.compareTo(this.taskIdentity, other.taskIdentity);
+      if (lastComparison != 0) {
+        return lastComparison;
+      }
+    }
+    return 0;
+  }
+
+  public _Fields fieldForId(int fieldId) {
+    return _Fields.findByThriftId(fieldId);
+  }
+
+  public void read(org.apache.thrift.protocol.TProtocol iprot) throws 
org.apache.thrift.TException {
+    schemes.get(iprot.getScheme()).getScheme().read(iprot, this);
+  }
+
+  public void write(org.apache.thrift.protocol.TProtocol oprot) throws 
org.apache.thrift.TException {
+    schemes.get(oprot.getScheme()).getScheme().write(oprot, this);
+  }
+
+  @Override
+  public String toString() {
+    StringBuilder sb = new StringBuilder("TaskStatusChangeRequestEvent(");
+    boolean first = true;
+
+    sb.append("state:");
+    if (this.state == null) {
+      sb.append("null");
+    } else {
+      sb.append(this.state);
+    }
+    first = false;
+    if (!first) sb.append(", ");
+    sb.append("taskIdentity:");
+    if (this.taskIdentity == null) {
+      sb.append("null");
+    } else {
+      sb.append(this.taskIdentity);
+    }
+    first = false;
+    sb.append(")");
+    return sb.toString();
+  }
+
+  public void validate() throws org.apache.thrift.TException {
+    // check for required fields
+    if (state == null) {
+      throw new org.apache.thrift.protocol.TProtocolException("Required field 
'state' was not present! Struct: " + toString());
+    }
+    if (taskIdentity == null) {
+      throw new org.apache.thrift.protocol.TProtocolException("Required field 
'taskIdentity' was not present! Struct: " + toString());
+    }
+    // check for sub-struct validity
+    if (taskIdentity != null) {
+      taskIdentity.validate();
+    }
+  }
+
+  private void writeObject(java.io.ObjectOutputStream out) throws 
java.io.IOException {
+    try {
+      write(new org.apache.thrift.protocol.TCompactProtocol(new 
org.apache.thrift.transport.TIOStreamTransport(out)));
+    } catch (org.apache.thrift.TException te) {
+      throw new java.io.IOException(te);
+    }
+  }
+
+  private void readObject(java.io.ObjectInputStream in) throws 
java.io.IOException, ClassNotFoundException {
+    try {
+      read(new org.apache.thrift.protocol.TCompactProtocol(new 
org.apache.thrift.transport.TIOStreamTransport(in)));
+    } catch (org.apache.thrift.TException te) {
+      throw new java.io.IOException(te);
+    }
+  }
+
+  private static class TaskStatusChangeRequestEventStandardSchemeFactory 
implements SchemeFactory {
+    public TaskStatusChangeRequestEventStandardScheme getScheme() {
+      return new TaskStatusChangeRequestEventStandardScheme();
+    }
+  }
+
+  private static class TaskStatusChangeRequestEventStandardScheme extends 
StandardScheme<TaskStatusChangeRequestEvent> {
+
+    public void read(org.apache.thrift.protocol.TProtocol iprot, 
TaskStatusChangeRequestEvent struct) throws org.apache.thrift.TException {
+      org.apache.thrift.protocol.TField schemeField;
+      iprot.readStructBegin();
+      while (true)
+      {
+        schemeField = iprot.readFieldBegin();
+        if (schemeField.type == org.apache.thrift.protocol.TType.STOP) { 
+          break;
+        }
+        switch (schemeField.id) {
+          case 1: // STATE
+            if (schemeField.type == org.apache.thrift.protocol.TType.I32) {
+              struct.state = 
org.apache.airavata.model.status.TaskState.findByValue(iprot.readI32());
+              struct.setStateIsSet(true);
+            } else { 
+              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, 
schemeField.type);
+            }
+            break;
+          case 2: // TASK_IDENTITY
+            if (schemeField.type == org.apache.thrift.protocol.TType.STRUCT) {
+              struct.taskIdentity = new TaskIdentifier();
+              struct.taskIdentity.read(iprot);
+              struct.setTaskIdentityIsSet(true);
+            } else { 
+              org.apache.thrift.protocol.TProtocolUtil.skip(iprot, 
schemeField.type);
+            }
+            break;
+          default:
+            org.apache.thrift.protocol.TProtocolUtil.skip(iprot, 
schemeField.type);
+        }
+        iprot.readFieldEnd();
+      }
+      iprot.readStructEnd();
+
+      // check for required fields of primitive type, which can't be checked 
in the validate method
+      struct.validate();
+    }
+
+    public void write(org.apache.thrift.protocol.TProtocol oprot, 
TaskStatusChangeRequestEvent struct) throws org.apache.thrift.TException {
+      struct.validate();
+
+      oprot.writeStructBegin(STRUCT_DESC);
+      if (struct.state != null) {
+        oprot.writeFieldBegin(STATE_FIELD_DESC);
+        oprot.writeI32(struct.state.getValue());
+        oprot.writeFieldEnd();
+      }
+      if (struct.taskIdentity != null) {
+        oprot.writeFieldBegin(TASK_IDENTITY_FIELD_DESC);
+        struct.taskIdentity.write(oprot);
+        oprot.writeFieldEnd();
+      }
+      oprot.writeFieldStop();
+      oprot.writeStructEnd();
+    }
+
+  }
+
+  private static class TaskStatusChangeRequestEventTupleSchemeFactory 
implements SchemeFactory {
+    public TaskStatusChangeRequestEventTupleScheme getScheme() {
+      return new TaskStatusChangeRequestEventTupleScheme();
+    }
+  }
+
+  private static class TaskStatusChangeRequestEventTupleScheme extends 
TupleScheme<TaskStatusChangeRequestEvent> {
+
+    @Override
+    public void write(org.apache.thrift.protocol.TProtocol prot, 
TaskStatusChangeRequestEvent struct) throws org.apache.thrift.TException {
+      TTupleProtocol oprot = (TTupleProtocol) prot;
+      oprot.writeI32(struct.state.getValue());
+      struct.taskIdentity.write(oprot);
+    }
+
+    @Override
+    public void read(org.apache.thrift.protocol.TProtocol prot, 
TaskStatusChangeRequestEvent struct) throws org.apache.thrift.TException {
+      TTupleProtocol iprot = (TTupleProtocol) prot;
+      struct.state = 
org.apache.airavata.model.status.TaskState.findByValue(iprot.readI32());
+      struct.setStateIsSet(true);
+      struct.taskIdentity = new TaskIdentifier();
+      struct.taskIdentity.read(iprot);
+      struct.setTaskIdentityIsSet(true);
+    }
+  }
+
+}
+

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