Github user markap14 commented on a diff in the pull request:
https://github.com/apache/nifi/pull/185#discussion_r50852398
--- Diff:
nifi-nar-bundles/nifi-scripting-bundle/nifi-scripting-processors/src/main/java/org/apache/nifi/processors/script/InvokeScriptProcessor.java
---
@@ -0,0 +1,862 @@
+/*
+ * 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.
+ */
+package org.apache.nifi.processors.script;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.nifi.annotation.behavior.DynamicProperty;
+import org.apache.nifi.annotation.documentation.CapabilityDescription;
+import org.apache.nifi.annotation.documentation.SeeAlso;
+import org.apache.nifi.annotation.documentation.Tags;
+import org.apache.nifi.annotation.lifecycle.OnScheduled;
+import org.apache.nifi.components.AllowableValue;
+import org.apache.nifi.components.PropertyDescriptor;
+import org.apache.nifi.components.ValidationContext;
+import org.apache.nifi.components.ValidationResult;
+import org.apache.nifi.components.Validator;
+import org.apache.nifi.controller.ControllerServiceLookup;
+import org.apache.nifi.expression.AttributeExpression;
+import org.apache.nifi.logging.ProcessorLog;
+import org.apache.nifi.processor.AbstractSessionFactoryProcessor;
+import org.apache.nifi.processor.ProcessContext;
+import org.apache.nifi.processor.ProcessSessionFactory;
+import org.apache.nifi.processor.Processor;
+import org.apache.nifi.processor.ProcessorInitializationContext;
+import org.apache.nifi.processor.Relationship;
+import org.apache.nifi.processor.exception.ProcessException;
+import org.apache.nifi.processor.util.StandardValidators;
+import org.apache.nifi.stream.io.ByteArrayInputStream;
+import org.apache.nifi.util.file.monitor.LastModifiedMonitor;
+import org.apache.nifi.util.file.monitor.SynchronousFileWatcher;
+
+import javax.script.Invocable;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineFactory;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.net.MalformedURLException;
+import java.net.URL;
+import java.net.URLClassLoader;
+import java.nio.file.Files;
+import java.nio.file.Paths;
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.Collections;
+import java.util.Comparator;
+import java.util.HashMap;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.ServiceLoader;
+import java.util.Set;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+import java.util.concurrent.locks.Lock;
+import java.util.concurrent.locks.ReentrantLock;
+
+@Tags({"script", "invoke", "groovy", "python", "jython", "jruby", "ruby",
"javascript", "js", "lua", "luaj", "scala"})
+@CapabilityDescription("Invokes a script engine for a Processor defined in
the given script. The script must define "
++ "a valid class that implements the Processor interface, and it must set
a variable 'processor' to an instance of "
++ "the class. Processor methods such as onTrigger() will be delegated to
the scripted Processor instance. Also any "
++ "Relationships or PropertyDescriptors defined by the scripted processor
will be added to the configuration dialog.")
+@DynamicProperty(name = "A script engine property to update", value = "The
value to set it to", supportsExpressionLanguage = true,
+ description = "Updates a script engine property specified by the
Dynamic Property's key with the value specified by the Dynamic Property's
value")
+@SeeAlso({ExecuteScript.class})
+public class InvokeScriptProcessor extends AbstractSessionFactoryProcessor
{
+
+ public static final Relationship REL_SUCCESS = new
Relationship.Builder()
+ .name("success")
+ .description("FlowFiles that were successfully processed")
+ .build();
+
+ public static final Relationship REL_FAILURE = new
Relationship.Builder()
+ .name("failure")
+ .description("FlowFiles that were failed to process")
+ .build();
+
+
+ public static PropertyDescriptor SCRIPT_ENGINE;
+
+ public static final PropertyDescriptor SCRIPT_FILE = new
PropertyDescriptor.Builder()
+ .name("Script File")
+ .required(false)
+ .description("Path to script file to execute. Use either file
or body not both")
+ .addValidator(new StandardValidators.FileExistsValidator(true))
+ .expressionLanguageSupported(true)
+ .build();
+
+ public static final PropertyDescriptor SCRIPT_BODY = new
PropertyDescriptor.Builder()
+ .name("Script Body")
+ .required(false)
+ .description("Body to script to execute. Use either file or
body not both")
+ .addValidator(Validator.VALID)
+ .expressionLanguageSupported(true)
+ .build();
+
+
+ public static final PropertyDescriptor SCRIPT_ARGS = new
PropertyDescriptor.Builder()
+ .name("Arguments")
+ .required(false)
+ .description("Arguments to pass to scripting engine")
+ .addValidator(Validator.VALID)
+ .expressionLanguageSupported(true)
+ .defaultValue("")
+ .build();
+
+ public static final PropertyDescriptor MODULES = new
PropertyDescriptor.Builder()
+ .name("Module Directory")
+ .description("Path to a directory which contains modules
required by the script.")
+ .required(false)
+ .expressionLanguageSupported(true)
+ .addValidator(new
StandardValidators.DirectoryExistsValidator(true, false))
+ .build();
+
+ // A map from engine name to a custom configurator for that engine
+ private final Map<String, ScriptEngineConfigurator>
scriptEngineConfiguratorMap = new ConcurrentHashMap<>();
+
+ private final AtomicReference<Processor> processor = new
AtomicReference<>();
+ private final AtomicReference<Collection<ValidationResult>>
validationResults =
+ new AtomicReference(Collections.EMPTY_LIST);
+
+ private ControllerServiceLookup controllerServiceLookup;
+ private String initializationContextId;
+
+ private final AtomicBoolean isInitialized = new AtomicBoolean(false);
+ private final Lock lock = new ReentrantLock();
+ private SynchronousFileWatcher scriptWatcher;
+
+ private Map<String, ScriptEngineFactory> scriptEngineFactoryMap;
+ private ScriptEngineManager scriptEngineManager;
+ private ScriptEngine scriptEngine;
+ private String scriptEngineName;
+ private String scriptPath;
+ private String modulePath;
+ private String scriptBody;
+
+ private ScheduledExecutorService reloadService = null;
+
+ private List<PropertyDescriptor> descriptors;
+
+ /**
+ * Initializes this processor
+ *
+ * @param context in which to perform initialization
+ */
+ @Override
+ protected void init(final ProcessorInitializationContext context) {
+ initializationContextId = context.getIdentifier();
--- End diff --
Would recommend removing this method and not caching these values here -
they are already available via the superclass by calling getIdentifier() and
getControllerServiceLookup()
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