Author: ozzy
Date: Tue Nov 17 13:25:02 2009
New Revision: 881273
URL: http://svn.apache.org/viewvc?rev=881273&view=rev
Log:
ARIES-47 Adding interceptor support
Added:
incubator/aries/trunk/blueprint/blueprint-core/src/main/java/org/apache/aries/blueprint/Interceptor.java
Added:
incubator/aries/trunk/blueprint/blueprint-core/src/main/java/org/apache/aries/blueprint/Interceptor.java
URL:
http://svn.apache.org/viewvc/incubator/aries/trunk/blueprint/blueprint-core/src/main/java/org/apache/aries/blueprint/Interceptor.java?rev=881273&view=auto
==============================================================================
---
incubator/aries/trunk/blueprint/blueprint-core/src/main/java/org/apache/aries/blueprint/Interceptor.java
(added)
+++
incubator/aries/trunk/blueprint/blueprint-core/src/main/java/org/apache/aries/blueprint/Interceptor.java
Tue Nov 17 13:25:02 2009
@@ -0,0 +1,68 @@
+/*
+ * 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.aries.blueprint;
+
+import java.lang.reflect.Method;
+
+import org.osgi.service.blueprint.reflect.ComponentMetadata;
+
+/**
+ * An Interceptor interface provides support for custom interceptor
implementation.
+ */
+public interface Interceptor {
+ /**
+ * This is called just before the method m is invocation.
+ * @param cm : the component's metada
+ * @param m: the method to be invoked
+ * @param parameters: method parameters
+ * @return token which will subsequently be passed to postCall
+ * @throws Throwable
+ */
+ public Object preCall(ComponentMetadata cm, Method m, Object...
parameters) throws Throwable;
+
+ /**
+ * This method is called after the method m is invoked and returned
normally.
+ * @param cm: the component metadata
+ * @param m: the method invoked
+ * @param returnType : the return object
+ * @param preCallToken token returned by preCall
+ * @throws Throwable
+ */
+ public void postCallWithReturn(ComponentMetadata cm, Method m, Object
returnType, Object preCallToken) throws Throwable;
+
+ /**
+ * The method is called after the method m is invoked and causes an
exception.
+ * @param cm : the component metadata
+ * @param m : the method invoked
+ * @param ex : the exception thrown
+ * @param preCallToken token returned by preCall
+ * @throws Throwable
+ */
+ public void postCallWithException(ComponentMetadata cm, Method m,
Exception ex, Object preCallToken) throws Throwable;
+
+
+ /**
+ * Return the rank of the interceptor, which is used to determine the
order of the interceptors to be invoked
+ * Rank is between Integer.MIN_VALUE and Integer.MAX_VALUE, interceptors
are called in the order of highest value
+ * rank first to lowest value rank last i.e. an interceptor with rank
Integer.MAX_VALUE will be called before
+ * all others (except of the same rank).
+ * @return the rank of the interceptor
+ */
+ public int getRank();
+}
