diff options
Diffstat (limited to 'trunk/qpid/java/broker/src/main/java/org/apache/qpid/server/util/LoggingProxy.java')
-rw-r--r-- | trunk/qpid/java/broker/src/main/java/org/apache/qpid/server/util/LoggingProxy.java | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/trunk/qpid/java/broker/src/main/java/org/apache/qpid/server/util/LoggingProxy.java b/trunk/qpid/java/broker/src/main/java/org/apache/qpid/server/util/LoggingProxy.java new file mode 100644 index 0000000000..eda97e0ed2 --- /dev/null +++ b/trunk/qpid/java/broker/src/main/java/org/apache/qpid/server/util/LoggingProxy.java @@ -0,0 +1,105 @@ +/* + * + * 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.qpid.server.util; + +import java.lang.reflect.InvocationHandler; +import java.lang.reflect.InvocationTargetException; +import java.lang.reflect.Method; +import java.lang.reflect.Proxy; +import java.util.Arrays; + +/** + * Dynamic proxy that records invocations in a fixed size circular buffer, + * dumping details on hitting an exception. + * <p> + * Useful in debugging. + * <p> + */ +public class LoggingProxy implements InvocationHandler +{ + private final Object _target; + private final CircularBuffer _log; + + public LoggingProxy(Object target, int size) + { + _target = target; + _log = new CircularBuffer(size); + } + + public Object invoke(Object proxy, Method method, Object[] args) throws Throwable + { + try + { + entered(method, args); + Object result = method.invoke(_target, args); + returned(method, result); + return result; + } + catch(InvocationTargetException e) + { + dump(); + throw e.getTargetException(); + } + } + + void dump() + { + _log.dump(); + } + + CircularBuffer getBuffer() + { + return _log; + } + + private synchronized void entered(Method method, Object[] args) + { + if (args == null) + { + _log.add(Thread.currentThread() + ": " + method.getName() + "() entered"); + } + else + { + _log.add(Thread.currentThread() + ": " + method.getName() + "(" + Arrays.toString(args) + ") entered"); + } + } + + private synchronized void returned(Method method, Object result) + { + if (method.getReturnType() == Void.TYPE) + { + _log.add(Thread.currentThread() + ": " + method.getName() + "() returned"); + } + else + { + _log.add(Thread.currentThread() + ": " + method.getName() + "() returned " + result); + } + } + + public Object getProxy(Class... c) + { + return Proxy.newProxyInstance(_target.getClass().getClassLoader(), c, this); + } + + public int getBufferSize() { + return _log.size(); + } +} |