/*
* 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.synapse.mediators.base;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.synapse.Constants;
import org.apache.synapse.Mediator;
import org.apache.synapse.MessageContext;
import org.apache.synapse.SynapseException;
import org.apache.synapse.core.axis2.Axis2MessageContext;
import org.apache.synapse.mediators.AbstractListMediator;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
/**
* This is a ListMediator which is similar to a Java try-catch-finally but with a catch-all
* <p/>
* If any of the child mediators throws an exception during execution, this mediator
* invokes the specified error handler sequence
*/
public class TryMediator extends AbstractListMediator {
private static final Log log = LogFactory.getLog(TryMediator.class);
private static final Log trace = LogFactory.getLog(Constants.TRACE_LOGGER);
private List errorHandlerMediators = new ArrayList();
private List finallyMediators = new ArrayList();
public boolean mediate(MessageContext synCtx) {
log.debug("Try mediator :: mediate()");
boolean shouldTrace = shouldTrace(synCtx.getTracingState());
try {
if (shouldTrace) {
trace.trace("Start : Try Mediator");
}
return super.mediate(synCtx);
} catch (SynapseException e) {
try {
if (shouldTrace) {
trace.trace("Encountered an exception, executing the 'onError' mediators");
}
// set exception information to message context
Axis2MessageContext.setErrorInformation(synCtx, e);
saveAndSetTraceState(synCtx);
Iterator it = errorHandlerMediators.iterator();
while (it.hasNext()) {
Mediator m = (Mediator) it.next();
if (!m.mediate(synCtx)) {
return false;
}
}
} finally {
restoreTracingState(synCtx);
if (shouldTrace) {
trace.trace("End executing 'onError' mediators");
}
}
} finally {
try {
if (shouldTrace) {
trace.trace("Encountered an exception, executing the 'finally' mediators");
}
saveAndSetTraceState(synCtx);
Iterator it = finallyMediators.iterator();
while (it.hasNext()) {
Mediator m = (Mediator) it.next();
if (!m.mediate(synCtx)) {
return false;
}
}
} finally {
restoreTracingState(synCtx);
if (shouldTrace) {
trace.trace("End executing 'finally' mediators");
}
}
if (shouldTrace) {
trace.trace("End : Try mediator");
}
}
return true;
}
public List getErrorHandlerMediators() {
return errorHandlerMediators;
}
public void setErrorHandlerMediators(List errorHandlerMediators) {
this.errorHandlerMediators = errorHandlerMediators;
}
public List getFinallyMediators() {
return finallyMediators;
}
public void setFinallyMediators(List finallyMediators) {
this.finallyMediators = finallyMediators;
}
}