/*
* 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;
import org.apache.synapse.ManagedLifecycle;
import org.apache.synapse.Mediator;
import org.apache.synapse.MessageContext;
import org.apache.synapse.SynapseLog;
import org.apache.synapse.core.SynapseEnvironment;
import java.util.ArrayList;
import java.util.List;
/**
* This is the base class for all List mediators
*
* @see ListMediator
*/
public abstract class AbstractListMediator extends AbstractMediator
implements ListMediator {
/** the list of child mediators held. These are executed sequentially */
protected final List<Mediator> mediators = new ArrayList<Mediator>();
public boolean mediate(MessageContext synCtx) {
int parentsEffectiveTraceState = synCtx.getTracingState();
// if I have been explicitly asked to enable or disable tracing, set it to the message
// to pass it on; else, do nothing -> i.e. let the parents state flow
setEffectiveTraceState(synCtx);
int myEffectiveTraceState = synCtx.getTracingState();
try {
SynapseLog synLog = getLog(synCtx);
if (synLog.isTraceOrDebugEnabled()) {
synLog.traceOrDebug("Sequence <" + getType() + "> :: mediate()");
}
for (Mediator mediator : mediators) {
// ensure correct trace state after each invocation of a mediator
synCtx.setTracingState(myEffectiveTraceState);
if (!mediator.mediate(synCtx)) {
return false;
}
}
} finally {
synCtx.setTracingState(parentsEffectiveTraceState);
}
return true;
}
public List<Mediator> getList() {
return mediators;
}
public boolean addChild(Mediator m) {
return mediators.add(m);
}
public boolean addAll(List<Mediator> c) {
return mediators.addAll(c);
}
public Mediator getChild(int pos) {
return mediators.get(pos);
}
public boolean removeChild(Mediator m) {
return mediators.remove(m);
}
public Mediator removeChild(int pos) {
return mediators.remove(pos);
}
/**
* Initialize child mediators recursively
* @param se synapse environment
*/
public void init(SynapseEnvironment se) {
if (log.isDebugEnabled()) {
log.debug("Initializing child mediators of mediator : " + getType());
}
for (Mediator mediator : mediators) {
if (mediator instanceof ManagedLifecycle) {
((ManagedLifecycle) mediator).init(se);
}
}
}
/**
* Destroy child mediators recursively
*/
public void destroy() {
if (log.isDebugEnabled()) {
log.debug("Destroying child mediators of mediator : " + getType());
}
for (Mediator mediator : mediators) {
if (mediator instanceof ManagedLifecycle) {
((ManagedLifecycle) mediator).destroy();
}
}
}
}