/**
* 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.camel.processor;
import java.util.List;
import org.apache.camel.AsyncCallback;
import org.apache.camel.CamelContext;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.Route;
import org.apache.camel.StatefulService;
import org.apache.camel.spi.RoutePolicy;
import org.apache.camel.support.SynchronizationAdapter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* {@link Processor} which instruments the {@link RoutePolicy}.
*
* @version
*/
public class RoutePolicyProcessor extends DelegateAsyncProcessor {
private static final Logger LOG = LoggerFactory.getLogger(RoutePolicyProcessor.class);
private final List<RoutePolicy> routePolicies;
private Route route;
public RoutePolicyProcessor(Processor processor, List<RoutePolicy> routePolicies) {
super(processor);
this.routePolicies = routePolicies;
}
@Override
public String toString() {
return "RoutePolicy[" + routePolicies + "]";
}
@Override
public boolean process(Exchange exchange, AsyncCallback callback) {
// invoke begin
for (RoutePolicy policy : routePolicies) {
try {
if (isRoutePolicyRunAllowed(policy)) {
policy.onExchangeBegin(route, exchange);
}
} catch (Exception e) {
LOG.warn("Error occurred during onExchangeBegin on RoutePolicy: " + policy
+ ". This exception will be ignored", e);
}
}
// add on completion that invokes the policy callback on complete
// as the Exchange can be routed async and thus we need the callback to
// invoke when the route is completed
exchange.addOnCompletion(new SynchronizationAdapter() {
@Override
public void onDone(Exchange exchange) {
// do not invoke it if Camel is stopping as we don't want
// the policy to start a consumer during Camel is stopping
if (isCamelStopping(exchange.getContext())) {
return;
}
for (RoutePolicy policy : routePolicies) {
try {
if (isRoutePolicyRunAllowed(policy)) {
policy.onExchangeDone(route, exchange);
}
} catch (Exception e) {
LOG.warn("Error occurred during onExchangeDone on RoutePolicy: " + policy
+ ". This exception will be ignored", e);
}
}
}
@Override
public String toString() {
return "RoutePolicyOnCompletion";
}
});
return super.process(exchange, callback);
}
/**
* Sets the route this policy applies.
*
* @param route the route
*/
public void setRoute(Route route) {
this.route = route;
}
/**
* Strategy to determine if this policy is allowed to run
*
* @param policy the policy
* @return <tt>true</tt> to run
*/
protected boolean isRoutePolicyRunAllowed(RoutePolicy policy) {
if (policy instanceof StatefulService) {
StatefulService ss = (StatefulService) policy;
return ss.isRunAllowed();
}
return true;
}
private static boolean isCamelStopping(CamelContext context) {
if (context instanceof StatefulService) {
StatefulService ss = (StatefulService) context;
return ss.isStopping() || ss.isStopped();
}
return false;
}
}