org.apache.camel.component.direct.DirectConsumer Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of camel-core Show documentation
Show all versions of camel-core Show documentation
The Core Camel Java DSL based router
/**
* 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.component.direct;
import org.apache.camel.Endpoint;
import org.apache.camel.Processor;
import org.apache.camel.ShutdownRunningTask;
import org.apache.camel.SuspendableService;
import org.apache.camel.impl.DefaultConsumer;
import org.apache.camel.spi.ShutdownAware;
/**
* The direct consumer.
*
* @version
*/
public class DirectConsumer extends DefaultConsumer implements ShutdownAware, SuspendableService {
private DirectEndpoint endpoint;
public DirectConsumer(Endpoint endpoint, Processor processor) {
super(endpoint, processor);
this.endpoint = (DirectEndpoint) endpoint;
}
@Override
public DirectEndpoint getEndpoint() {
return (DirectEndpoint) super.getEndpoint();
}
@Override
protected void doStart() throws Exception {
// add consumer to endpoint
boolean existing = this == endpoint.getConsumer();
if (!existing && endpoint.hasConsumer(this)) {
throw new IllegalArgumentException("Cannot add a 2nd consumer to the same endpoint. Endpoint " + endpoint + " only allows one consumer.");
}
if (!existing) {
endpoint.addConsumer(this);
}
}
@Override
protected void doStop() throws Exception {
endpoint.removeConsumer(this);
}
@Override
protected void doSuspend() throws Exception {
endpoint.removeConsumer(this);
}
@Override
protected void doResume() throws Exception {
// resume by using the start logic
doStart();
}
public boolean deferShutdown(ShutdownRunningTask shutdownRunningTask) {
// deny stopping on shutdown as we want direct consumers to run in case some other queues
// depend on this consumer to run, so it can complete its exchanges
return true;
}
public int getPendingExchangesSize() {
// return 0 as we do not have an internal memory queue with a variable size
// of inflight messages.
return 0;
}
public void prepareShutdown(boolean suspendOnly, boolean forced) {
// noop
}
}