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DirectEndpoint.java
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DirectEndpoint.java
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/**
* 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 java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import org.apache.camel.Component;
import org.apache.camel.Consumer;
import org.apache.camel.Processor;
import org.apache.camel.Producer;
import org.apache.camel.spi.Metadata;
import org.apache.camel.spi.UriEndpoint;
import org.apache.camel.spi.UriParam;
import org.apache.camel.spi.UriPath;
import org.apache.camel.support.DefaultEndpoint;
import org.apache.camel.util.StopWatch;
import org.apache.camel.util.StringHelper;
/**
* The direct component provides direct, synchronous call to another endpoint from the same CamelContext.
*
* This endpoint can be used to connect existing routes in the same CamelContext.
*/
@UriEndpoint(firstVersion = "1.0.0", scheme = "direct", title = "Direct", syntax = "direct:name", consumerClass = DirectConsumer.class, label = "core,endpoint")
public class DirectEndpoint extends DefaultEndpoint {
private final Map<String, DirectConsumer> consumers;
private final List<DirectProducer> producers = new ArrayList<>();
@UriPath(description = "Name of direct endpoint") @Metadata(required = true)
private String name;
@UriParam(label = "producer", defaultValue = "true")
private boolean block = true;
@UriParam(label = "producer", defaultValue = "30000")
private long timeout = 30000L;
@UriParam(label = "producer")
private boolean failIfNoConsumers = true;
public DirectEndpoint() {
this.consumers = new HashMap<>();
}
public DirectEndpoint(String endpointUri, Component component) {
this(endpointUri, component, new HashMap<>());
}
public DirectEndpoint(String uri, Component component, Map<String, DirectConsumer> consumers) {
super(uri, component);
this.consumers = consumers;
}
public Producer createProducer() throws Exception {
return new DirectProducer(this);
}
public Consumer createConsumer(Processor processor) throws Exception {
Consumer answer = new DirectConsumer(this, processor);
configureConsumer(answer);
return answer;
}
public boolean isSingleton() {
return true;
}
public void addConsumer(DirectConsumer consumer) {
String key = getKey();
synchronized (consumers) {
if (consumers.putIfAbsent(key, consumer) != null) {
throw new IllegalArgumentException("Cannot add a 2nd consumer to the same endpoint. Endpoint " + this + " only allows one consumer.");
}
consumers.notifyAll();
}
}
public void removeConsumer(DirectConsumer consumer) {
String key = getKey();
synchronized (consumers) {
consumers.remove(key, consumer);
consumers.notifyAll();
}
}
public void addProducer(DirectProducer producer) {
synchronized (consumers) {
producers.add(producer);
}
}
public void removeProducer(DirectProducer producer) {
synchronized (consumers) {
producers.remove(producer);
}
}
protected DirectConsumer getConsumer() throws InterruptedException {
String key = getKey();
synchronized (consumers) {
DirectConsumer answer = consumers.get(key);
if (answer == null && block) {
StopWatch watch = new StopWatch();
for (;;) {
answer = consumers.get(key);
if (answer != null) {
break;
}
long rem = timeout - watch.taken();
if (rem <= 0) {
break;
}
consumers.wait(rem);
}
}
// if (answer != null && answer.getEndpoint() != this) {
// throw new IllegalStateException();
// }
return answer;
}
}
public boolean isBlock() {
return block;
}
/**
* If sending a message to a direct endpoint which has no active consumer,
* then we can tell the producer to block and wait for the consumer to become active.
*/
public void setBlock(boolean block) {
this.block = block;
}
public long getTimeout() {
return timeout;
}
/**
* The timeout value to use if block is enabled.
*
* @param timeout the timeout value
*/
public void setTimeout(long timeout) {
this.timeout = timeout;
}
public boolean isFailIfNoConsumers() {
return failIfNoConsumers;
}
/**
* Whether the producer should fail by throwing an exception, when sending to a DIRECT endpoint with no active consumers.
*/
public void setFailIfNoConsumers(boolean failIfNoConsumers) {
this.failIfNoConsumers = failIfNoConsumers;
}
protected String getKey() {
String uri = getEndpointUri();
if (uri.indexOf('?') != -1) {
return StringHelper.before(uri, "?");
} else {
return uri;
}
}
}