/**
* 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.docker.consumer;
import java.util.Date;
import java.util.concurrent.ExecutorService;
import com.github.dockerjava.api.command.EventCallback;
import com.github.dockerjava.api.command.EventsCmd;
import com.github.dockerjava.api.model.Event;
import org.apache.camel.AsyncCallback;
import org.apache.camel.Exchange;
import org.apache.camel.Message;
import org.apache.camel.Processor;
import org.apache.camel.component.docker.DockerClientFactory;
import org.apache.camel.component.docker.DockerConstants;
import org.apache.camel.component.docker.DockerEndpoint;
import org.apache.camel.component.docker.DockerHelper;
import org.apache.camel.impl.DefaultConsumer;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Docker Consumer for streaming events
*/
public class DockerEventsConsumer extends DefaultConsumer implements EventCallback {
private static final transient Logger LOGGER = LoggerFactory.getLogger(DockerEventsConsumer.class);
private DockerEndpoint endpoint;
private EventsCmd eventsCmd;
private ExecutorService eventsExecutorService;
public DockerEventsConsumer(DockerEndpoint endpoint, Processor processor) throws Exception {
super(endpoint, processor);
this.endpoint = endpoint;
}
@Override
public DockerEndpoint getEndpoint() {
return (DockerEndpoint)super.getEndpoint();
}
/**
* Determine the point in time to begin streaming events
*/
private long processInitialEvent() {
long currentTime = new Date().getTime();
Long initialRange = DockerHelper.getProperty(DockerConstants.DOCKER_INITIAL_RANGE, endpoint.getConfiguration(), null, Long.class);
if (initialRange != null) {
currentTime = currentTime - initialRange;
}
return currentTime;
}
@Override
protected void doStart() throws Exception {
eventsCmd = DockerClientFactory.getDockerClient(endpoint.getConfiguration(), null).eventsCmd(this);
eventsCmd.withSince(String.valueOf(processInitialEvent()));
eventsExecutorService = eventsCmd.exec();
super.doStart();
}
@Override
protected void doStop() throws Exception {
if (eventsExecutorService != null && !eventsExecutorService.isTerminated()) {
LOGGER.trace("Stopping Docker events Executor Service");
eventsExecutorService.shutdown();
}
super.doStop();
}
@Override
public void onEvent(Event event) {
LOGGER.debug("Received Docker Event: " + event);
final Exchange exchange = getEndpoint().createExchange();
Message message = exchange.getIn();
message.setBody(event);
try {
LOGGER.trace("Processing exchange [{}]...", exchange);
getAsyncProcessor().process(exchange, new AsyncCallback() {
@Override
public void done(boolean doneSync) {
LOGGER.trace("Done processing exchange [{}]...", exchange);
}
});
} catch (Exception e) {
exchange.setException(e);
}
if (exchange.getException() != null) {
getExceptionHandler().handleException("Error processing exchange", exchange, exchange.getException());
}
}
@Override
public void onException(Throwable throwable) {
LOGGER.error("Error Consuming from Docker Events: {}", throwable.getMessage());
}
@Override
public void onCompletion(int numEvents) {
LOGGER.debug("Docker events connection completed. Events processed : {}", numEvents);
eventsCmd.withSince(null);
LOGGER.debug("Reestablishing connection with Docker");
eventsCmd.exec();
}
}