/*
* 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 gobblin.runtime.std;
import java.io.Closeable;
import java.io.IOException;
import java.util.concurrent.ExecutorService;
import org.slf4j.Logger;
import com.google.common.base.Optional;
import gobblin.runtime.JobState.RunningState;
import gobblin.runtime.api.JobExecutionState;
import gobblin.runtime.api.JobExecutionStateListener;
import gobblin.runtime.api.JobExecutionStateListenerContainer;
import gobblin.util.callbacks.CallbacksDispatcher;
/**
* A helper class to maintain a list of {@link JobExecutionStateListener} instances. It itself
* implements the JobExecutionStateListener interface so all calls are dispatched to the children
* listeners.
*/
public class JobExecutionStateListeners
implements JobExecutionStateListener, JobExecutionStateListenerContainer, Closeable {
private CallbacksDispatcher<JobExecutionStateListener> _dispatcher;
public JobExecutionStateListeners(Optional<ExecutorService> execService,
Optional<Logger> log) {
_dispatcher = new CallbacksDispatcher<>(execService, log);
}
public JobExecutionStateListeners(Logger log) {
_dispatcher = new CallbacksDispatcher<>(log);
}
public JobExecutionStateListeners() {
_dispatcher = new CallbacksDispatcher<>();
}
/** {@inheritDoc} */
@Override
public void registerStateListener(JobExecutionStateListener listener) {
_dispatcher.addListener(listener);
}
/** {@inheritDoc} */
@Override
public void unregisterStateListener(JobExecutionStateListener listener) {
_dispatcher.removeListener(listener);
}
/** {@inheritDoc} */
@Override
public void onStatusChange(JobExecutionState state, RunningState previousStatus,
RunningState newStatus) {
try {
_dispatcher.execCallbacks(new StatusChangeCallback(state, previousStatus, newStatus));
} catch (InterruptedException e) {
_dispatcher.getLog().warn("onStatusChange interrupted.");
}
}
/** {@inheritDoc} */
@Override
public void onStageTransition(JobExecutionState state, String previousStage, String newStage) {
try {
_dispatcher.execCallbacks(new StageTransitionCallback(state, previousStage, newStage));
} catch (InterruptedException e) {
_dispatcher.getLog().warn("onStageTransition interrupted.");
}
}
/** {@inheritDoc} */
@Override
public void onMetadataChange(JobExecutionState state, String key, Object oldValue, Object newValue) {
try {
_dispatcher.execCallbacks(new MetadataChangeCallback(state, key, oldValue, newValue));
} catch (InterruptedException e) {
_dispatcher.getLog().warn("onMetadataChange interrupted.");
}
}
@Override
public void registerWeakStateListener(JobExecutionStateListener listener) {
_dispatcher.addWeakListener(listener);
}
@Override
public void close()
throws IOException {
_dispatcher.close();
}
}