io.cdap.cdap.internal.app.runtime.workflow.WorkflowProgramController Maven / Gradle / Ivy
/*
* Copyright © 2014-2015 Cask Data, Inc.
*
* Licensed 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 io.cdap.cdap.internal.app.runtime.workflow;
import com.google.common.util.concurrent.Service;
import io.cdap.cdap.internal.app.runtime.AbstractProgramController;
import io.cdap.cdap.proto.id.ProgramId;
import io.cdap.cdap.proto.id.ProgramRunId;
import org.apache.twill.api.RunId;
import org.apache.twill.common.Threads;
import org.apache.twill.internal.ServiceListenerAdapter;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
*
*/
final class WorkflowProgramController extends AbstractProgramController {
private static final Logger LOG = LoggerFactory.getLogger(WorkflowProgramController.class);
private final WorkflowDriver driver;
private final String serviceName;
WorkflowProgramController(ProgramRunId programRunId, WorkflowDriver driver) {
super(programRunId);
this.driver = driver;
this.serviceName = getServiceName();
startListen(driver);
}
@Override
protected void doSuspend() throws Exception {
driver.suspend();
}
@Override
protected void doResume() throws Exception {
driver.resume();
}
@Override
protected void doStop() throws Exception {
driver.stopAndWait();
}
@Override
protected void doCommand(String name, Object value) throws Exception {
LOG.info("Command ignored {}, {}", name, value);
}
private void startListen(Service service) {
// Forward state changes from the given service to this controller.
service.addListener(new ServiceListenerAdapter() {
@Override
public void running() {
LOG.debug("Workflow service {} started", serviceName);
started();
}
@Override
public void terminated(Service.State from) {
LOG.debug("Workflow service terminated from {}. Un-registering service {}.", from, serviceName);
if (getState() != State.STOPPING) {
// service completed itself.
complete();
} else {
// service was terminated
stop();
}
}
@Override
public void failed(Service.State from, Throwable failure) {
LOG.error("Workflow service '{}' failed.", serviceName, failure);
error(failure);
}
}, Threads.SAME_THREAD_EXECUTOR);
}
private String getServiceName() {
ProgramId programId = getProgramRunId().getParent();
RunId runId = getRunId();
return String.format("workflow.%s.%s.%s.%s",
programId.getNamespace(), programId.getApplication(), programId.getProgram(),
runId.getId());
}
}