/* 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 org.activiti.engine.impl.cmd;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;
import org.activiti.engine.impl.Page;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.jobexecutor.AcquiredJobs;
import org.activiti.engine.impl.jobexecutor.JobExecutor;
import org.activiti.engine.impl.persistence.entity.JobEntity;
import org.activiti.engine.impl.persistence.entity.MessageEntity;
/**
* @author Nick Burch
* @author Daniel Meyer
*/
public class AcquireJobsCmd implements Command<AcquiredJobs> {
private final JobExecutor jobExecutor;
public AcquireJobsCmd(JobExecutor jobExecutor) {
this.jobExecutor = jobExecutor;
}
public AcquiredJobs execute(CommandContext commandContext) {
String lockOwner = jobExecutor.getLockOwner();
int lockTimeInMillis = jobExecutor.getLockTimeInMillis();
int maxNonExclusiveJobsPerAcquisition = jobExecutor.getMaxJobsPerAcquisition();
AcquiredJobs acquiredJobs = new AcquiredJobs();
List<JobEntity> jobs = commandContext
.getJobEntityManager()
.findNextJobsToExecute(new Page(0, maxNonExclusiveJobsPerAcquisition));
for (JobEntity job: jobs) {
List<String> jobIds = new ArrayList<String>();
if (job != null && !acquiredJobs.contains(job.getId())) {
if (job instanceof MessageEntity && job.isExclusive() && job.getProcessInstanceId() != null) {
// wait to get exclusive jobs within 100ms
try {
Thread.sleep(100);
} catch (InterruptedException e) {}
// acquire all exclusive jobs in the same process instance
// (includes the current job)
List<JobEntity> exclusiveJobs = commandContext.getJobEntityManager()
.findExclusiveJobsToExecute(job.getProcessInstanceId());
for (JobEntity exclusiveJob : exclusiveJobs) {
if (exclusiveJob != null) {
lockJob(commandContext, exclusiveJob, lockOwner, lockTimeInMillis);
jobIds.add(exclusiveJob.getId());
}
}
} else {
lockJob(commandContext, job, lockOwner, lockTimeInMillis);
jobIds.add(job.getId());
}
}
acquiredJobs.addJobIdBatch(jobIds);
}
return acquiredJobs;
}
protected void lockJob(CommandContext commandContext, JobEntity job, String lockOwner, int lockTimeInMillis) {
job.setLockOwner(lockOwner);
GregorianCalendar gregorianCalendar = new GregorianCalendar();
gregorianCalendar.setTime(commandContext.getProcessEngineConfiguration().getClock().getCurrentTime());
gregorianCalendar.add(Calendar.MILLISECOND, lockTimeInMillis);
job.setLockExpirationTime(gregorianCalendar.getTime());
}
}