io.datarouter.job.lock.LocalTriggerLockService Maven / Gradle / Ivy

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/*
 * Copyright © 2009 HotPads ([email protected])
 *
 * 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.datarouter.job.lock;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.ConcurrentMap;

import io.datarouter.job.BaseJob;
import io.datarouter.job.scheduler.JobWrapper;
import io.datarouter.job.util.DatarouterJobOutcome;
import jakarta.inject.Inject;
import jakarta.inject.Singleton;

@Singleton
public class LocalTriggerLockService{

	// allow only one JobWrapper per class
	private final ConcurrentMap,JobWrapper> jobWrapperByJobClass;

	@Inject
	public LocalTriggerLockService(){
		this.jobWrapperByJobClass = new ConcurrentHashMap<>();
	}

	public DatarouterJobOutcome acquire(JobWrapper jobWrapper){
		JobWrapper existingJobWrapper = jobWrapperByJobClass.putIfAbsent(jobWrapper.jobClass, jobWrapper);

		return existingJobWrapper == null // no previous JobWrapper found, so we got the lock
				? DatarouterJobOutcome.makeSuccess()
				: DatarouterJobOutcome.makeFailure("Unable to acquire local lock for job " + jobWrapper.jobClass);
	}

	public void release(Class jobClass){
		jobWrapperByJobClass.remove(jobClass);
	}

	public JobWrapper getForClass(Class key){
		return jobWrapperByJobClass.get(key);
	}

	public int getNumRunningJobs(){
		return jobWrapperByJobClass.size();
	}

	public List getJobWrappers(){
		return new ArrayList<>(jobWrapperByJobClass.values());
	}

	public void onShutdown(){
		jobWrapperByJobClass.values().forEach(JobWrapper::requestStop);
	}

}