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/*
 * Copyright Camunda Services GmbH and/or licensed to Camunda Services GmbH
 * under one or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information regarding copyright
 * ownership. Camunda licenses this file to you under the Apache License,
 * Version 2.0; 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.camunda.bpm.engine.impl.jobexecutor;

import java.util.List;

import org.camunda.bpm.container.ExecutorService;
import org.camunda.bpm.container.RuntimeContainerDelegate;
import org.camunda.bpm.engine.ProcessEngineException;
import org.camunda.bpm.engine.impl.ProcessEngineImpl;

/**
 * JobExecutor implementation that delegates the execution of jobs
 * to the {@link RuntimeContainerDelegate RuntimeContainer}
 *
 * @author Daniel Meyer
 *
 */
public class RuntimeContainerJobExecutor extends JobExecutor {

  protected void startExecutingJobs() {

    final RuntimeContainerDelegate runtimeContainerDelegate = getRuntimeContainerDelegate();

    // schedule job acquisition
    if(!runtimeContainerDelegate.getExecutorService().schedule(acquireJobsRunnable, true)) {
      throw new ProcessEngineException("Could not schedule AcquireJobsRunnable for execution.");
    }

  }

  protected void stopExecutingJobs() {
    // nothing to do
  }

  public void executeJobs(List jobIds, ProcessEngineImpl processEngine) {

    final RuntimeContainerDelegate runtimeContainerDelegate = getRuntimeContainerDelegate();
    final ExecutorService executorService = runtimeContainerDelegate.getExecutorService();

    Runnable executeJobsRunnable = getExecuteJobsRunnable(jobIds, processEngine);

    // delegate job execution to runtime container
    if(!executorService.schedule(executeJobsRunnable, false)) {

      logRejectedExecution(processEngine, jobIds.size());
      rejectedJobsHandler.jobsRejected(jobIds, processEngine, this);
    }
  }

  protected RuntimeContainerDelegate getRuntimeContainerDelegate() {
    return RuntimeContainerDelegate.INSTANCE.get();
  }

  @Override
  public Runnable getExecuteJobsRunnable(List jobIds, ProcessEngineImpl processEngine) {
    final RuntimeContainerDelegate runtimeContainerDelegate = getRuntimeContainerDelegate();
    final ExecutorService executorService = runtimeContainerDelegate.getExecutorService();

    return executorService.getExecuteJobsRunnable(jobIds, processEngine);
  }

}