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/* 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.asyncexecutor;

import org.activiti.engine.ActivitiOptimisticLockingException;
import org.activiti.engine.delegate.event.ActivitiEventType;
import org.activiti.engine.delegate.event.impl.ActivitiEventBuilder;
import org.activiti.engine.impl.cmd.ExecuteAsyncJobCmd;
import org.activiti.engine.impl.cmd.LockExclusiveJobCmd;
import org.activiti.engine.impl.cmd.UnlockExclusiveJobCmd;
import org.activiti.engine.impl.interceptor.Command;
import org.activiti.engine.impl.interceptor.CommandConfig;
import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.interceptor.CommandExecutor;
import org.activiti.engine.impl.jobexecutor.FailedJobCommandFactory;
import org.activiti.engine.impl.persistence.entity.JobEntity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Joram Barrez
 * @author Tijs Rademakers
 */
public class ExecuteAsyncRunnable implements Runnable {

	private static Logger log = LoggerFactory.getLogger(ExecuteAsyncRunnable.class);

	protected JobEntity job;
	protected CommandExecutor commandExecutor;

	public ExecuteAsyncRunnable(JobEntity job, CommandExecutor commandExecutor) {
		this.job = job;
		this.commandExecutor = commandExecutor;
	}

	public void run() {
	  
	  try {
  		if (job.isExclusive()) {
  	    commandExecutor.execute(new LockExclusiveJobCmd(job));
  	  }
  		
		} catch (ActivitiOptimisticLockingException optimisticLockingException) { 
      if (log.isDebugEnabled()) {
        log.debug("Optimistic locking exception during exclusive job acquisition. If you have multiple job executors running against the same database, " +
            "this exception means that this thread tried to acquire an exclusive job, which already was changed by another async executor thread." +
            "This is expected behavior in a clustered environment. " +
            "You can ignore this message if you indeed have multiple job executor acquisition threads running against the same database. " +
            "Exception message: {}", optimisticLockingException.getMessage());
      }
      
      commandExecutor.execute(new Command() {
      	public Void execute(CommandContext commandContext) {
      		commandContext.getJobEntityManager().retryAsyncJob(job);
      		return null;
      	}
      });
      return;
    
		} catch (Throwable t) {
		  log.error("Error while locking exclusive job " + job.getId(), t);
		  return;
		}
		
		try {
			commandExecutor.execute(new ExecuteAsyncJobCmd(job));
			
		} catch (final ActivitiOptimisticLockingException e) {
		  
		  handleFailedJob(e);
		  
		  if (log.isDebugEnabled()) {
        log.debug("Optimistic locking exception during job execution. If you have multiple async executors running against the same database, " +
            "this exception means that this thread tried to acquire an exclusive job, which already was changed by another async executor thread." +
            "This is expected behavior in a clustered environment. " +
            "You can ignore this message if you indeed have multiple job executor threads running against the same database. " +
            "Exception message: {}", e.getMessage());
      }
		  
		} catch (Throwable exception) {
		  handleFailedJob(exception);
       
      // Finally, Throw the exception to indicate the ExecuteAsyncJobCmd failed
      String message = "Job " + job.getId() + " failed";
      log.error(message, exception);
    }
		
		try {
			if (job.isExclusive()) {
			  commandExecutor.execute(new UnlockExclusiveJobCmd(job));
			}
			
		} catch (ActivitiOptimisticLockingException optimisticLockingException) { 
      if (log.isDebugEnabled()) {
        log.debug("Optimistic locking exception while unlocking the job. If you have multiple async executors running against the same database, " +
            "this exception means that this thread tried to acquire an exclusive job, which already was changed by another async executor thread." +
            "This is expected behavior in a clustered environment. " +
            "You can ignore this message if you indeed have multiple job executor acquisition threads running against the same database. " +
            "Exception message: {}", optimisticLockingException.getMessage());
      }
      
      return;
    
    } catch (Throwable t) {
      log.error("Error while unlocking exclusive job " + job.getId(), t);
      return;
    }
	}
	
	protected void handleFailedJob(final Throwable exception) {
	  commandExecutor.execute(new Command() {

      @Override
      public Void execute(CommandContext commandContext) {
        CommandConfig commandConfig = commandExecutor.getDefaultConfig().transactionRequiresNew();
        FailedJobCommandFactory failedJobCommandFactory = commandContext.getFailedJobCommandFactory();
        Command