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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.compatibility.Activiti5CompatibilityHandler;
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.activiti.engine.impl.util.Activiti5Util;
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() {
    Boolean isActiviti5ProcessDefinition = commandExecutor.execute(new Command() {

      @Override
      public Boolean execute(CommandContext commandContext) {
        boolean isActiviti5 = Activiti5Util.isActiviti5ProcessDefinitionId(commandContext, job.getProcessDefinitionId());
        if (isActiviti5) {
          commandContext.getProcessEngineConfiguration().getActiviti5CompatibilityHandler().executeJobWithLockAndRetry(job);
        }
        return isActiviti5;
      }
    });
    
    if (isActiviti5ProcessDefinition) {  
      return;
    }
    
    try {
      if (job.isExclusive()) {
        commandExecutor.execute(new LockExclusiveJobCmd(job));
      }

    } catch (Throwable lockException) {
      if (log.isDebugEnabled()) {
        log.debug("Exception during exclusive job acquisition. Retrying job.", lockException.getMessage());
      }

      commandExecutor.execute(new Command() {
        public Void execute(CommandContext commandContext) {
          commandContext.getJobEntityManager().retryAsyncJob(job);
          return null;
        }
      });
      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) {
        if (job.getProcessDefinitionId() != null && Activiti5Util.isActiviti5ProcessDefinitionId(commandContext, job.getProcessDefinitionId())) {
          Activiti5CompatibilityHandler activiti5CompatibilityHandler = Activiti5Util.getActiviti5CompatibilityHandler(); 
          activiti5CompatibilityHandler.handleFailedJob(job, exception);
          return null;
        }
        
        CommandConfig commandConfig = commandExecutor.getDefaultConfig().transactionRequiresNew();
        FailedJobCommandFactory failedJobCommandFactory = commandContext.getFailedJobCommandFactory();
        Command