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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.agenda;

import java.util.LinkedList;

import org.activiti.engine.impl.interceptor.CommandContext;
import org.activiti.engine.impl.persistence.entity.ExecutionEntity;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * @author Joram Barrez
 */
public class Agenda {

  private static final Logger logger = LoggerFactory.getLogger(Agenda.class);

  protected CommandContext commandContext;

  protected LinkedList operations = new LinkedList();

  public Agenda(CommandContext commandContext) {
    this.commandContext = commandContext;
  }

  public boolean isEmpty() {
    return operations.isEmpty();
  }

  public Runnable getNextOperation() {
    return operations.poll();
  }

  /**
   * Generic method to plan a {@link Runnable}.
   */
  public void planOperation(Runnable operation) {
    planOperation(operation, null);
  }

  /**
   * Generic method to plan a {@link Runnable}.
   */
  public void planOperation(Runnable operation, ExecutionEntity executionEntity) {
    operations.add(operation);
    logger.debug("Operation {} added to agenda", operation.getClass());

    if (executionEntity != null) {
      commandContext.addInvolvedExecution(executionEntity);
    }
  }

  /* SPECIFIC operations */

  public void planContinueProcessOperation(ExecutionEntity execution) {
    planOperation(new ContinueProcessOperation(commandContext, execution), execution);
  }

  public void planContinueProcessSynchronousOperation(ExecutionEntity execution) {
    planOperation(new ContinueProcessOperation(commandContext, execution, true, false), execution);
  }
  
  public void planContinueProcessInCompensation(ExecutionEntity execution) {
    planOperation(new ContinueProcessOperation(commandContext, execution, false, true), execution);
  }
  
  public void planContinueMultiInstanceOperation(ExecutionEntity execution) {
    planOperation(new ContinueMultiInstanceOperation(commandContext, execution), execution);
  }

  public void planTakeOutgoingSequenceFlowsOperation(ExecutionEntity execution) {
    planTakeOutgoingSequenceFlowsOperation(execution, true);
  }

  public void planTakeOutgoingSequenceFlowsOperation(ExecutionEntity execution, boolean evaluateConditions) {
    planOperation(new TakeOutgoingSequenceFlowsOperation(commandContext, execution, evaluateConditions), execution);
  }

  public void planEndExecutionOperation(ExecutionEntity execution) {
    planOperation(new EndExecutionOperation(commandContext, execution), execution);
  }

  public void planTriggerExecutionOperation(ExecutionEntity execution) {
    planOperation(new TriggerExecutionOperation(commandContext, execution), execution);
  }

  public void planDestroyScopeOperation(ExecutionEntity execution) {
    planOperation(new DestroyScopeOperation(commandContext, execution), execution);
  }
  
  public void planExecuteInactiveBehaviorsOperation() {
    planOperation(new ExecuteInactiveBehaviorsOperation(commandContext));
  }

  public CommandContext getCommandContext() {
    return commandContext;
  }

  public void setCommandContext(CommandContext commandContext) {
    this.commandContext = commandContext;
  }

  public LinkedList getOperations() {
    return operations;
  }

}