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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.interceptor;

import org.activiti.engine.impl.delegate.DelegateInvocation;

/**
 * Interceptor responsible for handling calls to 'user code'. User code
 * represents external Java code (e.g. services and listeners) invoked by
 * activiti. The following is a list of classes that represent user code:
 * 
 * {@link org.activiti.engine.delegate.JavaDelegate}
 * {@link org.activiti.engine.delegate.ExecutionListener}
 * {@link org.activiti.engine.delegate.Expression}
 * {@link org.activiti.engine.delegate.TaskListener}
 * 
 * 
 * The interceptor is passed in an instance of {@link DelegateInvocation}.
 * Implementations are responsible for calling
 * {@link DelegateInvocation#proceed()}.
 * 
 * @author Daniel Meyer
 */
public interface DelegateInterceptor {

  public void handleInvocation(DelegateInvocation invocation) throws Exception;

}