/**
* Copyright 2010 CosmoCode GmbH
*
* 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 de.cosmocode.palava.ipc;
import java.util.Map;
/**
* A chain containing none or many filters which will
* be called before, after or instead of the requested command.
*
* @author Willi Schoenborn
*/
public interface IpcCallFilterChain {
/**
* Proceed execution of this filter chain. The chain may not complete.
* It's up to the included filters to totally intercept an incoming call.
*
* @param call the incoming call
* @param command the command scheduled to process the call
* @return the generated content
* @throws IpcCommandExecutionException if filtering failed
*/
Map<String, Object> filter(IpcCall call, IpcCommand command) throws IpcCommandExecutionException;
}