# CacheMessageBuilderDispatchandler.java

    /*
     * Copyright 2005,2006 WSO2, Inc. http://www.wso2.org
     *
     * 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.apache.synapse.transport.passthru.util;

    import org.apache.axis2.AxisFault;
    import org.apache.axis2.addressing.EndpointReference;
    import org.apache.axis2.context.MessageContext;
    import org.apache.axis2.description.AxisOperation;
    import org.apache.axis2.description.AxisService;
    import org.apache.axis2.description.HandlerDescription;
    import org.apache.axis2.description.Parameter;
    import org.apache.axis2.engine.AbstractDispatcher;
    import org.apache.commons.logging.Log;
    import org.apache.commons.logging.LogFactory;
    import org.apache.synapse.transport.util.MessageHandlerProvider;
    import org.apache.synapse.transport.netty.util.RequestResponseUtils;
    import org.apache.synapse.transport.passthru.PassThroughConstants;
    import org.apache.synapse.transport.passthru.Pipe;
    import org.wso2.caching.CacheConfiguration;
    import org.wso2.caching.CachingConstants;

    public class CacheMessageBuilderDispatchandler extends AbstractDispatcher {

    	private static final Log log = LogFactory.getLog(CacheMessageBuilderDispatchandler.class);

    	public static final String NAME = "CacheMessageBuilderDispatchandler";

    	@Override
    	public InvocationResponse invoke(MessageContext messageContext) throws AxisFault {
    		InvocationResponse invocationResponse = super.invoke(messageContext);

    		EndpointReference toEPR = messageContext.getTo();

    		Pipe pipe = (Pipe) messageContext.getProperty(PassThroughConstants.PASS_THROUGH_PIPE);

    		if ((pipe != null || RequestResponseUtils.isHttpCarbonMessagePresent(messageContext))
    				&& messageContext.getAxisMessage() != null) {
    			CacheConfiguration cacheCfg = null;
    			Parameter ccfgParam = messageContext.getAxisMessage().getParameter(CachingConstants.CACHE_CONFIGURATION);

    			if (ccfgParam != null && ccfgParam.getValue() instanceof CacheConfiguration) {

                    cacheCfg = (CacheConfiguration) ccfgParam.getValue();
                    // even though we found a cache config, if the timeout is <= 0, caching is disabled
                    if (cacheCfg.getTimeout() <= 0) {
                        return invocationResponse;
                    }
                    try {
                        MessageHandlerProvider.getMessageHandler(messageContext)
                                .buildMessage(messageContext, false);
                    } catch (Exception e) {
                    	log.error("Error while executing the message at cache message builder handler", e);
                    }
    			}

    		}

    		return invocationResponse;
    	}

    	@Override
    	public AxisOperation findOperation(AxisService arg0, MessageContext arg1) throws AxisFault {
    		// TODO Auto-generated method stub
    		return null;
    	}

    	@Override
    	public AxisService findService(MessageContext arg0) throws AxisFault {
    		// TODO Auto-generated method stub
    		return null;
    	}

    	@Override
    	public void initDispatcher() {
    		init(new HandlerDescription(NAME));
    	}

    }