Package org.apache.synapse.mediators.builtin

Source Code of org.apache.synapse.mediators.builtin.EnqueueMediator

/*
*  Licensed to the Apache Software Foundation (ASF) under one
*  or more contributor license agreements.  See the NOTICE file
*  distributed with this work for additional information
*  regarding copyright ownership.  The ASF licenses this file
*  to you 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.mediators.builtin;

import org.apache.synapse.mediators.AbstractMediator;
import org.apache.synapse.mediators.MediatorWorker;
import org.apache.synapse.mediators.base.SequenceMediator;
import org.apache.synapse.MessageContext;
import org.apache.synapse.Mediator;
import org.apache.synapse.SynapseLog;
import org.apache.synapse.commons.executors.PriorityExecutor;
import org.apache.synapse.core.axis2.Axis2MessageContext;

/**
* This mediator execute a given sequence with a given priority.
*
* It accepts the priority as and argument. The executor used for executing this
* sequence should support this priority. If it doesn't support this priority it
* executor can throw exceptions.
*/
public class EnqueueMediator extends AbstractMediator {
    private String executorName = null;

    private int priority = 0;

    private String sequenceName = null;

    public boolean mediate(MessageContext synCtx) {
        SynapseLog log = getLog(synCtx);
        if (log.isTraceOrDebugEnabled()) {
            log.traceOrDebug("Start: enqueue mediator");
        }

        assert executorName != null : "executor name shouldn't be null";

        PriorityExecutor executor = synCtx.getConfiguration().
                getPriorityExecutors().get(executorName);
        if (executor == null) {
            handleException("executor cannot be found for the name : " + executorName, synCtx);
            return false;
        }


        Mediator m = synCtx.getSequence(sequenceName);
        if (m != null && m instanceof SequenceMediator) {
            MediatorWorker worker = new MediatorWorker(m, synCtx);
            // execute with the given priority
            executor.execute(worker, priority);

            // with the nio transport, this causes the listener not to write a 202
            // Accepted response, as this implies that Synapse does not yet know if
            // a 202 or 200 response would be written back.
            ((Axis2MessageContext) synCtx).getAxis2MessageContext().getOperationContext().setProperty(
                    org.apache.axis2.Constants.RESPONSE_WRITTEN, "SKIP");

            if (log.isTraceOrDebugEnabled()) {
                log.traceOrDebug("End: enqueue mediator");
            }

            return true;
        } else {
            handleException("Sequence cannot be found : " + sequenceName, synCtx);
            return false;
        }              
    }

    public String getExecutorName() {
        return executorName;
    }

    public int getPriority() {
        return priority;
    }

    public String getSequenceName() {
        return sequenceName;
    }

    public void setExecutorName(String executorName) {
        this.executorName = executorName;
    }

    public void setPriority(int priority) {
        this.priority = priority;
    }

    public void setSequenceName(String sequenceName) {
        this.sequenceName = sequenceName;
    }
}
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