/*
* 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.config.xml;
import org.apache.axiom.om.OMAttribute;
import org.apache.axiom.om.OMElement;
import org.apache.synapse.Mediator;
import org.apache.synapse.mediators.eip.Target;
import org.apache.synapse.mediators.eip.sample.MessageQueue;
import org.apache.synapse.mediators.eip.sample.SamplingThrottleMediator;
import javax.xml.namespace.QName;
import java.util.Properties;
/**
* Builds the {@link org.apache.synapse.mediators.eip.sample.SamplingThrottleMediator} instance by looking at the
* following configuration</p>
*
* <pre><sampler id="string" rate="int" unitTime="long">
* <messageQueue class="string"/>
* <target .../>
* <sampler/>
* </pre>
*
* @see org.apache.synapse.config.xml.AbstractMediatorFactory
*/
public class SamplingThrottleMediatorFactory extends AbstractMediatorFactory {
private static final QName SAMPLER_Q
= new QName(XMLConfigConstants.SYNAPSE_NAMESPACE, "sampler");
private static final QName ID_ATTR
= new QName(XMLConfigConstants.NULL_NAMESPACE, "id");
private static final QName RATE_ATTR
= new QName(XMLConfigConstants.NULL_NAMESPACE, "rate");
private static final QName UNIT_TIME_ATTR
= new QName(XMLConfigConstants.NULL_NAMESPACE, "unitTime");
private static final QName MESSAGE_QUEUE_Q
= new QName(XMLConfigConstants.SYNAPSE_NAMESPACE, "messageQueue");
private static final QName CLASS_ATTR
= new QName(XMLConfigConstants.NULL_NAMESPACE, "class");
protected Mediator createSpecificMediator(OMElement omElement, Properties properties) {
SamplingThrottleMediator samplingThrottleMediator = new SamplingThrottleMediator();
processAuditStatus(samplingThrottleMediator, omElement);
OMAttribute idAttribute = omElement.getAttribute(ID_ATTR);
if (idAttribute != null) {
samplingThrottleMediator.setId(idAttribute.getAttributeValue());
}
OMAttribute rateAttribute = omElement.getAttribute(RATE_ATTR);
if (rateAttribute != null) {
try {
samplingThrottleMediator.setSamplingRate(
Integer.parseInt(rateAttribute.getAttributeValue()));
} catch (NumberFormatException nfe) {
handleException("Sampling rate has to be an integer value, but found : "
+ rateAttribute.getAttributeValue());
}
}
OMAttribute unitTimeAttribute = omElement.getAttribute(UNIT_TIME_ATTR);
if (unitTimeAttribute != null) {
try {
samplingThrottleMediator.setUnitTime(
Long.parseLong(unitTimeAttribute.getAttributeValue()));
} catch (NumberFormatException nfe) {
handleException("Sampling unitTime has to be a long value in milliseconds, " +
"but found : " + rateAttribute.getAttributeValue());
}
}
OMElement targetElem = omElement.getFirstChildWithName(TARGET_Q);
if (targetElem != null) {
Target target = TargetFactory.createTarget(targetElem, properties);
samplingThrottleMediator.setTarget(target);
} else {
handleException("Sampler requires a target for the sampling mediation");
}
OMElement messageQueueElem = omElement.getFirstChildWithName(MESSAGE_QUEUE_Q);
if (messageQueueElem != null && messageQueueElem.getAttribute(CLASS_ATTR) != null) {
String className = messageQueueElem.getAttributeValue(CLASS_ATTR);
try {
Class messageQueueImplClass = Class.forName(className);
Object obj = messageQueueImplClass.newInstance();
if (obj instanceof MessageQueue) {
samplingThrottleMediator.setMessageQueue((MessageQueue) obj);
} else {
handleException("Provided message queue class : " + className
+ " doesn't implement the org.apache.synapse.mediators." +
"eip.sample.MessageQueue interface");
}
} catch (ClassNotFoundException e) {
handleException("Couldn't find the class specified for the message queue " +
"implementation : " + className);
} catch (InstantiationException e) {
handleException("Couldn't instantiate the message queue : " + className);
} catch (IllegalAccessException e) {
handleException("Couldn't instantiate the message queue : " + className);
}
}
return samplingThrottleMediator;
}
public QName getTagQName() {
return SAMPLER_Q;
}
}