/*
* Copyright (c) MuleSoft, Inc. All rights reserved. http://www.mulesoft.com
* The software in this package is published under the terms of the CPAL v1.0
* license, a copy of which has been included with this distribution in the
* LICENSE.txt file.
*/
package org.mule.runtime.core.internal.keygenerator;
import org.mule.runtime.core.api.Event;
import org.mule.runtime.core.api.MuleContext;
import org.mule.runtime.core.api.MuleEventKeyGenerator;
import org.mule.runtime.core.api.context.MuleContextAware;
import org.mule.runtime.core.util.AttributeEvaluator;
import java.io.NotSerializableException;
import java.io.Serializable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Implements {@link org.mule.runtime.core.api.MuleEventKeyGenerator} using the Mule expression language to generate the cache
* keys.
*/
public class ExpressionMuleEventKeyGenerator implements MuleEventKeyGenerator, MuleContextAware {
protected Logger logger = LoggerFactory.getLogger(getClass());
private AttributeEvaluator attributeEvaluator;
@Override
public Serializable generateKey(Event event) throws NotSerializableException {
Object key = attributeEvaluator.resolveValue(event);
if (logger.isDebugEnabled()) {
logger.debug("Generated key for event: " + event + " key: " + key);
}
if (key instanceof Serializable) {
return (Serializable) key;
} else {
throw new NotSerializableException("Generated key must a serializable object but was "
+ (key != null ? key.getClass().getName() : "null"));
}
}
public String getExpression() {
return this.attributeEvaluator.getRawValue();
}
public void setExpression(String expression) {
this.attributeEvaluator = new AttributeEvaluator(expression);
}
@Override
public void setMuleContext(MuleContext muleContext) {
attributeEvaluator.initialize(muleContext.getExpressionManager());
}
}