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/*
*
* 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.qpid.management.domain.handler.base;
import org.apache.qpid.management.domain.model.type.Binary;
import org.apache.qpid.transport.codec.Decoder;
/**
* Base class for content indication message handlers.
*
* @author Andrea Gazzarini
*/
public abstract class ContentIndicationMessageHandler extends BaseMessageHandler
{
/**
* Processes the income message.
*
* @param decoder the decoder used to parse the message.
* @param sequenceNumber the sequence number of the message.
*/
public final void process (Decoder decoder, int sequenceNumber)
{
String packageName = decoder.readStr8();
String className = decoder.readStr8();
Binary classHash = new Binary(decoder.readBin128());
long timeStampOfCurrentSample = decoder.readDatetime();
long timeObjectWasCreated = decoder.readDatetime();
long timeObjectWasDeleted = decoder.readDatetime();
Binary objectId = new Binary(decoder.readBin128());
if (objectHasBeenRemoved(timeObjectWasDeleted, timeStampOfCurrentSample))
{
removeObjectInstance(packageName,className,classHash,objectId);
} else
{
updateDomainModel(
packageName,
className,
classHash,
objectId,
timeStampOfCurrentSample,
timeObjectWasCreated,
timeObjectWasDeleted,
decoder.readReaminingBytes());
}
}
/**
* Removes an object instance from the domain model.
*
* @param packageName the package name.
* @param className the class name.
* @param classHash the class hash.
* @param objectId the object identifier.
*/
void removeObjectInstance(String packageName, String className,Binary classHash, Binary objectId)
{
_domainModel.removeObjectInstance(packageName,className,classHash,objectId);
}
/**
* Checks if the timestamps contained in the message indicate that the object has been removed.
*
* @param deletionTimestamp time object was deleted.
* @param now timestamp of the current message.
* @return true if the object has been removed, false otherwise.
*/
boolean objectHasBeenRemoved(long deletionTimestamp, long now) {
return (deletionTimestamp != 0) && (now > deletionTimestamp);
}
/**
* Updates domain model with the incoming data.
* This is a template method that each concrete subclass must implement in order to update the domain model
* with the incoming data.
*
* @param packageName the name of the package.
* @param className the name of the class.
* @param objectId the object identifier.
* @param timeStampOfCurrentSample timestamp of current sample.
* @param timeObjectWasCreated time object was created.
* @param timeObjectWasDeleted time object was deleted.
* @param contentData object instance incoming data.
*/
protected abstract void updateDomainModel(
String packageName,
String className,
Binary classHash,
Binary objectId,
long timeStampOfCurrentSample,
long timeObjectWasCreated,
long timeObjectWasDeleted,
byte []contentData );
}
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