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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.impl;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import org.apache.qpid.management.Messages;
import org.apache.qpid.management.Names;
import org.apache.qpid.management.Protocol;
import org.apache.qpid.management.domain.handler.base.BaseMessageHandler;
import org.apache.qpid.management.domain.model.type.Binary;
import org.apache.qpid.transport.codec.Decoder;
/**
* Schema Response message handler.
* This handler is responsible to process 'S'(opcode) messages sent by the management broker containing the full
* schema details for a class.
*
* @author Andrea Gazzarini
*/
public class SchemaResponseMessageHandler extends BaseMessageHandler
{
/**
* Behavioural interface for classes that are responsible to deal with schema messages.
*
* @author Andrea Gazzarini
*/
interface IProcessor
{
/**
* Processes the incoming message using the given decoder.
*
* @param decoder the decoder used for dealing with incoming message.
*/
void process(Decoder decoder);
}
/**
* Processor responsible to deal with class schema related messages.
*/
final IProcessor _classSchemaProcessor = new IProcessor()
{
public void process(Decoder decoder)
{
try
{
String packageName = decoder.readStr8();
String className = decoder.readStr8();
Binary schemaHash = new Binary(decoder.readBin128());
int howManyProperties = decoder.readUint16();
int howManyStatistics = decoder.readUint16();
int howManyMethods = decoder.readUint16();
_domainModel.addSchema(
packageName,
className,
schemaHash,
getAttributes(decoder, howManyProperties),
getAttributes(decoder, howManyStatistics),
getMethods(decoder, howManyMethods));
} catch(Exception exception)
{
_logger.error(exception,Messages.QMAN_100005_CLASS_SCHEMA_PROCESSING_FAILURE);
}
}
};
/**
* Processor responsible to deal with class event related messages.
*/
final IProcessor _eventSchemaProcessor = new IProcessor()
{
public void process(Decoder decoder)
{
try
{
String packageName = decoder.readStr8();
String className = decoder.readStr8();
Binary hash = new Binary(decoder.readBin128());
int howManyArguments = decoder.readUint16();
_domainModel.addEventSchema(
packageName,
className,
hash,
getAttributes(decoder, howManyArguments));
} catch(Exception exception)
{
_logger.error(exception,Messages.QMAN_100006_EVENT_SCHEMA_PROCESSING_FAILURE);
}
}
};
/**
* Processes an incoming schema response.
* This will be used for building the corresponding class definition.
*
* @param decoder the decoder used for parsing the incoming stream.
* @param sequenceNumber the sequence number of the incoming message.
*/
public void process (Decoder decoder, int sequenceNumber)
{
try
{
int classKind = decoder.readUint8();
switch(classKind)
{
case Protocol.CLASS :
{
_classSchemaProcessor.process(decoder);
break;
}
case Protocol.EVENT :
{
_eventSchemaProcessor.process(decoder);
break;
}
default :
{
_logger.error(Messages.QMAN_100011_UNKNOWN_CLASS_KIND,classKind);
}
}
} catch(Exception exception)
{
_logger.error(exception,Messages.QMAN_100012_SCHEMA_MESSAGE_PROCESSING_FAILURE);
}
}
/**
* Reads from the incoming message stream the properties definitions.
*
* @param decoder the decoder used for decode incoming data.
* @param howManyProperties the number of properties to read.
* @return a list of maps. Each map contains a property definition.
*/
List<Map<String, Object>> getAttributes(Decoder decoder,int howMany)
{
List<Map<String, Object>> result = new ArrayList<Map<String, Object>>(howMany);
for (int i = 0; i < howMany; i++ )
{
result.add(decoder.readMap());
}
return result;
}
/**
* Reads the methods definitions from the incoming message stream.
*
* @param decoder the decoder used for decode incoming data.
* @param howManyMethods the number of methods to read.
* @return a list method definitions.
*/
List<MethodOrEventDataTransferObject> getMethods(Decoder decoder, int howManyMethods)
{
List<MethodOrEventDataTransferObject> result = new ArrayList<MethodOrEventDataTransferObject>(howManyMethods);
for (int i = 0; i < howManyMethods; i++)
{
Map<String,Object> method = decoder.readMap();
int howManyArguments = (Integer) method.get(Names.ARG_COUNT_PARAM_NAME);
List<Map<String,Object>> arguments = new ArrayList<Map<String,Object>>(howManyArguments);
for (int argIndex = 0; argIndex < howManyArguments; argIndex++)
{
arguments.add(decoder.readMap());
}
result.add(new MethodOrEventDataTransferObject(method,arguments));
}
return result;
}
/**
* Reads the events definitions from the incoming message stream.
*
* @param decoder the decoder used for decode incoming data.
* @param howManyEvents the number of events to read.
* @return a list event definitions.
*/
List<MethodOrEventDataTransferObject> getEvents(Decoder decoder, int howManyEvents)
{
List<MethodOrEventDataTransferObject> result = new ArrayList<MethodOrEventDataTransferObject>(howManyEvents);
for (int i = 0; i < howManyEvents; i++)
{
Map<String,Object> method = decoder.readMap();
int howManyArguments = (Integer) method.get(Names.ARG_COUNT_PARAM_NAME);
List<Map<String,Object>> arguments = new ArrayList<Map<String,Object>>(howManyArguments);
for (int argIndex = 0; argIndex < howManyArguments; argIndex++)
{
arguments.add(decoder.readMap());
}
result.add(new MethodOrEventDataTransferObject(method,arguments));
}
return result;
}
}
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