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30 day Evaluation Version distributed via the Maven Jar Repository. Clover is not free. You have 30 days to evaluate it. Please visit http://www.thecortex.net/clover to obtain a licensed version of Clover | |||||||||||||||||||
Source file | Conditionals | Statements | Methods | TOTAL | |||||||||||||||
PipelineAssembler.java | 100% | 100% | 100% | 100% |
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// Copyright 2004, 2005 The Apache Software Foundation
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package org.apache.hivemind.lib.pipeline;
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import java.util.List;
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import org.apache.hivemind.ErrorLog;
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import org.apache.hivemind.Location;
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import org.apache.hivemind.impl.BaseLocatable;
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import org.apache.hivemind.lib.DefaultImplementationBuilder;
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import org.apache.hivemind.order.Orderer;
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import org.apache.hivemind.service.ClassFactory;
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/**
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* Used by the {@link org.apache.hivemind.lib.pipeline.PipelineFactory}to assemble the pipeline.
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*
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* @author Howard Lewis Ship
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*/
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public class PipelineAssembler extends BaseLocatable |
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{ |
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/** @since 1.1 */
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private ErrorLog _errorLog;
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private String _serviceId;
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private Class _serviceInterface;
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private Class _filterInterface;
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private ClassFactory _classFactory;
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private DefaultImplementationBuilder _defaultBuilder;
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private Orderer _orderer;
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private Object _terminator;
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private Location _terminatorLocation;
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/**
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* @param errorLog
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* used for reporting recoverable errors
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* @param serviceInterface
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* the main interface
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* @param filterInterface
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* the interface for filters
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* @param classFactory
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* for creating new classes
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* @param defaultBuilder
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* used to provide a placeholder terminator if no real terminator is supplied
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* @param servceId
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* of the service being assembled
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*/
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public PipelineAssembler(ErrorLog errorLog, String serviceId, Class serviceInterface,
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Class filterInterface, ClassFactory classFactory, |
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DefaultImplementationBuilder defaultBuilder) |
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{ |
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_errorLog = errorLog; |
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_serviceId = serviceId; |
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_serviceInterface = serviceInterface; |
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_filterInterface = filterInterface; |
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_classFactory = classFactory; |
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_defaultBuilder = defaultBuilder; |
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_orderer = new Orderer(_errorLog, "filter"); |
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} |
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public void addFilter(String name, String prereqs, String postreqs, Object filter, |
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Location location) |
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{ |
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if (!checkInterface(_filterInterface, filter, location))
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return;
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FilterHolder holder = new FilterHolder(filter, location);
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_orderer.add(holder, name, prereqs, postreqs); |
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} |
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public void setTerminator(Object terminator, Location terminatorLocation) |
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{ |
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if (_terminator != null) |
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{ |
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_errorLog.error(PipelineMessages.duplicateTerminator( |
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terminator, |
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_serviceId, |
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_terminator, |
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_terminatorLocation), terminatorLocation, null);
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return;
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} |
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if (!checkInterface(_serviceInterface, terminator, terminatorLocation))
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return;
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_terminator = terminator; |
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_terminatorLocation = terminatorLocation; |
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} |
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// For testing
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Object getTerminator() |
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{ |
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return _terminator;
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} |
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private boolean checkInterface(Class interfaceType, Object instance, Location location) |
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{ |
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if (interfaceType.isAssignableFrom(instance.getClass()))
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return true; |
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_errorLog.error( |
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PipelineMessages.incorrectInterface(instance, interfaceType, _serviceId), |
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location, |
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null);
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return false; |
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} |
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/**
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* Returns an object that implements the service interface, and integrates any filters for the
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* pipeline with the
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*/
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public Object createPipeline()
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{ |
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List filterHolders = _orderer.getOrderedObjects(); |
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int count = filterHolders.size();
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BridgeBuilder bb = (count == 0) ? null : new BridgeBuilder(_errorLog, _serviceId, |
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_serviceInterface, _filterInterface, _classFactory); |
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Object next = _terminator != null ? _terminator : _defaultBuilder
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.buildDefaultImplementation(_serviceInterface); |
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// Like service interceptors, we work deepest (last) to shallowest (first).
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for (int i = count - 1; i >= 0; i--) |
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{ |
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FilterHolder h = (FilterHolder) filterHolders.get(i); |
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Object filter = h.getFilter(); |
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next = bb.instantiateBridge(next, filter); |
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} |
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return next;
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} |
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} |
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