org.eclipse.linuxtools.lttng/src/org/eclipse/linuxtools/lttng/state/evProcessor/EventProcessorProxy.java

   1 /*******************************************************************************
   2  * Copyright (c) 2009 Ericsson
   3  *
   4  * All rights reserved. This program and the accompanying materials are
   5  * made available under the terms of the Eclipse Public License v1.0 which
   6  * accompanies this distribution, and is available at
   7  * http://www.eclipse.org/legal/epl-v10.html
   8  *
   9  * Contributors:
  10  *   Alvaro Sanchez-Leon (alvsan09@gmail.com) - Initial API and implementation
  11  *******************************************************************************/
  12
  13 package org.eclipse.linuxtools.lttng.state.evProcessor;
  14
  15 import java.util.HashSet;
  16 import java.util.Set;
  17
  18 import org.eclipse.linuxtools.lttng.TraceDebug;
  19 import org.eclipse.linuxtools.lttng.state.evProcessor.state.StateEventToHandlerFactory;
  20
  21 /**
  22  * @author alvaro
  23  *
  24  */
  25 public class EventProcessorProxy {
  26         // ========================================================================
  27         // Data
  28         // =======================================================================
  29         private static EventProcessorProxy instance = null;
  30         private final Set<AbsEventToHandlerResolver> processingFactories = new HashSet<AbsEventToHandlerResolver>();
  31
  32
  33         // ========================================================================
  34         // Constructors
  35         // =======================================================================
  36         public EventProcessorProxy() {
  37                 // Manual creation of State update factory
  38                 addEventProcessorFactory(StateEventToHandlerFactory.getInstance());
  39         }
  40
  41         // ========================================================================
  42         // Methods
  43         // =======================================================================
  44         /**
  45          * @return the processingFactories
  46          */
  47         public Set<AbsEventToHandlerResolver> getProcessingFactories() {
  48                 return processingFactories;
  49         }
  50
  51         /**
  52          * Returns this singleton
  53          *
  54          * @return
  55          */
  56         public static EventProcessorProxy getInstance() {
  57                 if (instance == null) {
  58                         instance = new EventProcessorProxy();
  59                 }
  60
  61                 return instance;
  62         }
  63
  64         /**
  65          * Register a factory of event handler methods, each factory provides a map
  66          * to Before and After state update handlers
  67          *
  68          * @param handlersFactory
  69          */
  70         public void addEventProcessorFactory(
  71                         AbsEventToHandlerResolver handlersFactory) {
  72                 if (handlersFactory != null) {
  73                         //only add the listener if not already included
  74                         if (!processingFactories.contains(handlersFactory)) {
  75                                 processingFactories.add(handlersFactory);
  76                         }
  77                 } else {
  78                         TraceDebug
  79                                         .debug("An attempt to register a null factory has been detected");
  80                 }
  81         }
  82
  83         /**
  84          * Remove a factory previously added with addEventProcessorFactory
  85          *
  86          * @param handlersFactory
  87          */
  88         public void removeEventProcessorFactory(
  89                         IEventToHandlerResolver handlersFactory) {
  90                 if (handlersFactory != null) {
  91                         processingFactories.remove(handlersFactory);
  92                 }
  93         }
  94
  95 }