X-Git-Url: http://wamblee.org/gitweb/?a=blobdiff_plain;f=support%2Fgeneral%2Fsrc%2Fmain%2Fjava%2Forg%2Fwamblee%2Fobserver%2FObservable.java;h=096b0600043f726d9bdc493f83d3aacbe2e19d78;hb=ddd261f331280640c5b53c7128230b629ebcd268;hp=2980afafd33dbc63a0a7416e6aed4ca7cb2396c9;hpb=32a62ca2c752e33a7873ac868a7a1f289caedcd4;p=utils

diff --git a/support/general/src/main/java/org/wamblee/observer/Observable.java b/support/general/src/main/java/org/wamblee/observer/Observable.java
index 2980afaf..096b0600 100644
--- a/support/general/src/main/java/org/wamblee/observer/Observable.java
+++ b/support/general/src/main/java/org/wamblee/observer/Observable.java
@@ -1,114 +1,117 @@
 /*
  * Copyright 2005 the original author or authors.
- * 
+ *
  * Licensed 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.wamblee.observer;
 
-import java.util.List;
+import org.apache.log4j.Logger;
+
 import java.util.ArrayList;
+import java.util.List;
 import java.util.Map;
 import java.util.TreeMap;
 
-import org.apache.log4j.Logger;
 
 /**
  * Implements subscription and notification logic for an observer pattern. This
  * class is thread safe.
  */
 public class Observable<ObservableType, Event> {
-
     private static final Logger LOGGER = Logger.getLogger(Observable.class);
 
     /**
      * Observable.
      */
-    private ObservableType _observable;
+    private ObservableType observable;
 
     /**
      * Used to notify observers.
      */
-    private ObserverNotifier<ObservableType, Event> _notifier;
+    private ObserverNotifier<ObservableType, Event> notifier;
 
     /**
      * Map of subscription to observer.
      */
-    private Map<Long, Observer<ObservableType, Event>> _observers;
+    private Map<Long, Observer<ObservableType, Event>> observers;
 
     /**
      * Counter for subscriptions. Holds the next subscription.
      */
-    private long _counter;
+    private long counter;
 
     /**
      * Constructs the observable.
-     * 
+     *
      * @param aObservable
      *            Observable this instance is used for.
      * @param aNotifier
      *            Object used for implementing notification of listeners.
      */
     public Observable(ObservableType aObservable,
-            ObserverNotifier<ObservableType, Event> aNotifier) {
-        _observable = aObservable;
-        _notifier = aNotifier;
-        _observers = new TreeMap<Long, Observer<ObservableType, Event>>();
-        _counter = 0;
+        ObserverNotifier<ObservableType, Event> aNotifier) {
+        observable = aObservable;
+        notifier = aNotifier;
+        observers = new TreeMap<Long, Observer<ObservableType, Event>>();
+        counter = 0;
     }
 
     /**
      * Subscribe an obvers.
-     * 
+     *
      * @param aObserver
      *            Observer to subscribe.
      * @return Event Event to send.
      */
-    public synchronized long subscribe(Observer<ObservableType, Event> aObserver) {
-        long subscription = _counter++; // integer rage is so large it will
-                                        // never roll over.
-        _observers.put(subscription, aObserver);
+    public synchronized long subscribe(
+        Observer<ObservableType, Event> aObserver) {
+        long subscription = counter++; // integer rage is so large it will
+                                       // never roll over.
+
+        observers.put(subscription, aObserver);
+
         return subscription;
     }
 
     /**
      * Unsubscribe an observer.
-     * 
+     *
      * @param aSubscription
      *            Subscription which is used
      * @throws IllegalArgumentException
      *             In case the subscription is not known.
      */
     public synchronized void unsubscribe(long aSubscription) {
-        Object obj = _observers.remove(aSubscription);
+        Object obj = observers.remove(aSubscription);
+
         if (obj == null) {
-            throw new IllegalArgumentException("Subscription '" + aSubscription
-                    + "'");
+            throw new IllegalArgumentException("Subscription '" +
+                aSubscription + "'");
         }
     }
 
     /**
      * Gets the number of subscribed observers.
-     * 
+     *
      * @return Number of subscribed observers.
      */
     public int getObserverCount() {
-        return _observers.size();
+        return observers.size();
     }
 
     /**
      * Notifies all subscribed observers.
-     * 
+     *
      * @param aEvent
      *            Event to send.
      */
@@ -116,31 +119,33 @@ public class Observable<ObservableType, Event> {
         // Make sure we do the notification while not holding the lock to avoid
         // potential deadlock
         // situations.
-        List<Observer<ObservableType, Event>> observers = new ArrayList<Observer<ObservableType, Event>>();
+        List<Observer<ObservableType, Event>> myObservers = new ArrayList<Observer<ObservableType, Event>>();
+
         synchronized (this) {
-            observers.addAll(_observers.values());
+            myObservers.addAll(observers.values());
         }
-        for (Observer<ObservableType, Event> observer : observers) {
-            _notifier.update(observer, _observable, aEvent);
+
+        for (Observer<ObservableType, Event> observer : myObservers) {
+            notifier.update(observer, observable, aEvent);
         }
     }
 
     /*
      * (non-Javadoc)
-     * 
+     *
      * @see java.lang.Object#finalize()
      */
     @Override
     protected void finalize() throws Throwable {
-        if (_observers.size() > 0) {
-            LOGGER
-                    .error("Still observers registered at finalization of observer!");
-            for (Observer observer : _observers.values()) {
+        if (observers.size() > 0) {
+            LOGGER.error(
+                "Still observers registered at finalization of observer!");
+
+            for (Observer observer : observers.values()) {
                 LOGGER.error("  observer: " + observer);
             }
         }
 
         super.finalize();
     }
-
 }