1 files changed, 87 insertions, 0 deletions
diff --git a/subsonic-android/src/net/sourceforge/subsonic/androidapp/util/CancellableTask.java b/subsonic-android/src/net/sourceforge/subsonic/androidapp/util/CancellableTask.java
new file mode 100644
index 00000000..9c8b06e1
--- /dev/null
+++ b/subsonic-android/src/net/sourceforge/subsonic/androidapp/util/CancellableTask.java
@@ -0,0 +1,87 @@
+/*
+ This file is part of Subsonic.
+
+ Subsonic is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ Subsonic is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with Subsonic.  If not, see <http://www.gnu.org/licenses/>.
+
+ Copyright 2009 (C) Sindre Mehus
+ */
+package net.sourceforge.subsonic.androidapp.util;
+
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.atomic.AtomicReference;
+
+import android.util.Log;
+
+/**
+ * @author Sindre Mehus
+ * @version $Id$
+ */
+public abstract class CancellableTask {
+
+    private static final String TAG = CancellableTask.class.getSimpleName();
+
+    private final AtomicBoolean running = new AtomicBoolean(false);
+    private final AtomicBoolean cancelled = new AtomicBoolean(false);
+    private final AtomicReference<Thread> thread = new AtomicReference<Thread>();
+    private final AtomicReference<OnCancelListener> cancelListener = new AtomicReference<OnCancelListener>();
+
+    public void cancel() {
+        Log.d(TAG, "Cancelling " + CancellableTask.this);
+        cancelled.set(true);
+
+        OnCancelListener listener = cancelListener.get();
+        if (listener != null) {
+            try {
+                listener.onCancel();
+            } catch (Throwable x) {
+                Log.w(TAG, "Error when invoking OnCancelListener.", x);
+            }
+        }
+    }
+
+    public boolean isCancelled() {
+        return cancelled.get();
+    }
+
+    public void setOnCancelListener(OnCancelListener listener) {
+        cancelListener.set(listener);
+    }
+
+    public boolean isRunning() {
+        return running.get();
+    }
+
+    public abstract void execute();
+
+    public void start() {
+        thread.set(new Thread() {
+            @Override
+            public void run() {
+                running.set(true);
+                Log.d(TAG, "Starting thread for " + CancellableTask.this);
+                try {
+                    execute();
+                } finally {
+                    running.set(false);
+                    Log.d(TAG, "Stopping thread for " + CancellableTask.this);
+                }
+            }
+        });
+        thread.get().start();
+    }
+
+    public static interface OnCancelListener {
+        void onCancel();
+    }
+}