Index: adblockplussbrowser/src/main/java/org/adblockplus/sbrowser/contentblocker/engine/EngineManager.java |
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new file mode 100644 |
--- /dev/null |
+++ b/adblockplussbrowser/src/main/java/org/adblockplus/sbrowser/contentblocker/engine/EngineManager.java |
@@ -0,0 +1,142 @@ |
+/* |
+ * This file is part of Adblock Plus <https://adblockplus.org/>, |
+ * Copyright (C) 2006-present eyeo GmbH |
+ * |
+ * Adblock Plus is free software: you can redistribute it and/or modify |
+ * it under the terms of the GNU General Public License version 3 as |
+ * published by the Free Software Foundation. |
+ * |
+ * Adblock Plus 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 Adblock Plus. If not, see <http://www.gnu.org/licenses/>. |
+ */ |
+ |
+package org.adblockplus.sbrowser.contentblocker.engine; |
+ |
+import android.content.Context; |
+import android.os.AsyncTask; |
+ |
+import java.io.IOException; |
+import java.lang.ref.WeakReference; |
+import java.util.ArrayList; |
+import java.util.Iterator; |
+import java.util.List; |
+ |
+public class EngineManager |
+{ |
+ private static final EngineManager INSTANCE = new EngineManager(); |
+ |
+ private Engine engine; |
+ private CreateEngineAsyncTask createEngineTask; |
+ private final List<WeakReference<OnEngineCreatedCallback>> engineCreatedCallbacks = new ArrayList<>(); |
+ |
+ private EngineManager() |
+ { |
+ } |
+ |
+ public static EngineManager getInstance() |
+ { |
+ return INSTANCE; |
+ } |
+ |
+ public void retrieveEngine(final Context context, final OnEngineCreatedCallback callback) |
+ { |
+ synchronized (engineCreatedCallbacks) |
+ { |
+ if (callback != null) |
+ { |
+ engineCreatedCallbacks.add(new WeakReference<>(callback)); |
+ } |
+ } |
+ if (engine != null) |
+ { |
+ notifyEngineCreated(); |
+ } |
+ else if (createEngineTask == null || createEngineTask.isCancelled()) |
+ { |
+ this.createEngineTask = new CreateEngineAsyncTask(); |
+ this.createEngineTask.execute(context); |
+ } |
+ } |
+ |
+ public void removeOnEngineCreatedCallback(final OnEngineCreatedCallback callback) |
+ { |
+ if (callback != null) |
+ { |
+ synchronized (engineCreatedCallbacks) |
+ { |
+ final Iterator<WeakReference<OnEngineCreatedCallback>> iterator = engineCreatedCallbacks.iterator(); |
+ while (iterator.hasNext()) |
+ { |
+ final OnEngineCreatedCallback cb = iterator.next().get(); |
+ if (callback.equals(cb)) |
+ { |
+ iterator.remove(); |
+ } |
+ } |
+ } |
+ } |
+ } |
+ |
+ private void setEngineAndNotify(final Engine engine) |
+ { |
+ this.createEngineTask = null; |
+ this.engine = engine; |
+ notifyEngineCreated(); |
+ } |
+ |
+ private void notifyEngineCreated() |
+ { |
+ synchronized (engineCreatedCallbacks) |
+ { |
+ final Iterator<WeakReference<OnEngineCreatedCallback>> iterator = engineCreatedCallbacks.iterator(); |
+ while (iterator.hasNext()) |
+ { |
+ final OnEngineCreatedCallback callback = iterator.next().get(); |
+ if (callback != null) |
+ { |
+ Engine.runOnUiThread(new Runnable() |
+ { |
+ @Override |
+ public void run() |
+ { |
+ callback.onEngineCreated(engine); |
+ } |
+ }); |
+ } |
+ iterator.remove(); |
+ } |
+ } |
+ } |
+ |
+ public interface OnEngineCreatedCallback |
+ { |
+ void onEngineCreated(Engine engine); |
+ } |
+ |
+ private static final class CreateEngineAsyncTask extends AsyncTask<Context, Void, Engine> |
+ { |
+ @Override |
+ protected Engine doInBackground(final Context... context) |
+ { |
+ try |
+ { |
+ return Engine.create(context[0].getApplicationContext()); |
+ } |
+ catch (IOException e) |
+ { |
+ } |
+ return null; |
+ } |
+ |
+ @Override |
+ protected void onPostExecute(final Engine engine) |
+ { |
+ EngineManager.getInstance().setEngineAndNotify(engine); |
+ } |
+ } |
+} |