borrow AsyncTask stuff from libgdx

- for html backend async tasks are just put on Queue and run on next main-loop iteration

vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/utils/async/AsyncExecutor.java

@@ -0,0 +1,60 @@
+package org.oscim.utils.async;
+
+import com.badlogic.gdx.Gdx;
+import com.badlogic.gdx.utils.Disposable;
+import com.badlogic.gdx.utils.Timer;
+
+/**
+ * GWT emulation of AsynchExecutor, will call tasks immediately :D
+ * @author badlogic
+ *
+ */
+public class AsyncExecutor implements Disposable {
+
+	/**
+	 * Creates a new AsynchExecutor that allows maxConcurrent
+	 * {@link Runnable} instances to run in parallel.
+	 * @param maxConcurrent
+	 */
+	public AsyncExecutor(int maxConcurrent) {
+	}
+
+	// FIXME TODO add wrap into 'FakeFuture' and run via Gdx.app.post()
+	/**
+	 * Submits a {@link Runnable} to be executed asynchronously. If
+	 * maxConcurrent runnables are already running, the runnable
+	 * will be queued.
+	 * @param task the task to execute asynchronously
+	 */
+	@SuppressWarnings("rawtypes")
+	public <T> AsyncResult<T> submit(final AsyncTask<T> task) {
+
+		T result = null;
+		boolean error = false;
+		try {
+			task.run();
+			result = task.getResult();
+		} catch(Throwable t) {
+			error = true;
+		}
+		return new AsyncResult(result);
+	}
+
+	/**
+	 * Submits a {@link Runnable} to be executed asynchronously. If
+	 * maxConcurrent runnables are already running, the runnable
+	 * will be queued.
+	 * @param task the task to execute asynchronously
+	 */
+	public void post(Runnable task) {
+		Gdx.app.postRunnable(task);
+	}
+	/**
+	 * Waits for running {@link AsyncTask} instances to finish,
+	 * then destroys any resources like threads. Can not be used
+	 * after this method is called.
+	 */
+	@Override
+	public void dispose () {
+	}
+}

vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/utils/async/AsyncResult.java

@@ -0,0 +1,49 @@
+/*******************************************************************************
+ * Copyright 2013 See libgdx AUTHORS file.
+ *
+ * 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.oscim.utils.async;
+
+//import java.util.concurrent.ExecutionException;
+//import java.util.concurrent.Future;
+
+
+/**
+ * Returned by {@link AsyncExecutor#submit(AsyncTask)}, allows to poll
+ * for the result of the asynch workload.
+ * @author badlogic
+ *
+ */
+public class AsyncResult<T> {
+	private final T result;
+
+	AsyncResult(T result) {
+		this.result = result;
+	}
+
+	/**
+	 * @return whether the {@link AsyncTask} is done
+	 */
+	public boolean isDone() {
+		return true;
+	}
+
+	/**
+	 * @return the result, or null if there was an error, no result, or the task is still running
+	 */
+	public T get() {
+		return result;
+	}
+}

vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/utils/async/AsyncTask.java

@@ -0,0 +1,28 @@
+/*******************************************************************************
+ * Copyright 2013 See libgdx AUTHORS file.
+ *
+ * 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.oscim.utils.async;
+
+
+/**
+ * Task to be submitted to an {@link AsyncExecutor}, returning a result of type T.
+ * @author badlogic
+ *
+ */
+public interface AsyncTask<T> extends Runnable{
+	public boolean cancel();
+	public T getResult() throws Exception;
+}

vtm-gdx-html/src/org/oscim/gdx/emu/org/oscim/utils/async/ThreadUtils.java

@@ -0,0 +1,27 @@
+/*******************************************************************************
+ * Copyright 2013 See libgdx AUTHORS file.
+ *
+ * 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.oscim.utils.async;
+
+/**
+ * GWT emulation of ThreadUtils, does nothing.
+ * @author badlogic
+ *
+ */
+public class ThreadUtils {
+	public static void yield() {
+	}
+}