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Diffstat (limited to 'java/com/android/dialer/common/AsyncTaskExecutor.java')
-rw-r--r-- | java/com/android/dialer/common/AsyncTaskExecutor.java | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/java/com/android/dialer/common/AsyncTaskExecutor.java b/java/com/android/dialer/common/AsyncTaskExecutor.java new file mode 100644 index 000000000..caadfe7ce --- /dev/null +++ b/java/com/android/dialer/common/AsyncTaskExecutor.java @@ -0,0 +1,51 @@ +/* + * Copyright (C) 2011 The Android Open Source Project + * + * 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 com.android.dialer.common; + +import android.os.AsyncTask; +import android.support.annotation.MainThread; +import java.util.concurrent.Executor; + +/** + * Interface used to submit {@link AsyncTask} objects to run in the background. + * + * <p>This interface has a direct parallel with the {@link Executor} interface. It exists to + * decouple the mechanics of AsyncTask submission from the description of how that AsyncTask will + * execute. + * + * <p>One immediate benefit of this approach is that testing becomes much easier, since it is easy + * to introduce a mock or fake AsyncTaskExecutor in unit/integration tests, and thus inspect which + * tasks have been submitted and control their execution in an orderly manner. + * + * <p>Another benefit in due course will be the management of the submitted tasks. An extension to + * this interface is planned to allow Activities to easily cancel all the submitted tasks that are + * still pending in the onDestroy() method of the Activity. + */ +public interface AsyncTaskExecutor { + + /** + * Executes the given AsyncTask with the default Executor. + * + * <p>This method <b>must only be called from the ui thread</b>. + * + * <p>The identifier supplied is any Object that can be used to identify the task later. Most + * commonly this will be an enum which the tests can also refer to. {@code null} is also accepted, + * though of course this won't help in identifying the task later. + */ + @MainThread + <T> AsyncTask<T, ?, ?> submit(Object identifier, AsyncTask<T, ?, ?> task, T... params); +} |