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115 lines
2.6 KiB
115 lines
2.6 KiB
/*
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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package codetoanalyze.java.checkers;
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import android.support.annotation.MainThread;
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import android.support.annotation.UiThread;
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import android.support.annotation.WorkerThread;
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import java.lang.annotation.ElementType;
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import java.lang.annotation.Retention;
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import java.lang.annotation.RetentionPolicy;
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import java.lang.annotation.Target;
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@Target({ElementType.METHOD})
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@Retention(RetentionPolicy.CLASS)
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@interface AnyThread {}
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/*
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Sources:
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https://developer.android.com/reference/android/support/annotation/UiThread
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"Denotes that the annotated method or constructor should only be called on the UI thread."
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https://developer.android.com/reference/android/support/annotation/MainThread
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"Denotes that the annotated method should only be called on the main thread."
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"Note: Ordinarily, an app's main thread is also the UI thread."
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(this is what's assumed here also)
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https://developer.android.com/reference/android/support/annotation/WorkerThread
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"Denotes that the annotated method should only be called on a worker thread."
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https://developer.android.com/reference/android/support/annotation/AnyThread
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"Denotes that the annotated method can be called from any thread (e.g. it is "thread safe".) [...]
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static tools can then check that nothing you call from within this method or class have more
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strict threading requirements."
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*/
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public class UiThreads {
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@UiThread
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void uiThread() {}
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@MainThread
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void mainThread() {}
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@AnyThread
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void anyThread() {}
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@WorkerThread
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void workerThread() {}
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void unannotated() {}
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void callUiThreadMethod() {
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uiThread();
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mainThread();
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}
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void callNonUiThreadMethod() {
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workerThread();
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}
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@UiThread
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void callsFromUiThreadBad() {
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callNonUiThreadMethod();
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}
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@UiThread
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void callsFromUiThreadOk() {
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callUiThreadMethod();
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anyThread();
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unannotated();
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}
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@MainThread
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void callsFromMainThreadBad() {
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callNonUiThreadMethod();
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}
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@MainThread
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void callsFromMainThreadOk() {
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callUiThreadMethod();
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anyThread();
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unannotated();
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}
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@WorkerThread
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void callsFromWorkerThreadBad() {
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callUiThreadMethod();
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}
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@WorkerThread
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void callsFromWorkerThreadOk() {
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callNonUiThreadMethod();
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anyThread();
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unannotated();
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}
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@AnyThread
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void callsFromAnyThreadBad() {
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callUiThreadMethod();
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callNonUiThreadMethod();
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}
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@AnyThread
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void callsFromAnyThreadOk() {
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anyThread();
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unannotated();
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}
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}
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