Andoridjar库源码Bolts原理解析

Bolts：
　　作用：
　　　　用于链式执行跨线程代码，且传递数据

　　栗子：

Task.call(new Callable() {
@Override
public Boolean call() throws Exception {
return true;
}
}, Task.UI_THREAD_EXECUTOR);

Task.callInBackground(new Callable() {
@Override
public Boolean call() throws Exception {
return false;
}
});

Task.callInBackground(new Callable() {
@Override
public Boolean call() throws Exception {
return true;
}
}).onSuccess(new Continuation() {
@Override
public Object then(Task task) throws Exception {
if (task.getResult()) {
return null;
} else {
return new Object();
}
}
}, Task.BACKGROUND_EXECUTOR).continueWith(new Continuation() {
@Override
public Object then(Task task) throws Exception {
if (task.getResult() == null) {
Toast.makeText(getBaseContext(), "null", Toast.LENGTH_SHORT).show();
} else {
Toast.makeText(getBaseContext(), "not null", Toast.LENGTH_SHORT).show();
}

return null;
}
}, Task.UI_THREAD_EXECUTOR);

　　源码解读：
　　在内部通过维护多中 ExecutorService 对象，并且通过串联的方式进行调用。

　　并且通过维护内部变量在，在指定流程处，就是特定的，值，值通过Task的对象getResult拿到。

　　UIThread

/**
* An {@link java.util.concurrent.Executor} that runs tasks on the UI thread.
*/
private static class UIThreadExecutor implements Executor {
@Override
public void execute(Runnable command) {
new Handler(Looper.getMainLooper()).post(command);
}
}

　　BackgroundThread

private BoltsExecutors() {
background = !isAndroidRuntime()
&＃63; java.util.concurrent.Executors.newCachedThreadPool()
: AndroidExecutors.newCachedThreadPool();
scheduled = Executors.newSingleThreadScheduledExecutor();
immediate = new ImmediateExecutor();
}

　　源码：https://github.com/BoltsFramework/Bolts-Android
　　引入：
implementation 'com.parse.bolts:bolts-android:1.2.0'以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。