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Andorid jar库源码Bolts原理解析

程序员文章站 2022-11-23 17:19:19
bolts:  作用:    用于链式执行跨线程代码,且传递数据  栗子:复制代码task.call(new callable() {@overridepublic bo...

bolts:
  作用:
    用于链式执行跨线程代码,且传递数据

  栗子:
复制代码
task.call(new callable<boolean>() {
@override
public boolean call() throws exception {
return true;
}
}, task.ui_thread_executor);

task.callinbackground(new callable<boolean>() {
@override
public boolean call() throws exception {
return false;
}
});

task.callinbackground(new callable<boolean>() {
@override
public boolean call() throws exception {
return true;
}
}).onsuccess(new continuation<boolean, object>() {
@override
public object then(task<boolean> task) throws exception {
if (task.getresult()) {
return null;
} else {
return new object();
}
}
}, task.background_executor).continuewith(new continuation<object, object>() {
@override
public object then(task<object> 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);
复制代码
  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

复制代码
/**
* 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);
}
}
复制代码
  backgroundthread

复制代码
private boltsexecutors() {
background = !isandroidruntime()
? java.util.concurrent.executors.newcachedthreadpool()
: androidexecutors.newcachedthreadpool();
scheduled = executors.newsinglethreadscheduledexecutor();
immediate = new immediateexecutor();
}
复制代码
  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。