欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页  >  移动技术

Andorid jar库源码Bolts原理解析

程序员文章站 2022-05-14 16:30:27
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。