Android 源码分析之okhttp3（builder二）

2023年12月18日 192次阅读 来源: Android源码分析

上篇博客简单地介绍了一下builder设计模式，其实也很简单，相信聪明的你能很快理解他的精髓，这篇就来说说okhttp3的设计模式，其实也是builder模式，只不过和alertdialog有点小小的区别，这个区别就是在成员变量位置，ok3没有对成员变量进行封装，而alertdialog将成员变量封装到了一个含有内部类的类中了；
下面先看下ok3的代码：


                OkHttpClient okHttpClient = new OkHttpClient.Builder()
                        .connectTimeout(5, TimeUnit.SECONDS)
                        .cache(null)
                        .build();

                okHttpClient.newCall(null).enqueue(new Callback() {
                    @Override
                    public void onFailure(Call call, IOException e) {

                    }

                    @Override
                    public void onResponse(Call call, Response response) throws IOException {

                    }
                });

1 okhttpclient类的结构
大致分为三部分，成员变量（okhttpclient），内部类（builder）和内部类的的区部变量（builder）三部分；这里我就简单地写下：（看源码不要走进一个误区，非要看懂每一行代码的话那你就比高司令还厉害了，能看懂70%你就了不得了）

public class OkHttpClient{
//变量太多就不全部粘贴出来了
  final boolean followRedirects;
  final boolean retryOnConnectionFailure;
  final int connectTimeout;
  final int readTimeout;
  final int writeTimeout;
  final int pingInterval;


//各种get和set方法，此处省略一万字，你懂得

  OkHttpClient(Builder builder) {
      this.followRedirects = builder.followRedirects;
    this.retryOnConnectionFailure = builder.retryOnConnectionFailure;
    this.connectTimeout = builder.connectTimeout;
    this.readTimeout = builder.readTimeout;
    this.writeTimeout = builder.writeTimeout;
    this.pingInterval = builder.pingInterval;
  }

//内部类builder
public static final class Builder {

    boolean followRedirects;
    boolean retryOnConnectionFailure;
    int connectTimeout;
    int readTimeout;
    int writeTimeout;
    int pingInterval;


public Builder() {

      followSslRedirects = true;
      followRedirects = true;
      retryOnConnectionFailure = true;
      connectTimeout = 10_000;
      readTimeout = 10_000;
      writeTimeout = 10_000;
      pingInterval = 0;
    }
 public Builder connectionPool(ConnectionPool connectionPool) {
      if (connectionPool == null) throw new NullPointerException("connectionPool == null");
      this.connectionPool = connectionPool;
      return this;
    }
 //类似方法省略

public OkHttpClient build() {
      return new OkHttpClient(this)；//这里直接将builder对象传入构造中，在okhttpclient的构造方法中将builder的变量取出赋值给okhttpclient的成员变量
    }
}
}
}

2 newcall方法

/** 源码里面是这样的， * Prepares the {@code request} to be executed at some point in the future. */
  @Override public Call newCall(Request request) {
    return new RealCall(this, request, false /* for web socket */);
  }


//后面调用这个方法，他是而这个方法里面的关键就是AsyncCall，进行请求

  @Override public void enqueue(Callback responseCallback) {
    synchronized (this) {
      if (executed) throw new IllegalStateException("Already Executed");
      executed = true;
    }
    captureCallStackTrace();
    client.dispatcher().enqueue(new AsyncCall(responseCallback));
  }





我们再来看看Callback是干嘛的：
void onFailure(Call call, IOException e);
void onResponse(Call call, Response response) throws IOException;
原来是一个回调接口；

2 request

Request request = new Request.Builder()
                        .get()
                        .build();

也是一个builder模式；

    原文作者：Android源码分析
    原文地址: https://blog.csdn.net/qq_33451004/article/details/53870228
    本文转自网络文章，转载此文章仅为分享知识，如有侵权，请联系博主进行删除。
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