okhttp系列-execute过程

lostfish1232023-11-29 12:20

1.RealCall.execute

java 复制代码

final class RealCall implements Call {
    @Override 
    public Response execute() throws IOException {
        synchronized (this) {
      i    if (executed) throw new IllegalStateException("Already Executed");
          executed = true;
        }
        transmitter.timeoutEnter();
        transmitter.callStart();
        try {
            client.dispatcher().executed(this); //1.调用Dispatcher的executed
            return getResponseWithInterceptorChain();//2调用getResponseWithInterceptorChain
        } finally {
            client.dispatcher().finished(this); //3.结束
        }
    }
}

1.1.Dispatcher.executed

将call加入runningSyncCalls

java 复制代码

public final class Dispatcher {
    private final Deque<RealCall> runningSyncCalls = new ArrayDeque<>();

    synchronized void executed(RealCall call) {
        runningSyncCalls.add(call);
    }
}

1.2.RealCall.getResponseWithInterceptorChain

执行请求后返回结果

java 复制代码

final class RealCall implements Call {
    Response getResponseWithInterceptorChain() throws IOException {
        Interceptor.Chain chain = new RealInterceptorChain(interceptors, transmitter, 
        null, 0, originalRequest, this, client.connectTimeoutMillis(),
        client.readTimeoutMillis(), client.writeTimeoutMillis());

        Response response = chain.proceed(originalRequest); //执行拦截器
        return response; //返回结果
    }
}

1.3.Dispatcher.finished

从runningSyncCalls移除call；

执行下一个call；

java 复制代码

public final class Dispatcher {
    void finished(RealCall call) {
        finished(runningSyncCalls, call);
    }

    private <T> void finished(Deque<T> calls, T call) {
        Runnable idleCallback;
        synchronized (this) {
            //将call从calls移除
            if (!calls.remove(call)) throw new AssertionError("Call wasn't in-flight!");
            idleCallback = this.idleCallback;
        }

        boolean isRunning = promoteAndExecute(); //执行下一个call

        if (!isRunning && idleCallback != null) {//如果没有要执行的call，调用idleCallback
            idleCallback.run(); 
        }
    }
}

1.4.总结

将RealCall添加到runningSyncCalls
调用getResponseWithInterceptorChain执行
finally里执行

从将RealCall从runningSyncCalls移除

调用promoteAndExecute，执行其他的AsyncCall