okhttp类图2

Request

+HttpUrl url;+String method;+Headers headers;+RequestBody body;+Object tag;

+ 。。。一些请求信息包括请求类型get or post 请求头、请求body。。

用于构建web应用时使用，它可以在浏览器和服务器之间提供基于tcp链接的双向通道

ConnectionPool

涉及到同步，较复杂

c.RealCall通过RealInterceptorChain循环调用RetryAndFollowUpInterceptor、ConnectInterceptor、CallServerInterceptor的process()，最后由CallServerInterceptor的process()调用Http1Codec进行调用okIO库，进行网络请求

RetryAndFollowUpInterceptor

+ OkHttpClient client;+StreamAllocation streamAllocation;

+ operation1(params):returnType- operation2(params)- operation3()

StreamAllocation

通过trustRootIndex获取出所有证书，并验证他们的有效性

Interceptor

+ Response intercept(Chain chain)

Dispatcher

-ExecutorService executorService;-Deque readyAsyncCalls-Deque runningAsyncCalls-Deque runningSyncCalls

#synchronized void enqueue(AsyncCall call) 异步#synchronized void executed(RealCall call)同步+synchronized void cancelAll()

拦截器，用于对请求、响应、和链接进行拦截

ConnectInterceptor

OkHttpClient

+ Internal.instance+ List DEFAULT_PROTOCOLS+List DEFAULT_CONNECTION_SPECS#Dispatcher dispatcher;#Proxy proxy;#List protocols;#List connectionSpecs;#List interceptors;#List networkInterceptors;#ProxySelector proxySelector;系统类#CookieJar cookieJar;#Cache cache;#InternalCache internalCache;#SocketFactory socketFactory;系统类用于创建socket#SSLSocketFactory sslSocketFactory;系统类用于创建SSLSocket#CertificateChainCleaner certificateChainCleaner;#Authenticator proxyAuthenticator;#Authenticator authenticator;#ConnectionPool connectionPool;#Dns dns;

+Builder sslSocketFactory(SSLSocketFactory sslSocketFactory) +Call newCall(Request request)

MediaType

+ 。。。

给Cache类提供了对缓存内容的增删改查功能

Call

Request request()Response execute()void enqueue(Callback responseCallback)void cancel()boolean isExecuted();boolean isCanceled();Call clone();

RealInterceptorChain

CookieJar

AndroidPlatform

-Class sslParametersClass;-OptionalMethod setUseSessionTickets;-OptionalMethod setHostname;

AndroidTrustRootIndex

+X509Certificate findByIssuerAndSignature(X509Certificate cert)

Jdk9Platform

a.调用时，new一个OkHttpClient对象，再new一个Request对象，然后配合调用OKhttpClient的newCall方法，获得一个Call的子类对象RealCall，在执行Call的execute（）或者enqueue（）进行网络请求

根据域名查询ip

包含了子类AndroidTrustRootIndex和子类BasicTrustRootIndex，用户根据某证书查询相同作者的相关证书调用get()方法返回new AndroidTrustRootIndex对象

Cloneable

系统克隆接口

调度器，拥有一个线程池和一些线程配置策略，用于执行网络请求Call的子类对象

Factory

newWebSocket（）

JdkWithJettyBootPlatform

CacheControl

+。。。

+。。。缓存控制策略

TrustRootIndex

#X509Certificate findByIssuerAndSignature(X509Certificate cert);+TrustRootIndex get(X509TrustManager trustManager)+TrustRootIndex get(X509Certificate... caCerts)

Cache

# InternalCache internalCache = new InternalCache()#DiskLruCache cache;

Authenticator

该子类的trustManager()被调用，返回对应的Manager，因为每个平台中获取X509TrustManager的对应类不同

Internal

+ Internal+ addLenient+setCache+Socket deduplicate();+。。。

Protocol

DiskLruCache

很复杂

很多方法

Dns

+ List lookup(String hostname)

okHttp升级版API

根据response返回一个带权限认证的request

Flushable

+ void flush() throws IOException;提供输出到stream的功能

https 链接策略组

BasicCertificateChainCleaner

-TrustRootIndex trustRootIndex;

Headers

+ 。。。http请求头信息

Platform

+ Platform PLATFORM = findPlatform();

+ findPlatform()创建时自动返回匹配Android、jdk9、jdkWithJettyBoot的平台，见其3个子类+X509TrustManager trustManager(SSLSocketFactory sslSocketFactory)+CertificateChainCleaner buildCertificateChainCleaner(X509TrustManager trustManager)返回BasicCertificateChainCleaner对象

Call newCall(Request request);

CallServerInterceptor

从response中提取保存cookie，给request添加cookie

InternalCache

X509TrustManager

不同平台有不同的实现

最近最少使用原则的文件缓存操作实现类，通过线程池实现

Proxy

-Type type;-SocketAddress sa;

...

将对应平台的X509TrustManager对象传入TrustRootIndex的具体子类，得到AndroidTrustRootIndex对象在将其传入BasicCertificateChainCleaner得到CertificateChainCleaner的子类对象

通过反射，执行其X509TrustManager的具体对象的findTrustAnchorByIssuerAndSignature()返回一个X509Certificate对象

RealCall

+ OkHttpClient client;+RetryAndFollowUpInterceptor retryAndFollowUpInterceptor;+Request originalRequest;

+ Response execute()+void enqueue(Callback responseCallback) +Response getResponseWithInterceptorChain()

HttpUrl

+ 。。。构建一个请求URL

RequestBody

+ 。。。标记content的类型、内容、size

代理类，包含了代理策略（无代理、http、代理、socket代理）和一个socket地址

Chain

+ Request request();+Response proceed(Request request) +Connection connection();

ConnectionSpec

-CipherSuite[] APPROVED_CIPHER_SUITES;+ConnectionSpec MODERN_TLS;+ConnectionSpec COMPATIBLE_TLS;+ConnectionSpec CLEARTEXT;

CertificateChainCleaner

通过OkHttpClient的sslSocketFactory()对它的certificateChainCleaner属性赋值

连接池类，复用http、http2链接，减少网络延迟

b.调用者执行execute()或者enqueue()时最终都会调用getResponseWithInterceptorChain（）获取请求结果，该方法中调用了RetryAndFollowUpInterceptor、BridgeInterceptor、CacheInterceptor、ConnectInterceptor、CallServerInterceptor

okHttp3类图

证书清理者，过滤出授信任的证书，调用get()通过Platform获取X509TrustManager，根据Manager对象，获得CertificateChainCleaner对象

WebSocket

request()send()close()cancel()