ListenableFuture继承了java.util.concurrent.Future，它定义了done、abort、touch、addListener、toCompletableFuture方法

SignatureCalculator定义了calculateAndAddSignature接口，它首先计算签名，然后添加到requestBuilder

ClientStats通过Map<String, HostStats>维护了每个host对应的统计；它提供了getStatsPerHost、getTotalConnectionCount、getTotalActiveConnectionCount、getTotalIdleConnectionCount方法

序本文主要研究一下AsyncHttpClient的TimeoutTimerTaskTimerTaskio/netty/util/TimerTask.java {代码...} netty的TimerTask接口定义了run方法，其入参为TimeoutTimeoutio/netty/util/Timeout.java {代码...} Timeout接口定义了timer()、task()、isExpired()、isCancelled()、cancel()方法TimeoutTimerTaskorg/asynchttpc...

序本文主要研究一下AsyncHttpClient的IOExceptionFilterIOExceptionFilterorg/asynchttpclient/filter/IOExceptionFilter.java {代码...} IOExceptionFilter接口定义了filter方法，在捕获到IOException的时候执行ResumableIOExceptionFilterorg/asynchttpclient/handler/resumable/ResumableIOExceptionFilter.java {代...

序本文主要研究一下AsyncHttpClient的RequestFilterRequestFilterorg/asynchttpclient/filter/RequestFilter.java {代码...} RequestFilter定义了filter方法ThrottleRequestFilterorg/asynchttpclient/filter/ThrottleRequestFilter.java {代码...} ThrottleRequestFilter实现了RequestFilter接口，它使用Semaphore来对r...

序本文主要研究一下AsyncHttpClient的KeepAliveStrategyKeepAliveStrategyorg/asynchttpclient/channel/KeepAliveStrategy.java {代码...} KeepAliveStrategy接口定义了keepAlive方法用于决定是否对该connection进行keep aliveDefaultKeepAliveStrategyorg/asynchttpclient/channel/DefaultKeepAliveStrategy.java {代码...

序本文主要研究一下AsyncHttpClient的exceptionChannelClosedExceptionorg/asynchttpclient/exception/ChannelClosedException.java {代码...} ChannelClosedException用于表示Channel closed的异常handleUnexpectedClosedChannelorg/asynchttpclient/netty/request/NettyRequestSender.java {代码...} NettyRequestSend...

ChannelPool定义了offer、poll、removeAll、isOpen、destroy、flushPartitions、getIdleChannelCountPerHost方法，它有两个实现类，分别是NoopChannelPool及DefaultChannelPool

ConnectionSemaphore主要用于控制连接的maxConnections及maxConnectionsPerHost；它定义了freeChannels表示可用连接的信号量，定义了freeChannelsPerHost维护每个host的可用连接新用量，类型是NonBlockingSemaphoreLike；它提供了tryAcquireGlobal用于获取全局的空闲连接，tryAcquirePerHost用于获取指定host的空闲连接...

AsyncHttpClientConfig接口定义了一系列获取配置的接口，比如getMaxConnections、getConnectTimeout、getReadTimeout、getPooledConnectionIdleTimeout等

序本文主要研究一下httpclient的ConnectionHolderConnectionReleaseTriggerorg/apache/http/conn/ConnectionReleaseTrigger.java {代码...} ConnectionReleaseTrigger定义了releaseConnection、abortConnection方法ConnectionHolderorg/apache/http/impl/execchain/ConnectionHolder.java {代码...} ConnectionHolder实...

HttpClientConnectionOperator定义了connect及upgrade方法，它有一个默认的实现类为DefaultHttpClientConnectionOperator

AbstractConnPool提供了getPoolEntryBlocking，lease内部就是通过这个方法来获取连接的。它主要是通过pool.getFree获取空闲连接，然后进行过期判断，再判断是否close，如果已经close则从available中移除，获取成功的话则从available移除，添加到leased然后返回。如果获取不到则先判断连接是否超出maxPerRoute，超出则先...

RequestConfig定义了staleConnectionCheckEnabled属性，在4.4版本废弃了，默认为false，替换设置是org.apache.http.impl.conn.PoolingHttpClientConnectionManager.setValidateAfterInactivity(int)；Builder方法也提供了setStaleConnectionCheckEnabled方法

HttpClientBuilder提供了disableConnectionState方法可以设置connectionStateDisabled为true，在该值为true时userTokenHandlerCopy为NoopUserTokenHandler.INSTANCE，而userTokenHandlerCopy是作为创建ClientExecChain(MainClientExec)的参数之一

AbstractConnPool定义了validateAfterInactivity属性，与defaultMaxPerRoute、maxTotal不同，该属性没有在构造器参数中，而是提供了setter来设置

序本文主要研究一下HttpClient的closeCloseableHttpClientorg/apache/http/impl/client/CloseableHttpClient.java {代码...} CloseableHttpClient声明实现HttpClient, Closeable接口InternalHttpClientorg/apache/http/impl/client/InternalHttpClient.java {代码...} InternalHttpClient继承了CloseableHttpClient，其...

RedirectStrategy接口定义了isRedirected方法用于判断是否需要redirect，还定义了getRedirect方法用于返回redirect的目标地址

序本文主要研究一下HttpClient的DnsResolverDnsResolverorg/apache/http/conn/DnsResolver.java {代码...} DnsResolver定义了resolve方法，可用于替换OS提供的DNS lookupInMemoryDnsResolverorg/apache/http/impl/conn/InMemoryDnsResolver.java {代码...} InMemoryDnsResolver实现了DnsResolver接口，它用一个Concurren...

序本文主要研究一下HttpClient的HttpRoutePlannerHttpRoutePlannerorg/apache/http/conn/routing/HttpRoutePlanner.java {代码...} HttpRoutePlanner接口定义了determineRoute方法，用于决定该请求的目标routeDefaultRoutePlannerorg/apache/http/impl/conn/DefaultRoutePlanner.java {代码...} DefaultRoutePlanner实现...

BackoffManager接口主要用于根据connection的情况来动态调整连接池的connection大小，它定义了backOff方法用于缩小连接数，probe方法用于扩大连接数

序本文主要研究一下HttpClient的ConnectionBackoffStrategyConnectionBackoffStrategyorg/apache/http/client/ConnectionBackoffStrategy.java {代码...} ConnectionBackoffStrategy定义了shouldBackoff方法，它根据异常或者response来进行判断NullBackoffStrategyorg/apache/http/impl/client/NullBackoffStrategy.java...

ServiceUnavailableRetryStrategy定义了retryRequest方法用于返回是否该重试，getRetryInterval返回自动重试的间隔

HttpRequestRetryHandler接口定义了retryRequest方法，它接收IOException、executionCount及context，然后判断是否可以重试

序本文主要研究一下HttpClient的NoHttpResponseExceptionNoHttpResponseExceptionorg/apache/http/NoHttpResponseException.java {代码...} NoHttpResponseException继承了IOException，用于表示目标服务器没有返回一个正常的http responseDefaultHttpResponseParserorg/apache/http/impl/conn/DefaultHttpResponseParse...

ConnectionKeepAliveStrategy接口定义了getKeepAliveDuration方法，用于返回该connection空间多久以内被复用是安全的

序本文主要研究一下HttpClient的ResponseHandlerResponseHandlerorg/apache/http/client/ResponseHandler.java {代码...} ResponseHandler定义了handleResponse方法，用于解析HttpResponse到泛型TAbstractResponseHandlerorg/apache/http/impl/client/AbstractResponseHandler.java {代码...} AbstractResponseHandler声...

org/springframework/http/client/HttpComponentsClientHttpRequestFactory.java

micrometer-core-1.3.0-sources.jar!/io/micrometer/core/instrument/binder/httpcomponents/MicrometerHttpRequestExecutor.java