java HttpClient 中的 setDefaultMaxPerRoute 和 setMaxTotal 是什么意思？
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What does setDefaultMaxPerRoute and setMaxTotal mean in HttpClient?
提问by john
I am using Apache HttpClient in one of my project. I am also using PoolingHttpClientConnectionManageralong with my HttpClient as well.
我在我的一个项目中使用 Apache HttpClient。我也PoolingHttpClientConnectionManager与我的 HttpClient 一起使用。
I am confuse what are these properties mean. I tried going through documentation in the code but I don't see any documentation around these variables so was not able to understand.
我很困惑这些属性是什么意思。我尝试查看代码中的文档，但没有看到有关这些变量的任何文档，因此无法理解。
- setMaxTotal
- setDefaultMaxPerRoute
- setConnectTimeout
- setSocketTimeout
- setConnectionRequestTimeout
- setStaleConnectionCheckEnabled
- 设置最大总计
- setDefaultMaxPerRoute
- 设置连接超时
- 设置套接字超时
- 设置连接请求超时
- setStaleConnectionCheckEnabled
Below is how I am using in my code:
以下是我在代码中的使用方式：
RequestConfig requestConfig = RequestConfig.custom().setConnectTimeout(5 * 1000).setSocketTimeout(5 * 1000)
.setStaleConnectionCheckEnabled(false).build();
PoolingHttpClientConnectionManager poolingHttpClientConnectionManager = new PoolingHttpClientConnectionManager();
poolingHttpClientConnectionManager.setMaxTotal(200);
poolingHttpClientConnectionManager.setDefaultMaxPerRoute(20);
CloseableHttpClient httpClientBuilder = HttpClientBuilder.create()
.setConnectionManager(poolingHttpClientConnectionManager).setDefaultRequestConfig(requestConfig)
.build();
Can anyone explain me these properties so that I can understand and decide what values I should put in there. Also, are there any other properties that I should use apart from as shown above to get better performance?
任何人都可以向我解释这些属性，以便我可以理解并决定我应该在其中放入哪些值。另外，除了上面显示的之外，我还应该使用其他任何属性来获得更好的性能吗？
I am using http-client 4.3.1
我正在使用 http 客户端 4.3.1
采纳答案by Pace
Some parameters are explained at http://hc.apache.org/httpclient-3.x/preference-api.html
在http://hc.apache.org/httpclient-3.x/preference-api.html解释了一些参数
Others must be gleaned from the source.
其他的必须从源头收集。
- setMaxTotal
- 设置最大总计
The maximum number of connections allowed across all routes.
所有路由允许的最大连接数。
- setDefaultMaxPerRoute
- setDefaultMaxPerRoute
The maximum number of connections allowed for a route that has not been specified otherwise by a call to setMaxPerRoute. Use setMaxPerRoute when you know the route ahead of time and setDefaultMaxPerRoute when you do not.
未通过调用 setMaxPerRoute 指定的路由所允许的最大连接数。当您提前知道路由时使用 setMaxPerRoute，当您不知道时使用 setDefaultMaxPerRoute。
- setConnectTimeout
- 设置连接超时
How long to wait for a connection to be established with the remote server before throwing a timeout exception.
在抛出超时异常之前等待与远程服务器建立连接的时间。
- setSocketTimeout
- 设置套接字超时
How long to wait for the server to respond to various calls before throwing a timeout exception. See http://docs.oracle.com/javase/1.5.0/docs/api/java/net/SocketOptions.html#SO_TIMEOUTfor details.
在抛出超时异常之前等待服务器响应各种调用的时间。有关详细信息，请参阅http://docs.oracle.com/javase/1.5.0/docs/api/java/net/SocketOptions.html#SO_TIMEOUT。
- setConnectionRequestTimeout
- 设置连接请求超时
How long to wait when trying to checkout a connection from the connection pool before throwing an exception (the connection pool won't return immediately if, for example, all the connections are checked out).
在抛出异常之前尝试从连接池签出连接时等待多长时间（例如，如果所有连接都被签出，则连接池不会立即返回）。
- setStaleConnectionCheckEnabled
- setStaleConnectionCheckEnabled
Can be disabled for a slight performance improvement at the cost of potential IOExceptions. See http://hc.apache.org/httpclient-3.x/performance.html#Stale_connection_check
可以以潜在的 IOExceptions 为代价禁用以稍微提高性能。见http://hc.apache.org/httpclient-3.x/performance.html#Stale_connection_check
