HttpComponents PoolingHttpClientConnectionManager maxPerRoute和maxTotal？

问题描述

有人可以向我解释一下 setMaxPerRoute（max）和 setMaxTotal（max）参考HttpComponents PoolingHttpClientConnectionManager？

Can someone please explain to me what setMaxPerRoute(max) and setMaxTotal(max) do in reference to HttpComponents PoolingHttpClientConnectionManager?

推荐答案

这些设置控制连接池大小。

These settings control connection pool size.

• setMaxTotal（max）定义连接池的总连接限制。


• setMaxPerRoute（max）定义每条HTTP路由的连接限制。在简单的情况下，您可以将其理解为每个目标主机限制。引擎盖下的东西更有趣： HttpClient 维护一些 HttpRoute 对象，它们代表一系列主机每个，如 proxy1 - > proxy2 - > targetHost 。连接按路由汇集。在简单的情况下，当您使用默认路由构建机制并且不提供代理支持时，您的路由可能仅包括目标主机，因此每个路由连接池限制实际上变为每个主机限制。

• setMaxTotal(max) defines the overal connection limit for a conneciton pool.
• setMaxPerRoute(max) defines a connection limit per one HTTP route. In simple cases you can understand this as a per target host limit. Under the hood things are a bit more interesting: HttpClient maintains a couple of HttpRoute objects, which represent a chain of hosts each, like proxy1 -> proxy2 -> targetHost. Connections are pooled on per-route basis. In simple cases, when you're using default route-building mechanism and provide no proxy suport, your routes are likely to include target host only, so per-route connection pool limit effectively becomes per-host limit.

示例：

假设你有 setMaxPerRoute（5）和 setMaxTotal（20）。这意味着您可以同时为每个目标主机使用最多5个连接：5个与google.com的连接，另外5个与oracle.com的连接，依此类推。但是，无论您正在与之通信的主机数量是多少，打开的连接总数都不能超过20个。

Suppose you have setMaxPerRoute(5) and setMaxTotal(20). That means you can simultameously use up to 5 connections for every target host: 5 connections with google.com, another 5 connections with oracle.com and so on. The total amount of open connections can't however exceed 20 regardless of the number of hosts you're communicating with.

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