The question is: When will we next freeze over?

In the city the lakes freeze over as well.

在市内，大小湖泊也全面封冻了。

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Each factory has an associated free connection pool.

每个工厂都有一个关联的空闲连接池。

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But how does the free connection pool actually work?

但空闲连接池的实际工作原理是什么？

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If a connection is in the free pool, and the elapsed time since its creation is greater than the value of the connection pool's Aged timeout property, then it is closed regardless of how long it has been since it was last used.

如果连接位于空闲池中，并且自创建以来所经过的时间大于连接池的过时超时属性的值，则将关闭该连接，无论该连接自最后一次使用以来已存在多长时间。

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To understand how the pool maintenance thread works, return to the EJB example ( you could also use MDBs and listener ports, as all you really need is a way to get connections in the free pool).

要了解池维护线程如何工作，请返回到EJB示例（可能还要使用MDB和侦听器端口，因为实际需要的是获得空闲池中连接的方法）。

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When an application has finished with the connection and closes it by calling connection. close(), the connection is actually left open, and is returned to the free pool so that it can be reused by another application.

应用程序完成连接并通过调用connection.close（）将其关闭后，该连接实际上处于打开状态，并返回给空闲池，这样另一个应用程序就可以重新使用它。

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By default, if a connection is put back in the free pool and not used again for at least 30 minutes, it is closed, provided that closing it will leave at least one connection in the free pool.

在缺省情况下，如果连接放回空闲池中并且至少30分钟没有再使用它，并且关闭该连接后，空闲池中至少还保留一个连接，则将关闭该连接。

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Connections that have been around for longer than the Aged timeout property are discarded regardless of how many connections will be left in the free pool& the Minimum connections property does not come into play here.

超过过时超时属性的连接将被丢弃，无论空闲池中还剩多少连接&最小连接属性这时不起作用。

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If the connection has not been used for a period longer than the value of the connection pool's Unused timeout property, the maintenance thread checks the number of connections currently in the free pool.

如果连接未使用的时间超过连接池的未使用超时属性指定的值，则维护线程会检查当前空闲池中的连接数。

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The max-beans-in-free-pool element defines the maximum size of the free pool of EJBs for a specific entity bean, stateless session bean, or message-driven bean.

max-beans-in-free-pool元素定义了特定实体bean、无状态会话bean或消息驱动bean的EJB空闲池的最大大小。

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If a connection is put back in the free pool within this 3-minute period, the Connection Manager immediately takes it out of the pool again and passes it to the application.

如果在这3分钟内将连接放回空闲池，则Connection Manager将立即从池中再次取出它，并将其传递给应用程序。

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The listener port requests a connection from the Connection Manager, which looks in the free pool for jms/ CF1 and finds that it is empty.

侦听器端口从Connection Manager请求连接，Connection Manager在空闲池中查找jms/CF1，并发现空闲池为空。

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You now have a connection c1 in the free pool, so the Connection Manager will take this connection out of the pool and make it available to the listener port.

现在，空闲池中含有连接c1，这样Connection Manager将从该池中取出此连接，并将其提供给侦听器端口。

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The default value of the Minimum connections property is 1, which means that the Connection Manager will always try to keep at least one connection in the free pool, for performance reasons.

最小连接属性的缺省值为1，这意味着Connection Manager出于性能原因将总是尝试在空闲池中至少保持一个连接。

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If the pool maintenance thread decides that a connection in the free pool needs to be discarded, it physically closes the connection to the JMS provider.

如果池维护线程确定需要丢弃空闲池中的连接，则它物理关闭到JMS提供程序的连接。

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Three minutes have passed since the connection was put in the free pool, which is less than the value of the Unused timeout property for jms/ CF1.

从将连接放入空闲池起已经超过三分钟，这小于jms/CF1的未使用超时属性的值。

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The initial-beans-in-free-pool element defines the initial number of bean instances that will populate the free pool for a specific bean class at startup.

initial-beans-in-free-pool元素定义了在启动时为特定bean类填充空闲池的bean实例的初始大小。

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As the free pool for this factory is empty, the Connection Manager creates a new connection, c1, and returns it to the application.

因为此工厂的空闲池为空，所以Connection Manager会创建新的连接c1，并将其返回给应用程序。

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A block is allocated from the free pool by first converting the requested bytes to an index in the bucket array, using the following equation

当从空闲池分配块时，首先使用以下公式把请求的字节数转换为bucket数组索引

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Populating the free pool with instances improves initial response time, because initial requests for the bean can be satisfied without generating a new instance.

用实例来填充空闲池可以提高初始响应时间，因为对该bean的初始请求不用生成新的实例即可得到满足。

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