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首先引用一段对Spring Container Hierarchy的理解 引用The Spring framework is used as a general application framework. The objects making up the application are being wired up by the Spring framework based on a number of XML configuration files, generally one per layer. The Spring ContextSingletonBeanFactoryLocato ...
简言之,XWork-Spring 的 Container Hierarchy 按照从 parent 到 child 的顺序依次为: application-scope containers,session-scope containers , request-scope containers。详细解释如下(源自:http://jira.opensymphony.com/browse/XOP-1): 引用The following describes how the spring container hierarchy is constructed. ContextLoaderListene ...
本文的思想来源于: Jeremy Manson and Brian Goetz, 《JSR 133 (Java Memory Model) FAQ》, February 2004, http://www.cs.umd.edu/~pugh/java/memoryModel/jsr-133-faq.html#synchronization (1) 在一些情况下,对程序变量(对象实例变量、静态变量、数组元素)进行acces ...
本文的思想来源于: Jeremy Manson and Brian Goetz, 《JSR 133 (Java Memory Model) FAQ》, February 2004, http://www.cs.umd.edu/~pugh/java/memoryModel/jsr-133-faq.html#synchronization volatile字段被用来在线程之间communicate state。任意线程所read的volatile字段的值都是最新的。 原因有四: (1) 编译器和JVM会阻止将volatile字段的值放入处理器寄存器(register); ...
本文的思想来源于: Jeremy Manson and Brian Goetz, 《JSR 133 (Java Memory Model) FAQ》, February 2004, http://www.cs.umd.edu/~pugh/java/memoryModel/jsr-133-faq.html#synchronization "double-checked locking"经常被用于Singleton模型中实现lazy load,典型的"double-checked locking"代码如下所示: // double-checke ...
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