📄 soa-overview.xtp
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<document> <header> <product>resin</product> <resin-2.0>$resin/ref/jndi.xtp</resin-2.0> <title>Resource Configuration</title> </header> <body> <localtoc/><s1 title="web-apps and JNDI Contexts"><p>Resin organizes its resources into a tree, rooted in thesystem classloader. Each Resin context is associated with a classloader,a JNDI context, and a set of resources (databases, JMS, EJB beans, etc.)</p><p>Child contexts inherit classes and resources fromthe parent contexts. For example, a database with a JNDI name"java:comp/env/jdbc/foo" belonging to the foo.com virtual host would beshared for all web-applications in that host.</p><p>When Resin detects class or configuration changes in a context, itwill reload that context and all child contexts. This is how Resinreloads an application when a servlet changes.</p><figure src="jndi_tree.gif"/><p>Each web-app gets its own JNDI copy. So a web-app named /quercusand a web-app named /cmp could each use java:comp/env/jdbc/test for adatabase pool, but would use unique pools (probably usingdifferent databases.)</p><p>This separation keeps web-apps from stepping on each other's toesand also lets each virtual host use different databases.</p><p>The web-apps can share JNDI configuration from its host, and thehosts can share JNDI configuration from the global server. Eachweb-app copies the host JNDI tree, and each host copies the serverJNDI tree. So the web-app can't affect the host's JNDI, but it canshare the host's pools.</p><p>In Resin's configuration, the context determines where the JNDIwill be shared. If the JNDI configuration is in the <host>, it willbe shared across the entire host. If it's in the <web-app>, itwill only be used in the web-app.</p><deftable><tr><th>context</th><th>scope</th></tr><tr><td>http-server</td><td>shared across all applications</td></tr><tr><td>host</td><td>shared across the virtual host</td></tr><tr><td>web-app</td><td>specific to the servlet application (.war)</td></tr></deftable><example title="host and web-app specific configuration">...<host id='foo.com'> <database name='jdbc/foo'> <driver-class id="org.gjt.mm.mysql.Driver"/> <driver-url id="jdbc:mysql://localhost:3306/foo"/> </database> <web-app id='/quercus'> <database name='jdbc/quercus'. <driver-class id="org.gjt.mm.mysql.Driver"/> <driver-url id="jdbc:mysql://localhost:3306/quercus"/> </database> </web-app></host>...</example><p>In the previous example, the java:comp/env/jdbc/foo pool is sharedacross all web-apps in foo.com, but the java:comp/env/jdbc/quercuspool is only available in the /quercus web-app.</p></s1> </body></document>⌨️ 快捷键说明
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