diff options
author | antelder <antelder@13f79535-47bb-0310-9956-ffa450edef68> | 2009-10-30 12:18:56 +0000 |
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committer | antelder <antelder@13f79535-47bb-0310-9956-ffa450edef68> | 2009-10-30 12:18:56 +0000 |
commit | 7abf5a347d0f5dc9a54cd6c443daafae9f4976fc (patch) | |
tree | 99776d825d680d1f9ee4403336018ce9740b8be2 /tags/java/sca/2.0-M4-RC1/distribution/tomcat/tomcat-hook/src/main/java/org/apache/tuscany/sca/tomcat/TuscanyStandardContext.java | |
parent | b003942c4e5046a2a480d1db7d49f1936c4e0f6c (diff) |
Re-tag 2.0-M4 RC1 release
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@831279 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'tags/java/sca/2.0-M4-RC1/distribution/tomcat/tomcat-hook/src/main/java/org/apache/tuscany/sca/tomcat/TuscanyStandardContext.java')
-rw-r--r-- | tags/java/sca/2.0-M4-RC1/distribution/tomcat/tomcat-hook/src/main/java/org/apache/tuscany/sca/tomcat/TuscanyStandardContext.java | 185 |
1 files changed, 185 insertions, 0 deletions
diff --git a/tags/java/sca/2.0-M4-RC1/distribution/tomcat/tomcat-hook/src/main/java/org/apache/tuscany/sca/tomcat/TuscanyStandardContext.java b/tags/java/sca/2.0-M4-RC1/distribution/tomcat/tomcat-hook/src/main/java/org/apache/tuscany/sca/tomcat/TuscanyStandardContext.java new file mode 100644 index 0000000000..5e9b5d90e5 --- /dev/null +++ b/tags/java/sca/2.0-M4-RC1/distribution/tomcat/tomcat-hook/src/main/java/org/apache/tuscany/sca/tomcat/TuscanyStandardContext.java @@ -0,0 +1,185 @@ +/* + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you under the Apache License, Version 2.0 (the + * "License"); you may not use this file except in compliance + * with the License. You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, + * software distributed under the License is distributed on an + * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY + * KIND, either express or implied. See the License for the + * specific language governing permissions and limitations + * under the License. + */ + +package org.apache.tuscany.sca.tomcat; + +import java.io.File; +import java.net.URL; +import java.net.URLClassLoader; +import java.util.logging.Logger; + +import javax.naming.NameClassPair; +import javax.naming.NamingEnumeration; +import javax.naming.NamingException; + +import org.apache.catalina.Loader; +import org.apache.catalina.core.StandardContext; +import org.apache.catalina.deploy.FilterDef; + +/** + * A Tuscany StandardContext to initilize SCA applications. + * There is a StandardContext instance for each webapp and its + * called to handle all start/stop/etc requests. This intercepts + * the start and inserts any required Tuscany configuration. + */ +public class TuscanyStandardContext extends StandardContext { + private static final long serialVersionUID = 1L; + private static final Logger log = Logger.getLogger(TuscanyStandardContext.class.getName()); + + protected static final String TUSCANY_FILTER_NAME = "TuscanyFilter"; + protected static final String TUSCANY_SERVLET_FILTER = "org.apache.tuscany.sca.host.webapp.TuscanyServletFilter"; + protected static final String TUSCANY_CONTEXT_LISTENER = "org.apache.tuscany.sca.host.webapp.TuscanyContextListener"; + protected static final String TUSCANY_MANAGER_LISTENER = "org.apache.tuscany.sca.tomcat.foo.TuscanyTomcatNode"; + + private boolean isSCAApp; + + // TODO: this gives an instance per webapp, work out how to have only one per server + private static URLClassLoader tuscanyClassLoader; + + /** + * Overrides the getLoader method in the Tomcat StandardContext as its a convenient + * point to insert the Tuscany initilization. This gets called the first time during + * StandardContext.start after the webapp resources have been created so this can + * use getResources() to look for the SCA web.composite or sca-contribution.xml files, + * but its still early enough in start to insert the required Tuscany config. + */ + @Override + public Loader getLoader() { + if (loader != null) { + return loader; + } + + ClassLoader parent = getParentClassLoader(); + if (isSCAApp = isSCAApplication() || isTuscanyManager()) { + String sharedProp = System.getProperty(TuscanyLifecycleListener.TUSCANY_SHARED_PROP, "false"); + boolean shared = "true".equalsIgnoreCase(sharedProp); + if (!shared) { + setParentClassLoader(copy(getTuscanyClassloader(parent))); + } else { + // The default parent classloader is the one for the webapp + setParentClassLoader(getTuscanyClassloader(parent)); + } + } + + return super.getLoader(); + } + + @Override + public boolean listenerStart() { + if (isTuscanyManager()) { + // this isn't great having the manager app config scattered about different modules + // but is temp until this is all tidied up in a refactor after the basics are working + addApplicationListener(TUSCANY_MANAGER_LISTENER); + } else if (isSCAApp) { + enableTuscany(); + } + return super.listenerStart(); + } + + private void enableTuscany() { + + for (String listener : findApplicationListeners()) { + if (TUSCANY_CONTEXT_LISTENER.equals(listener)) { + // The web application already has the context listener configured + return; + } + } + + for (FilterDef filterDef : findFilterDefs()) { + if (TUSCANY_SERVLET_FILTER.equals(filterDef.getFilterClass())) { + // The web application already has the filter configured + return; + } + } + + addApplicationListener(TUSCANY_CONTEXT_LISTENER); + + FilterDef filterDef = new FilterDef(); + filterDef.setFilterName(TUSCANY_FILTER_NAME); + filterDef.setFilterClass(TUSCANY_SERVLET_FILTER); + addFilterDef(filterDef); + + if (isUseNaming() && getNamingContextListener() != null) { + setAnnotationProcessor(new TuscanyAnnotationsProcessor(this, getNamingContextListener().getEnvContext())); + } else { + setAnnotationProcessor(new TuscanyAnnotationsProcessor(this, null)); + } + + log.info("Tuscany SCA is enabled for: " + this.getName()); + } + + private boolean isSCAApplication() { + Object o = null; + try { + o = getResources().lookup("WEB-INF/web.composite"); + } catch (NamingException e) { + } + if (o == null) { + try { + o = getResources().lookup("META-INF/sca-contribution.xml"); + } catch (NamingException e) { + } + } + if (o == null) { + return false; + } + + // Try to see if the Tuscany jars are packaged in the webapp + NamingEnumeration<NameClassPair> enumeration; + try { + enumeration = getResources().list("WEB-INF/lib"); + while (enumeration.hasMoreElements()) { + String jar = enumeration.nextElement().getName(); + if (jar.startsWith("tuscany-")) { + // Do not alter is + log.info("Tuscany SCA ignoring webapp with embedded Tuscany runtime: " + this.getName()); + return false; + } + } + } catch (NamingException e) { + } + return true; + } + + private boolean isTuscanyManager() { + return "/tuscany".equals(getName()); + } + + private static URLClassLoader copy(URLClassLoader classLoader) { + return new URLClassLoader(classLoader.getURLs(), classLoader.getParent()); + } + + private synchronized URLClassLoader getTuscanyClassloader(ClassLoader parent) { + if (tuscanyClassLoader == null) { + File tuscanyWar = new File(System.getProperty(TuscanyLifecycleListener.TUSCANY_WAR_PROP)); + File[] runtimeJars = new File(tuscanyWar, "tuscany-lib").listFiles(); + try { + URL[] jarURLs = new URL[runtimeJars.length]; + for (int i = 0; i < jarURLs.length; i++) { + jarURLs[i] = runtimeJars[i].toURI().toURL(); + } + tuscanyClassLoader = new URLClassLoader(jarURLs, parent); + return tuscanyClassLoader; + } catch (Exception e) { + throw new RuntimeException(e); + } + } + return tuscanyClassLoader; + } +} |