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author | antelder <antelder@13f79535-47bb-0310-9956-ffa450edef68> | 2009-10-28 09:54:25 +0000 |
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committer | antelder <antelder@13f79535-47bb-0310-9956-ffa450edef68> | 2009-10-28 09:54:25 +0000 |
commit | 613b275ffa5d7ae0c41b625db231c187b8a136ef (patch) | |
tree | 74f448551ee167bfb627fa51849f006e4f5ffb31 /branches/sca-java-2.0-M4/modules/extensibility-equinox/src/main/java/org/apache/tuscany/sca/extensibility/equinox/EquinoxServiceDiscoverer.java | |
parent | 17d6a0df23caf287e42c7dbf3919e49d60fdedd2 (diff) |
Create 2.0 M4 release branch
git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@830484 13f79535-47bb-0310-9956-ffa450edef68
Diffstat (limited to 'branches/sca-java-2.0-M4/modules/extensibility-equinox/src/main/java/org/apache/tuscany/sca/extensibility/equinox/EquinoxServiceDiscoverer.java')
-rw-r--r-- | branches/sca-java-2.0-M4/modules/extensibility-equinox/src/main/java/org/apache/tuscany/sca/extensibility/equinox/EquinoxServiceDiscoverer.java | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/branches/sca-java-2.0-M4/modules/extensibility-equinox/src/main/java/org/apache/tuscany/sca/extensibility/equinox/EquinoxServiceDiscoverer.java b/branches/sca-java-2.0-M4/modules/extensibility-equinox/src/main/java/org/apache/tuscany/sca/extensibility/equinox/EquinoxServiceDiscoverer.java new file mode 100644 index 0000000000..2b3e087e52 --- /dev/null +++ b/branches/sca-java-2.0-M4/modules/extensibility-equinox/src/main/java/org/apache/tuscany/sca/extensibility/equinox/EquinoxServiceDiscoverer.java @@ -0,0 +1,319 @@ +/* + * 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.extensibility.equinox; + +import static org.apache.tuscany.sca.extensibility.ServiceDeclarationParser.parseDeclaration; + +import java.io.BufferedReader; +import java.io.IOException; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.net.URL; +import java.security.AccessController; +import java.security.PrivilegedAction; +import java.security.PrivilegedActionException; +import java.security.PrivilegedExceptionAction; +import java.util.Collection; +import java.util.Enumeration; +import java.util.HashMap; +import java.util.HashSet; +import java.util.Map; +import java.util.Properties; +import java.util.Set; +import java.util.logging.Level; +import java.util.logging.Logger; + +import org.apache.tuscany.sca.extensibility.ServiceDeclaration; +import org.apache.tuscany.sca.extensibility.ServiceDiscoverer; +import org.osgi.framework.Bundle; +import org.osgi.framework.BundleContext; +import org.osgi.framework.BundleException; +import org.osgi.framework.Constants; + +/** + * A ServiceDiscoverer that find META-INF/services/... in installed bundles + * + * @version $Rev$ $Date$ + */ +public class EquinoxServiceDiscoverer implements ServiceDiscoverer { + private static final Logger logger = Logger.getLogger(EquinoxServiceDiscoverer.class.getName()); + + private BundleContext context; + + public EquinoxServiceDiscoverer(BundleContext context) { + this.context = context; + } + + public static class ServiceDeclarationImpl implements ServiceDeclaration { + private Bundle bundle; + private URL url; + private String className; + private Class<?> javaClass; + private Map<String, String> attributes; + + public ServiceDeclarationImpl(Bundle bundle, URL url, String className, Map<String, String> attributes) { + super(); + this.bundle = bundle; + this.url = url; + this.className = className; + this.attributes = attributes; + } + + public Map<String, String> getAttributes() { + return attributes; + } + + public String getClassName() { + return className; + } + + public Class<?> loadClass() throws ClassNotFoundException { + if (className == null) { + return null; + } + if (javaClass == null) { + javaClass = loadClass(className); + } + return javaClass; + } + + public Class<?> loadClass(String className) throws ClassNotFoundException { + return bundle.loadClass(className); + } + + public URL getLocation() { + return url; + } + + public URL getResource(final String name) { + return AccessController.doPrivileged(new PrivilegedAction<URL>() { + public URL run() { + return bundle.getResource(name); + } + }); + } + + @Override + public String toString() { + StringBuffer sb = new StringBuffer(); + sb.append("Bundle: ").append(EquinoxServiceDiscoverer.toString(bundle)); + sb.append(" Resource: ").append(url); + sb.append(" Attributes: ").append(attributes); + return sb.toString(); + } + + public Bundle getBundle() { + return bundle; + } + + public boolean isAssignableTo(Class<?> serviceType) { + try { + loadClass(); + } catch (ClassNotFoundException e) { + // Ignore + } + return (javaClass != null && serviceType.isAssignableFrom(javaClass)); + } + + } + + /** + * Empty static method to trigger the activation of this bundle. + */ + public static void init() { + } + + private static String toString(Bundle b) { + StringBuffer sb = new StringBuffer(); + sb.append(b.getBundleId()).append(" ").append(b.getSymbolicName()); + int s = b.getState(); + if ((s & Bundle.UNINSTALLED) != 0) { + sb.append(" UNINSTALLED"); + } + if ((s & Bundle.INSTALLED) != 0) { + sb.append(" INSTALLED"); + } + if ((s & Bundle.RESOLVED) != 0) { + sb.append(" RESOLVED"); + } + if ((s & Bundle.STARTING) != 0) { + sb.append(" STARTING"); + } + if ((s & Bundle.STOPPING) != 0) { + sb.append(" STOPPING"); + } + if ((s & Bundle.ACTIVE) != 0) { + sb.append(" ACTIVE"); + } + return sb.toString(); + + } + + + public ServiceDeclaration getServiceDeclaration(String name) throws IOException { + Collection<ServiceDeclaration> declarations = getServiceDeclarations(name); + if (declarations.isEmpty()) { + return null; + } else { + return declarations.iterator().next(); + } + } + + public Collection<ServiceDeclaration> getServiceDeclarations(String serviceName) throws IOException { + boolean debug = logger.isLoggable(Level.FINE); + Collection<ServiceDeclaration> descriptors = new HashSet<ServiceDeclaration>(); + + // http://java.sun.com/j2se/1.5.0/docs/api/javax/xml/xpath/XPathFactory.html + boolean isPropertyFile = "javax.xml.xpath.XPathFactory".equals(serviceName); + serviceName = "META-INF/services/" + serviceName; + + Set<URL> visited = new HashSet<URL>(); + for (Bundle bundle : context.getBundles()) { + if (bundle.getBundleId() == 0 || bundle.getHeaders().get(Constants.FRAGMENT_HOST) != null) { + // Skip system bundle as it has access to the application classloader + // Skip bundle fragments too + continue; + } + Enumeration<URL> urls = null; + try { + // Use getResources to find resources on the classpath of the bundle + // Please note there are cases that getResources will return null even + // the bundle containing such entries: + // 1. There is a match on Import-Package or DynamicImport-Package, and another + // bundle exports the resource package, there is a possiblity that it doesn't + // find the containing entry + // 2. The bundle cannot be resolved, then getResources will return null + urls = bundle.getResources(serviceName); + if (urls == null) { + URL entry = bundle.getEntry(serviceName); + if (entry != null) { + logger.warning("Unresolved resource " + serviceName + " found in " + toString(bundle)); + try { + bundle.start(); + } catch (BundleException e) { + logger.log(Level.SEVERE, e.getMessage(), e); + } + // urls = Collections.enumeration(Arrays.asList(entry)); + } + } + } catch (IOException e) { + logger.log(Level.SEVERE, e.getMessage(), e); + } + if (urls == null) { + continue; + } + while (urls.hasMoreElements()) { + final URL url = urls.nextElement(); + + if (!visited.add(url)) { + // The URL has already been processed + continue; + } + + if (debug) { + logger.fine("Reading service provider file: " + url.toExternalForm()); + } + try { + // Allow privileged access to open URL stream. Add FilePermission to added to security + // policy file. + InputStream is; + try { + is = AccessController.doPrivileged(new PrivilegedExceptionAction<InputStream>() { + public InputStream run() throws IOException { + return url.openStream(); + } + }); + } catch (PrivilegedActionException e) { + throw (IOException)e.getException(); + } + if (isPropertyFile) { + // Load as a property file + Properties props = new Properties(); + props.load(is); + is.close(); + for (Map.Entry<Object, Object> e : props.entrySet()) { + Map<String, String> attributes = new HashMap<String, String>(); + String key = (String)e.getKey(); + String value = (String)e.getValue(); + // Unfortunately, the xalan file only has the classname + if ("".equals(value)) { + value = key; + key = ""; + } + if (!"".equals(key)) { + attributes.put(key, value); + attributes.put("uri", key); + } + attributes.putAll(parseDeclaration(value)); + ServiceDeclarationImpl descriptor = new ServiceDeclarationImpl(bundle, url, value, attributes); + descriptors.add(descriptor); + } + continue; + } + BufferedReader reader = null; + try { + reader = new BufferedReader(new InputStreamReader(is)); + int count = 0; + while (true) { + String line = reader.readLine(); + if (line == null) + break; + line = line.trim(); + if (!line.startsWith("#") && !"".equals(line)) { + String reg = line.trim(); + if (debug) { + logger.fine("Registering service provider: " + reg); + } + + Map<String, String> attributes = parseDeclaration(reg); + String className = attributes.get("class"); + if (className == null) { + // Add a unique class name to prevent equals() from returning true + className = "_class_" + count; + count++; + } + ServiceDeclarationImpl descriptor = + new ServiceDeclarationImpl(bundle, url, className, attributes); + descriptors.add(descriptor); + } + } + } finally { + if (reader != null) { + try { + reader.close(); + } catch (IOException e) { + // Ignore + } + } + } + } catch (IOException e) { + logger.log(Level.SEVERE, e.getMessage(), e); + } + } + } + return descriptors; + } + + public ClassLoader getContextClassLoader() { + // Get the bundle classloader for the extensibility bundle that has DynamicImport-Package * + return getClass().getClassLoader(); + } + +} |