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Diffstat (limited to 'sandbox/axis2-1.4/modules/host-embedded/src/main/java/org/apache/tuscany/sca/host/embedded/SCADomain.java')
| -rw-r--r-- | sandbox/axis2-1.4/modules/host-embedded/src/main/java/org/apache/tuscany/sca/host/embedded/SCADomain.java | 284 |
1 files changed, 284 insertions, 0 deletions
diff --git a/sandbox/axis2-1.4/modules/host-embedded/src/main/java/org/apache/tuscany/sca/host/embedded/SCADomain.java b/sandbox/axis2-1.4/modules/host-embedded/src/main/java/org/apache/tuscany/sca/host/embedded/SCADomain.java new file mode 100644 index 0000000000..00e6f49f84 --- /dev/null +++ b/sandbox/axis2-1.4/modules/host-embedded/src/main/java/org/apache/tuscany/sca/host/embedded/SCADomain.java @@ -0,0 +1,284 @@ +/* + * 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.host.embedded; + +import java.io.BufferedReader; +import java.io.IOException; +import java.io.InputStream; +import java.io.InputStreamReader; +import java.lang.reflect.Constructor; +import java.security.AccessController; +import java.security.PrivilegedAction; +import java.security.PrivilegedActionException; +import java.security.PrivilegedExceptionAction; + +import org.apache.tuscany.sca.host.embedded.impl.DefaultSCADomain; +import org.apache.tuscany.sca.host.embedded.management.ComponentManager; +import org.osoa.sca.CallableReference; +import org.osoa.sca.ServiceReference; +import org.osoa.sca.ServiceRuntimeException; + +/** + * A handle to an SCA domain. + * + * @version $Rev$ $Date$ + */ +public abstract class SCADomain { + + static final String LOCAL_DOMAIN_URI = "http://localhost"; + + /** + * Static variable to hold the most recent instance of SCADomain + */ + // TODO: Temporary support for SCADomain.connect() API + protected static SCADomain theDomain; + + + /** + * Returns a new instance of a local SCA domain. + * + * @return + */ + public static SCADomain newInstance() { + return createNewInstance(LOCAL_DOMAIN_URI, null); + } + + /** + * Returns a new instance of a local SCA domain. The specified deployable + * composite will be included in the SCA domain. + * + * @param composite the deployable composite to include in the SCA domain. + * @return + */ + public static SCADomain newInstance(String composite) { + return createNewInstance(LOCAL_DOMAIN_URI, "/", composite); + } + + /** + * Returns a new instance of a local SCA domain. The specified deployable + * composites will be included in the SCA domain. + * + * @param domainURI the URI of the SCA domain + * @param contributionLocation the location of an SCA contribution + * @param composites the deployable composites to include in the SCA domain. + * @return + */ + public static SCADomain newInstance(String domainURI, String contributionLocation, String... composites) { + return createNewInstance(domainURI, contributionLocation, composites); + } + + /** + * Removes the specified local SCA Domain instance + * + * @param domainInstance the instance to be removed + */ + // FIXME: Adding this as temporary support for the "connect" API + public static void removeInstance(SCADomain domainInstance) { + theDomain = null; + } + + /** + * Returns an SCADomain representing a remote SCA domain. + * + * @param domainURI the URI of the SCA domain + * @return + */ + // FIXME : this is a temporary implementation to get the capability working + public static SCADomain connect(String domainURI) { + return theDomain; + } + + /** + * Close the SCA domain. + */ + public void close() { + // TODO: temporary to support initial SCADomain.connect capability + SCADomain.removeInstance(this); + } + + /** + * Returns the URI of the SCA Domain. + * + * @return the URI of the SCA Domain + */ + public abstract String getURI(); + + /** + * Cast a type-safe reference to a CallableReference. Converts a type-safe + * reference to an equivalent CallableReference; if the target refers to a + * service then a ServiceReference will be returned, if the target refers to + * a callback then a CallableReference will be returned. + * + * @param target a reference proxy provided by the SCA runtime + * @param <B> the Java type of the business interface for the reference + * @param <R> the type of reference to be returned + * @return a CallableReference equivalent for the proxy + * @throws IllegalArgumentException if the supplied instance is not a + * reference supplied by the SCA runtime + */ + public abstract <B, R extends CallableReference<B>> R cast(B target) throws IllegalArgumentException; + + /** + * Returns a proxy for a service provided by a component in the SCA domain. + * + * @param businessInterface the interface that will be used to invoke the + * service + * @param serviceName the name of the service + * @param <B> the Java type of the business interface for the service + * @return an object that implements the business interface + */ + public abstract <B> B getService(Class<B> businessInterface, String serviceName); + + /** + * Returns a ServiceReference for a service provided by a component in the + * SCA domain. + * + * @param businessInterface the interface that will be used to invoke the + * service + * @param serviceName the name of the service + * @param <B> the Java type of the business interface for the service + * @return a ServiceReference for the designated service + */ + public abstract <B> ServiceReference<B> getServiceReference(Class<B> businessInterface, String serviceName); + + /** + * Read the service name from a configuration file + * + * @param classLoader + * @param name The name of the service class + * @return A class name which extends/implements the service class + * @throws IOException + */ + private static String getServiceName(final ClassLoader classLoader, final String name) throws IOException { + InputStream is; + // Allow privileged access to open stream. Requires FilePermission in security policy. + try { + is = AccessController.doPrivileged(new PrivilegedExceptionAction<InputStream>() { + public InputStream run() throws IOException { + return classLoader.getResourceAsStream("META-INF/services/" + name); + } + }); + } catch (PrivilegedActionException e) { + throw (IOException)e.getException(); + } + + if (is == null) { + return null; + } + BufferedReader reader = null; + try { + reader = new BufferedReader(new InputStreamReader(is)); + while (true) { + String line = reader.readLine(); + if (line == null) { + break; + } else if (!line.startsWith("#")) { + return line.trim(); + } + } + } finally { + if (reader != null) { + reader.close(); + } + } + return null; + } + + /** + * Returns an SCADomain instance. If the system property + * "org.apache.tuscany.sca.host.embedded.SCADomain" is set, its value is used as + * the name of the implementation class. Otherwise, if the resource + * "META-INF/services/org.apache.tuscany.sca.host.embedded.SCADomain" can be + * loaded from the supplied ClassLoader. Otherwise, it will use + * "org.apache.tuscany.sca.host.embedded.impl.DefaultSCADomain" as the default. + * The named class is loaded from the supplied ClassLoader. + * + * @param classLoader + * @param domainURI + * @param contributionLocation + * @param composites + * @return + */ + static SCADomain createNewInstance(String domainURI, String contributionLocation, String... composites) { + + SCADomain domain = null; + + try { + // Determine the runtime and application ClassLoader + final ClassLoader runtimeClassLoader = SCADomain.class.getClassLoader(); + final ClassLoader applicationClassLoader = Thread.currentThread().getContextClassLoader(); + + // Discover the SCADomain implementation + final String name = SCADomain.class.getName(); + String className = AccessController.doPrivileged(new PrivilegedAction<String>() { + public String run() { + return System.getProperty(name); + } + }); + + if (className == null) { + className = getServiceName(runtimeClassLoader, name); + } + + if (className == null) { + + // Create a default SCA domain implementation + domain = + new DefaultSCADomain(runtimeClassLoader, + applicationClassLoader, + domainURI, + contributionLocation, + composites); + } else { + + // Create an instance of the discovered SCA domain implementation + Class cls = Class.forName(className, true, runtimeClassLoader); + Constructor<?> constructor = null; + try { + constructor = cls.getConstructor(ClassLoader.class, ClassLoader.class, + String.class, String.class, String[].class); + } catch (NoSuchMethodException e) {} + if (constructor != null) { + domain = (SCADomain)constructor.newInstance(runtimeClassLoader, + applicationClassLoader, + domainURI, + contributionLocation, + composites); + } else { + + constructor = cls.getConstructor(ClassLoader.class, String.class); + domain = (SCADomain)constructor.newInstance(runtimeClassLoader, domainURI); + } + } + + // FIXME: temporary support for connect() API + theDomain = domain; + + return domain; + + } catch (Exception e) { + throw new ServiceRuntimeException(e); + } + } + + public ComponentManager getComponentManager() { + return null; + } + +} |