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/*
* 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;
import java.io.IOException;
import java.util.Set;
import java.util.logging.Logger;
/**
* Service discovery for Tuscany based on J2SE Jar service provider spec.
* Services are described using configuration files in META-INF/services.
* Service description specifies a class name followed by optional properties.
*
*
* @version $Rev$ $Date$
*/
public final class ServiceDiscovery implements ServiceDiscoverer {
private static final Logger logger = Logger.getLogger(ServiceDiscovery.class.getName());
private final static ServiceDiscovery INSTANCE = new ServiceDiscovery();
private ServiceDiscoverer discoverer;
private ServiceDiscovery() {
super();
}
/**
* Get an instance of Service discovery, one instance is created per
* ClassLoader that this class is loaded from
*
* @return
*/
public static ServiceDiscovery getInstance() {
return INSTANCE;
}
public ServiceDiscoverer getServiceDiscoverer() {
if (discoverer != null) {
return discoverer;
}
try {
//FIXME Remove that upside-down dependency
Class.forName("org.apache.tuscany.sca.extensibility.equinox.EquinoxServiceDiscoverer");
if (discoverer != null) {
return discoverer;
}
} catch (Throwable e) {
}
discoverer = new ContextClassLoaderServiceDiscoverer();
return discoverer;
}
public void setServiceDiscoverer(ServiceDiscoverer sd) {
if (discoverer != null) {
throw new IllegalStateException("The ServiceDiscoverer cannot be reset");
}
discoverer = sd;
}
public Set<ServiceDeclaration> getServiceDeclarations(String name) throws IOException {
Set<ServiceDeclaration> services = getServiceDiscoverer().getServiceDeclarations(name);
return services;
}
public ServiceDeclaration getFirstServiceDeclaration(final String name) throws IOException {
ServiceDeclaration service = getServiceDiscoverer().getFirstServiceDeclaration(name);
return service;
}
}
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