/*
* Copyright 2016 the original author or authors.
*
* Licensed 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.gradle.internal.service;
import org.gradle.internal.Cast;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class CachingServiceLocator implements ServiceLocator {
private final ServiceLocator delegate;
private final Map<Class<?>, DefaultServiceLocator.ServiceFactory<?>> serviceFactories = new HashMap<Class<?>, DefaultServiceLocator.ServiceFactory<?>>();
private final Map<Class<?>, Object> services = new HashMap<Class<?>, Object>();
private final Map<Class<?>, List<?>> allServices = new HashMap<Class<?>, List<?>>();
public static CachingServiceLocator of(ServiceLocator other) {
return new CachingServiceLocator(other);
}
private CachingServiceLocator(ServiceLocator delegate) {
this.delegate = delegate;
}
@Override
public synchronized <T> DefaultServiceLocator.ServiceFactory<T> findFactory(Class<T> serviceType) {
if (serviceFactories.containsKey(serviceType)) {
return Cast.uncheckedCast(serviceFactories.get(serviceType));
}
DefaultServiceLocator.ServiceFactory<T> factory = delegate.findFactory(serviceType);
serviceFactories.put(serviceType, factory);
return factory;
}
@Override
public synchronized <T> T get(Class<T> serviceType) throws UnknownServiceException {
if (services.containsKey(serviceType)) {
return Cast.uncheckedCast(services.get(serviceType));
}
T t = delegate.get(serviceType);
services.put(serviceType, t);
return t;
}
@Override
public synchronized <T> List<T> getAll(Class<T> serviceType) throws UnknownServiceException {
if (allServices.containsKey(serviceType)) {
return Cast.uncheckedCast(allServices.get(serviceType));
}
List<T> all = delegate.getAll(serviceType);
allServices.put(serviceType, all);
return all;
}
@Override
public synchronized <T> DefaultServiceLocator.ServiceFactory<T> getFactory(Class<T> serviceType) throws UnknownServiceException {
DefaultServiceLocator.ServiceFactory<T> factory = findFactory(serviceType);
if (factory == null) {
throw new UnknownServiceException(serviceType, String.format("Could not find meta-data resource 'META-INF/services/%s' for service '%s'.", serviceType.getName(), serviceType.getName()));
}
return factory;
}
}