ServiceLoaderCache.java
/**
* Copyright (c) 2016, All partners of the iTesla project (http://www.itesla-project.eu/consortium)
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
* SPDX-License-Identifier: MPL-2.0
*/
package com.powsybl.commons.util;
import com.google.common.collect.Lists;
import java.util.List;
import java.util.Objects;
import java.util.ServiceLoader;
/**
* A thread safe service loader.
*
* @author Geoffroy Jamgotchian {@literal <geoffroy.jamgotchian at rte-france.com>}
*/
public class ServiceLoaderCache<S> {
private final Class<S> serviceClass;
private List<S> services;
public ServiceLoaderCache(Class<S> serviceClass) {
this.serviceClass = Objects.requireNonNull(serviceClass);
}
public synchronized List<S> getServices() {
if (services == null) {
services = Lists.newArrayList(ServiceLoader.load(serviceClass, ServiceLoaderCache.class.getClassLoader()));
}
return services;
}
}