| /* |
| * Copyright 2016 Open Networking Laboratory |
| * |
| * 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.onosproject.cpman.impl; |
| |
| import org.onosproject.cpman.SystemInfo; |
| import org.slf4j.Logger; |
| |
| import static org.slf4j.LoggerFactory.getLogger; |
| |
| /** |
| * A factory class which instantiates a system info object. |
| */ |
| public final class SystemInfoFactory { |
| |
| private final Logger log = getLogger(getClass()); |
| |
| private SystemInfo systemInfo; |
| |
| // non-instantiable (except for our Singleton) |
| private SystemInfoFactory() { |
| } |
| |
| /** |
| * Returns system information. |
| * |
| * @return reference object of system info |
| */ |
| public SystemInfo getSystemInfo() { |
| synchronized (systemInfo) { |
| return this.systemInfo; |
| } |
| } |
| |
| /** |
| * Set system information only if it is empty. |
| * |
| * @param systemInfo reference object of system info |
| */ |
| public void setSystemInfo(SystemInfo systemInfo) { |
| synchronized (systemInfo) { |
| if (this.systemInfo == null) { |
| this.systemInfo = systemInfo; |
| } else { |
| log.warn("System information has already been set"); |
| } |
| } |
| } |
| |
| /** |
| * Returns an instance of system info factory. |
| * |
| * @return instance of system info factory |
| */ |
| public static SystemInfoFactory getInstance() { |
| return SingletonHelper.INSTANCE; |
| } |
| |
| private static class SingletonHelper { |
| private static final SystemInfoFactory INSTANCE = new SystemInfoFactory(); |
| } |
| } |