diff options
Diffstat (limited to 'openecomp-be/lib/openecomp-logging-lib/openecomp-sdc-logging-api/src/main/java/org/openecomp/sdc/logging/api/BaseFactory.java')
-rw-r--r-- | openecomp-be/lib/openecomp-logging-lib/openecomp-sdc-logging-api/src/main/java/org/openecomp/sdc/logging/api/BaseFactory.java | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/openecomp-be/lib/openecomp-logging-lib/openecomp-sdc-logging-api/src/main/java/org/openecomp/sdc/logging/api/BaseFactory.java b/openecomp-be/lib/openecomp-logging-lib/openecomp-sdc-logging-api/src/main/java/org/openecomp/sdc/logging/api/BaseFactory.java new file mode 100644 index 0000000000..3be67dfde2 --- /dev/null +++ b/openecomp-be/lib/openecomp-logging-lib/openecomp-sdc-logging-api/src/main/java/org/openecomp/sdc/logging/api/BaseFactory.java @@ -0,0 +1,58 @@ +/*- + * ============LICENSE_START======================================================= + * SDC + * ================================================================================ + * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved. + * ================================================================================ + * 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. + * ============LICENSE_END========================================================= + */ + +package org.openecomp.sdc.logging.api; + +import java.util.Iterator; +import java.util.ServiceLoader; + +/** + * Contains common functionality for factories used in the logging framework. + * + * <p>In order to use the factory, a particular (e.g. framework-specific) implementation of a service must be + * configured as described in + * <a href="http://docs.oracle.com/javase/8/docs/api/java/util/ServiceLoader.html">java.util.ServiceLoader</a>).</p> + * + * @author evitaliy + * @since 13/09/2016. + * + * @see ServiceLoader + */ +public class BaseFactory { + + protected static <T> T locateService(Class<T> clazz) throws Exception { + + T service; + ServiceLoader<T> loader = ServiceLoader.load(clazz); + Iterator<T> iterator = loader.iterator(); + if (iterator.hasNext()) { + + service = iterator.next(); + if (iterator.hasNext()) { + System.err.println(String.format("Warning! Configured more than one implementation of %s", + clazz.getName())); + } + + return service; + } + + throw new IllegalArgumentException((String.format("No implementations configured for %s", clazz.getName()))); + } +} |