diff options
Diffstat (limited to 'eelf-logger/eelf-logger-api/src/main/java/org/onap/dcae/utils/eelf/logger/api/log/EELFLogFactory.java')
-rw-r--r-- | eelf-logger/eelf-logger-api/src/main/java/org/onap/dcae/utils/eelf/logger/api/log/EELFLogFactory.java | 85 |
1 files changed, 85 insertions, 0 deletions
diff --git a/eelf-logger/eelf-logger-api/src/main/java/org/onap/dcae/utils/eelf/logger/api/log/EELFLogFactory.java b/eelf-logger/eelf-logger-api/src/main/java/org/onap/dcae/utils/eelf/logger/api/log/EELFLogFactory.java new file mode 100644 index 0000000..2cfb2ec --- /dev/null +++ b/eelf-logger/eelf-logger-api/src/main/java/org/onap/dcae/utils/eelf/logger/api/log/EELFLogFactory.java @@ -0,0 +1,85 @@ +/* + * ================================================================================ + * Copyright (c) 2018 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.onap.dcae.utils.eelf.logger.api.log; + + +import org.onap.dcae.utils.eelf.logger.api.noop.NoOpEELFLogger; + +import java.lang.reflect.InvocationTargetException; +import java.util.LinkedList; +import java.util.List; +import java.util.Map; +import java.util.ServiceLoader; +import java.util.WeakHashMap; + +/** + * EELF Log Factory uses {@link ServiceLoader} to load implementations of {@link EELFLogger} in application + * classpath. If no EELF Logging implementations are found - eelf logging is disabled and {@link NoOpEELFLogger} + * is used. + * + * @author Rajiv Singla + */ +public class EELFLogFactory { + + private static final ServiceLoader<EELFLogger> SERVICE_LOADER = ServiceLoader.load(EELFLogger.class); + private static final Map<Class<?>, EELFLogger> LOGGER_CACHE = new WeakHashMap<>(64); + + private static List<EELFLogger> loggerImplementations = new LinkedList<>(); + + static { + + for (EELFLogger loggerImplementation : SERVICE_LOADER) { + loggerImplementations.add(loggerImplementation); + } + + if (loggerImplementations.isEmpty()) { + System.err.println( + "EELF LOGGING ERROR: Unable to find any EELF Logger Implementations in the classpath."); + System.err.println("=============EELF LOGGING IS DISABLED================"); + loggerImplementations.add(NoOpEELFLogger.getInstance()); + } + + } + + private EELFLogFactory() { + // private constructor + } + + public static <T> EELFLogger getLogger(Class<T> clazz) { + + if (LOGGER_CACHE.get(clazz) != null) { + return LOGGER_CACHE.get(clazz); + } + + EELFLogger EELFLogger = null; + try { + EELFLogger = loggerImplementations.get(0).getClass().getConstructor(Class.class) + .newInstance(clazz); + return EELFLogger; + + } catch ( + InstantiationException | IllegalAccessException | InvocationTargetException | NoSuchMethodException e) { + throw new IllegalStateException("Error while Creating EELF Logger", e); + } + + } + + +} |