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Diffstat (limited to 'common/openecomp-logging-lib/openecomp-logging-api/src/main/java/org/openecomp/core/logging/api/context/TaskFactory.java')
-rw-r--r-- | common/openecomp-logging-lib/openecomp-logging-api/src/main/java/org/openecomp/core/logging/api/context/TaskFactory.java | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/common/openecomp-logging-lib/openecomp-logging-api/src/main/java/org/openecomp/core/logging/api/context/TaskFactory.java b/common/openecomp-logging-lib/openecomp-logging-api/src/main/java/org/openecomp/core/logging/api/context/TaskFactory.java new file mode 100644 index 0000000000..b358a77573 --- /dev/null +++ b/common/openecomp-logging-lib/openecomp-logging-api/src/main/java/org/openecomp/core/logging/api/context/TaskFactory.java @@ -0,0 +1,73 @@ +/*- + * ============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.core.logging.api.context; + +import org.openecomp.core.logging.api.BaseFactory; + +/** + * <p>Should be used to propagate a diagnostic context (for instance <a + * href="http://www.slf4j.org/manual.html#mdc">MDC</a>) to other threads.</p> <p>Applicable when + * creating a child thread directly, or submitting tasks for potentially postponed execution via an + * <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/Executor.html">Executor</a> + * (including any of the <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ExecutorService.html">executor + * services</a> and <a href="http://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ForkJoinPool.html">ForkJoinPool</a>).</p> + * <p>The service used by this factory must implement {@link ContextPropagationService}.</p> + * + * @see ContextPropagationService + */ +@SuppressWarnings("ThrowableInstanceNeverThrown") +public class TaskFactory extends BaseFactory { + + private static final ContextPropagationService SERVICE; + private static final RuntimeException ERROR; + + static { + + ContextPropagationService service = null; + RuntimeException error = null; + + try { + service = locateService(ContextPropagationService.class); + } catch (Throwable throwable) { + error = new RuntimeException("Failed to instantiate task factory", throwable); + } + + SERVICE = service; + ERROR = error; + } + + /** + * Modify a task so that a diagnostic context is propagated to the thread when the task runs. Done + * in a logging-framework specific way. + * + * @param task any Runnable that will run in a thread + * @return modified (wrapped) original task that runs the same business logic, but also takes care + of copying the diagnostic context for logging. + */ + public static Runnable create(Runnable task) { + + if (SERVICE == null) { + throw ERROR; + } + + return SERVICE.create(task); + } +} |