diff options
Diffstat (limited to 'common/openecomp-logging-lib/openecomp-logging-core/src/main/java/org/openecomp/core/logging/context')
-rw-r--r-- | common/openecomp-logging-lib/openecomp-logging-core/src/main/java/org/openecomp/core/logging/context/MdcPropagationService.java | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/common/openecomp-logging-lib/openecomp-logging-core/src/main/java/org/openecomp/core/logging/context/MdcPropagationService.java b/common/openecomp-logging-lib/openecomp-logging-core/src/main/java/org/openecomp/core/logging/context/MdcPropagationService.java new file mode 100644 index 0000000000..94ad1b9717 --- /dev/null +++ b/common/openecomp-logging-lib/openecomp-logging-core/src/main/java/org/openecomp/core/logging/context/MdcPropagationService.java @@ -0,0 +1,71 @@ +/*- + * ============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.context; + +import org.openecomp.core.logging.api.context.ContextPropagationService; +import org.slf4j.MDC; + +import java.util.Map; + +/** + * Propagates the <a href="http://www.slf4j.org/manual.html#mdc">SLF4J Mapped Diagnostic Context + * (MDC)</a> of a thread onto a runnable created by that thread, so that the context is available + * when the runnable is executed in a new thread. + */ +public class MdcPropagationService implements ContextPropagationService { + + public Runnable create(Runnable task) { + return new MdcCopyingWrapper(task); + } + + private static class MdcCopyingWrapper implements Runnable { + + private final Runnable task; + private final Map<String, String> context; + + private MdcCopyingWrapper(Runnable task) { + this.task = task; + this.context = MDC.getCopyOfContextMap(); + } + + private static void replaceMdc(Map<String, String> context) { + + if (context == null) { + MDC.clear(); + } else { + MDC.setContextMap(context); + } + } + + @Override + public void run() { + + Map<String, String> oldContext = MDC.getCopyOfContextMap(); + replaceMdc(this.context); + + try { + task.run(); + } finally { + replaceMdc(oldContext); + } + } + } +} |