1 files changed, 79 insertions, 0 deletions
diff --git a/openecomp-be/lib/openecomp-logging-lib/openecomp-sdc-logging-api/src/main/java/org/openecomp/sdc/logging/api/context/TaskFactory.java b/openecomp-be/lib/openecomp-logging-lib/openecomp-sdc-logging-api/src/main/java/org/openecomp/sdc/logging/api/context/TaskFactory.java
new file mode 100644
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--- /dev/null
+++ b/openecomp-be/lib/openecomp-logging-lib/openecomp-sdc-logging-api/src/main/java/org/openecomp/sdc/logging/api/context/TaskFactory.java
@@ -0,0 +1,79 @@
+/*-
+ * ============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.context;
+
+import org.openecomp.sdc.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>
+ *
+ * @author evitaliy
+ * @since 12/09/2016.
+ *
+ * @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 e) {
+            error = new RuntimeException("Failed to instantiate task factory", e);
+        }
+
+        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);
+    }
+}