1 files changed, 87 insertions, 0 deletions
diff --git a/datafile-app-server/src/main/java/org/onap/dcaegen2/collectors/datafile/model/logging/MappedDiagnosticContext.java b/datafile-app-server/src/main/java/org/onap/dcaegen2/collectors/datafile/model/logging/MappedDiagnosticContext.java
new file mode 100644
index 00000000..2643eea5
--- /dev/null
+++ b/datafile-app-server/src/main/java/org/onap/dcaegen2/collectors/datafile/model/logging/MappedDiagnosticContext.java
@@ -0,0 +1,87 @@
+/*
+ * ============LICENSE_START======================================================================
+ * Copyright (C) 2018 NOKIA Intellectual Property, 2019 Nordix Foundation. 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.dcaegen2.collectors.datafile.model.logging;
+
+import java.util.Map;
+import java.util.UUID;
+import org.apache.commons.lang3.StringUtils;
+import org.apache.http.client.methods.HttpRequestBase;
+import org.onap.dcaegen2.services.sdk.rest.services.model.logging.MdcVariables;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.slf4j.MDC;
+import org.slf4j.Marker;
+import org.slf4j.MarkerFactory;
+import org.springframework.http.HttpHeaders;
+
+/**
+ * Support functions for MDC.
+ */
+public final class MappedDiagnosticContext {
+
+    public static final Marker ENTRY = MarkerFactory.getMarker("ENTRY");
+    public static final Marker EXIT = MarkerFactory.getMarker("EXIT");
+    private static final Marker INVOKE = MarkerFactory.getMarker("INVOKE");
+
+    private static final Logger logger = LoggerFactory.getLogger(MappedDiagnosticContext.class);
+
+    private MappedDiagnosticContext() {}
+
+    /**
+     * Inserts the relevant trace information in the HTTP header.
+     *
+     * @param httpRequest a request
+     */
+    public static void appendTraceInfo(HttpRequestBase httpRequest) {
+        String requestId = MDC.get(MdcVariables.REQUEST_ID);
+        httpRequest.addHeader(MdcVariables.X_ONAP_REQUEST_ID, requestId);
+        httpRequest.addHeader("X-RequestID", requestId); // deprecated
+        httpRequest.addHeader("X-TransactionID", requestId); // deprecated
+
+        String invocationId = UUID.randomUUID().toString();
+        httpRequest.addHeader(MdcVariables.X_INVOCATION_ID, invocationId);
+        logger.info(INVOKE, "Invoking request with invocation ID {}", invocationId);
+    }
+
+    /**
+     * Initialize MDC from relevant information in a received HTTP header.
+     *
+     * @param headers a received HTPP header
+     */
+    public static void initializeTraceContext(HttpHeaders headers) {
+        String requestId = headers.getFirst(MdcVariables.X_ONAP_REQUEST_ID);
+        if (StringUtils.isBlank(requestId)) {
+            requestId = UUID.randomUUID().toString();
+        }
+        String invocationId = headers.getFirst(MdcVariables.X_INVOCATION_ID);
+        if (StringUtils.isBlank(invocationId)) {
+            invocationId = UUID.randomUUID().toString();
+        }
+        MDC.put(MdcVariables.REQUEST_ID, requestId);
+        MDC.put(MdcVariables.INVOCATION_ID, invocationId);
+    }
+
+    /**
+     * Initialize the MDC when a new context is started.
+     * @return a copy of the new trace context
+     */
+    public static Map<String, String> initializeTraceContext() {
+        MDC.clear();
+        MDC.put(MdcVariables.REQUEST_ID, UUID.randomUUID().toString());
+        return MDC.getCopyOfContextMap();
+    }
+}