1 files changed, 131 insertions, 0 deletions
diff --git a/common/src/main/java/org/openecomp/mso/client/dmaap/DmaapConsumer.java b/common/src/main/java/org/openecomp/mso/client/dmaap/DmaapConsumer.java
new file mode 100644
index 0000000000..033951612d
--- /dev/null
+++ b/common/src/main/java/org/openecomp/mso/client/dmaap/DmaapConsumer.java
@@ -0,0 +1,131 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * ONAP - SO
+ * ================================================================================
+ * 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.mso.client.dmaap;
+
+import java.io.FileNotFoundException;
+import java.io.IOException;
+import java.util.concurrent.TimeUnit;
+
+import org.openecomp.mso.client.dmaap.exceptions.DMaaPConsumerFailure;
+import org.openecomp.mso.client.dmaap.exceptions.ExceededMaximumPollingTime;
+import org.openecomp.mso.client.dmaap.rest.RestConsumer;
+
+import com.google.common.base.Stopwatch;
+
+public abstract class DmaapConsumer extends DmaapClient {
+
+	public DmaapConsumer() throws FileNotFoundException, IOException {
+		super("dmaap/default-consumer.properties");
+	}
+	
+	public Consumer getConsumer() throws FileNotFoundException, IOException {
+		return new RestConsumer(this.properties);
+	}
+	public boolean consume() throws Exception {
+		
+		Consumer mrConsumer = this.getConsumer();
+		int iterations = 0;
+		boolean accepted = false;
+		Stopwatch stopwatch = Stopwatch.createUnstarted();
+		try {
+			while (this.continuePolling()) {
+				if (stopwatch.elapsed(TimeUnit.MILLISECONDS) >= this.getMaximumElapsedTime()) {
+					final String message = "exceeded maximum retries on " + this.getRequestId() + " on " + this.getTopic();
+					auditLogger.error(message);
+					throw new ExceededMaximumPollingTime(message);
+				}
+				stopwatch.start();
+				Iterable<String> itr = mrConsumer.fetch();
+				stopwatch.stop();
+				for (String message : itr) {
+					if (!accepted && this.isAccepted(message)) {
+						auditLogger.info("accepted message found for " + this.getRequestId() + " on " + this.getTopic());
+						accepted = true;
+					} 
+					if (accepted) {
+						if (this.isFailure(message)) {
+							this.stopProcessingMessages();
+							auditLogger.info("received dmaap message: " + message);
+							final String errorMsg = "failure received from dmaap topic " + this.getTopic();
+							auditLogger.error(errorMsg);
+							throw new DMaaPConsumerFailure(errorMsg);
+						} else {
+							auditLogger.info("received dmaap message: " + message);
+							this.processMessage(message);
+						}
+					}
+				}
+				iterations++;
+			}
+			return true;
+		} catch (Exception e ) {
+			throw e;
+		} finally {
+			if (stopwatch.isRunning()) {
+				stopwatch.stop();
+			}
+		}
+	}
+	
+	/**
+	 * Should this consumer continue to consume messages from the topic?
+	 * @return
+	 */
+	public abstract boolean continuePolling();
+	/**
+	 * Process a message from a DMaaP topic
+	 * 
+	 * @param message
+	 * @throws Exception
+	 */
+	public abstract void processMessage(String message) throws Exception;
+	/**
+	 * Has the request been accepted by the receiving system?
+	 * Should the consumer move to processing messages?
+	 * 
+	 * @param message
+	 * @return
+	 */
+	public abstract boolean isAccepted(String message);
+	/**
+	 * has the request failed?
+	 * 
+	 * @param message
+	 * @return
+	 */
+	public abstract boolean isFailure(String message);
+	/**
+	 * The request id to filter messages on
+	 * @return
+	 */
+	public abstract String getRequestId();
+	/**
+	 * Logic that defines when the consumer should stop processing messages
+	 */
+	public abstract void stopProcessingMessages();
+	
+	/**
+	 * time in milliseconds
+	 */
+	public int getMaximumElapsedTime() {
+		return 180000;
+	}
+}