Introduce new dmaapClient for use with ccsdk

[ccsdk/sli/northbound.git] / dmaap-listener / src / main / java / org / onap / ccsdk / sli / northbound / dmaapclient / SdncDmaapConsumerImpl.java

diff --git a/dmaap-listener/src/main/java/org/onap/ccsdk/sli/northbound/dmaapclient/SdncDmaapConsumerImpl.java b/dmaap-listener/src/main/java/org/onap/ccsdk/sli/northbound/dmaapclient/SdncDmaapConsumerImpl.java
new file mode 100644 (file)
index 0000000..ddd8713
--- /dev/null
+++ b/dmaap-listener/src/main/java/org/onap/ccsdk/sli/northbound/dmaapclient/SdncDmaapConsumerImpl.java
@@ -0,0 +1,159 @@
+/*-
+ * ============LICENSE_START=======================================================
+ * openECOMP : SDN-C
+ * ================================================================================
+ * 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.onap.ccsdk.sli.northbound.dmaapclient;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.util.Properties;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import com.att.nsa.mr.client.MRClientFactory;
+import com.att.nsa.mr.client.MRConsumer;
+import com.att.nsa.mr.client.response.MRConsumerResponse;
+
+public abstract class SdncDmaapConsumerImpl implements SdncDmaapConsumer {
+
+       private static final Logger LOG = LoggerFactory
+                       .getLogger(SdncDmaapConsumer.class);
+
+    private final String name = this.getClass().getSimpleName();
+       private Properties properties = null;
+    private MRConsumer consumer = null;
+    private MRConsumerResponse consumerResponse = null;
+    private boolean running = false;
+    private boolean ready = false;
+    private int fetchPause = 5000; // Default pause between fetch - 5 seconds
+    private int timeout = 15000; // Default timeout - 15 seconds
+
+       public SdncDmaapConsumerImpl() {
+
+       }
+
+       public SdncDmaapConsumerImpl(Properties properties, String propertiesPath) {
+               init(properties, propertiesPath);
+       }
+
+    public boolean isReady() {
+        return ready;
+    }
+
+    public boolean isRunning() {
+        return running;
+    }
+
+       public String getProperty(String name) {
+        return properties.getProperty(name, "");
+       }
+
+    public void init(Properties properties, String propertiesPath) {
+
+        try (FileInputStream in = new FileInputStream(new File(propertiesPath))) {
+
+           LOG.debug("propertiesPath: " + propertiesPath);
+            this.properties = (Properties) properties.clone();
+            this.properties.load(in);
+
+
+                       String timeoutStr = this.properties.getProperty("timeout");
+           LOG.debug("timeoutStr: " + timeoutStr);
+
+                       if ((timeoutStr != null) && (timeoutStr.length() > 0)) {
+                timeout = parseTimeOutValue(timeoutStr);
+                       }
+
+                       String fetchPauseStr = this.properties.getProperty("fetchPause");
+           LOG.debug("fetchPause(Str): " + fetchPauseStr);
+                       if ((fetchPauseStr != null) && (fetchPauseStr.length() > 0)) {
+                fetchPause = parseFetchPause(fetchPauseStr);
+            }
+           LOG.debug("fetchPause: " + fetchPause);
+
+
+            this.consumer = MRClientFactory.createConsumer(propertiesPath);
+            ready = true;
+        } catch (Exception e) {
+            LOG.error("Error initializing DMaaP consumer from file " + propertiesPath, e);
+        }
+    }
+
+    private int parseTimeOutValue(String timeoutStr) {
+                               try {
+            return Integer.parseInt(timeoutStr);
+                               } catch (NumberFormatException e) {
+            LOG.error("Non-numeric value specified for timeout (" + timeoutStr + ")");
+                               }
+        return timeout;
+                       }
+
+    private int parseFetchPause(String fetchPauseStr) {
+        try {
+            return Integer.parseInt(fetchPauseStr);
+        } catch (NumberFormatException e) {
+            LOG.error("Non-numeric value specified for fetchPause (" + fetchPauseStr + ")");
+               }
+        return fetchPause;
+       }
+
+
+       @Override
+       public void run() {
+               if (ready) {
+
+                       running = true;
+
+                       while (running) {
+
+                               try {
+                                       boolean noData = true;
+                                       consumerResponse = consumer.fetchWithReturnConsumerResponse(timeout, -1);
+                                       for (String msg : consumerResponse.getActualMessages()) {
+                                               noData = false;
+                                               LOG.info(name + " received ActualMessage from DMaaP:\n"+msg);
+                                               processMsg(msg);
+                                       }
+
+                                       if (noData) {
+                        LOG.info(name + " received ResponseCode: " + consumerResponse.getResponseCode());
+                                           LOG.info(name + " received ResponseMessage: " + consumerResponse.getResponseMessage());
+                        pauseThread();
+                                       }
+                               } catch (Exception e) {
+                                       LOG.error("Caught exception reading from DMaaP", e);
+                                       running = false;
+                               }
+
+
+                       }
+               }
+    }
+
+    private void pauseThread() throws InterruptedException {
+        if (fetchPause > 0) {
+            LOG.info(String.format("No data received from fetch.  Pausing %d ms before retry", fetchPause));
+            Thread.sleep(fetchPause);
+        } else {
+            LOG.info("No data received from fetch.  No fetch pause specified - retrying immediately");
+        }
+       }
+
+       abstract public void processMsg(String msg) throws InvalidMessageException;
+}