1 files changed, 116 insertions, 0 deletions
diff --git a/engine-d/src/main/java/org/onap/holmes/dsa/dmaappolling/Subscriber.java b/engine-d/src/main/java/org/onap/holmes/dsa/dmaappolling/Subscriber.java
new file mode 100644
index 0000000..160fc38
--- /dev/null
+++ b/engine-d/src/main/java/org/onap/holmes/dsa/dmaappolling/Subscriber.java
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2017 ZTE Corporation.
+ *
+ * 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.
+ */
+
+package org.onap.holmes.dsa.dmaappolling;
+
+import lombok.Getter;
+import lombok.Setter;
+import lombok.extern.slf4j.Slf4j;
+import org.apache.http.HttpResponse;
+import org.apache.http.client.methods.HttpGet;
+import org.apache.http.impl.client.CloseableHttpClient;
+import org.onap.holmes.common.api.stat.VesAlarm;
+import org.onap.holmes.common.dropwizard.ioc.utils.ServiceLocatorHolder;
+import org.onap.holmes.common.exception.CorrelationException;
+import org.onap.holmes.common.utils.GsonUtil;
+import org.onap.holmes.common.utils.HttpsUtils;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.UUID;
+
+@Getter
+@Setter
+@Slf4j
+public class Subscriber {
+
+    private DMaaPResponseUtil dMaaPResponseUtil = ServiceLocatorHolder.getLocator()
+            .getService(DMaaPResponseUtil.class);
+
+    /**
+     * The number of milliseconds to wait for messages if none are immediately available. This
+     * should normally be used, and set at 15000 or higher.
+     */
+    private int timeout = 15000;
+
+    /**
+     * The maximum number of messages to return
+     */
+    private int limit = 100;
+
+    /**
+     * The number of milliseconds to poll interval time. This should normally be used, and set at
+     * 15000 or higher.
+     */
+    private int period = timeout;
+
+    private boolean secure;
+    private String topic;
+    private String url;
+    private String uuid = UUID.randomUUID() + "";
+    private String consumerGroup = "homlesGroup" + uuid;
+    private String consumer = "homles" + uuid;
+    private String authInfo;
+    private String authExpDate;
+
+    public List<VesAlarm> subscribe() throws CorrelationException {
+        List<String> response;
+        try {
+            response = getDMaaPData();
+        } catch (Exception e) {
+            throw new CorrelationException("Failed to get data from DMaaP.", e);
+        }
+        try {
+            return extractVesAlarm(response);
+        } catch (Exception e) {
+            throw new CorrelationException("Failed to convert the response data to VES alarms.", e);
+        }
+    }
+
+    private List<String> getDMaaPData() throws Exception {
+        String response;
+        CloseableHttpClient closeableHttpClient = null;
+        HttpGet httpGet = new HttpGet(url + "/" + consumerGroup + "/" + consumer + "?timeout=" + period);
+        try {
+            closeableHttpClient = HttpsUtils.getHttpClient(timeout);
+            HttpResponse httpResponse = HttpsUtils
+                    .get(httpGet, new HashMap<>(), closeableHttpClient);
+            response = HttpsUtils.extractResponseEntity(httpResponse);
+        } catch (Exception e) {
+            throw e;
+        } finally {
+            httpGet.releaseConnection();
+            if (closeableHttpClient != null) {
+                try {
+                    closeableHttpClient.close();
+                } catch (IOException e) {
+                    log.warn("Failed to close http client!");
+                }
+            }
+        }
+        return GsonUtil.jsonToBean(response, List.class);
+    }
+
+    private List<VesAlarm> extractVesAlarm(List<String> responseEntity) throws IOException {
+        List<VesAlarm> vesAlarmList = new ArrayList<>();
+        for (String entity : responseEntity) {
+            vesAlarmList.add(dMaaPResponseUtil.convertJsonToVesAlarm(entity));
+        }
+        return vesAlarmList;
+    }
+}