PnfReadyEventConsumer implementation

Change-Id: I7252400a3f60ca22ddfa71edb28eaf1d16ccd9b4
Issue-ID: SO-466
Signed-off-by: Lukasz Muszkieta <lukasz.muszkieta@nokia.com>

1 files changed, 88 insertions, 11 deletions

diff --git a/bpmn/MSOInfrastructureBPMN/src/main/java/org/openecomp/mso/bpmn/infrastructure/pnf/dmaap/PnfEventReadyConsumer.java b/bpmn/MSOInfrastructureBPMN/src/main/java/org/openecomp/mso/bpmn/infrastructure/pnf/dmaap/PnfEventReadyConsumer.java
index e6019f73f0..6871665ba1 100644
--- a/bpmn/MSOInfrastructureBPMN/src/main/java/org/openecomp/mso/bpmn/infrastructure/pnf/dmaap/PnfEventReadyConsumer.java
+++ b/bpmn/MSOInfrastructureBPMN/src/main/java/org/openecomp/mso/bpmn/infrastructure/pnf/dmaap/PnfEventReadyConsumer.java
@@ -22,17 +22,28 @@ package org.openecomp.mso.bpmn.infrastructure.pnf.dmaap;
 
 import java.io.IOException;
 import java.net.URI;
+import java.util.Map;
+import java.util.Optional;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.concurrent.Executors;
+import java.util.concurrent.ScheduledExecutorService;
+import java.util.concurrent.TimeUnit;
 import javax.ws.rs.core.UriBuilder;
 import org.apache.http.HttpResponse;
 import org.apache.http.client.HttpClient;
 import org.apache.http.client.methods.HttpGet;
 import org.apache.http.impl.client.HttpClientBuilder;
+import org.apache.http.util.EntityUtils;
+import org.openecomp.mso.bpmn.infrastructure.pnf.implementation.DmaapClient;
+import org.openecomp.mso.jsonpath.JsonPathUtil;
+import org.openecomp.mso.logger.MsoLogger;
 
-public class PnfEventReadyConsumer {
+public class PnfEventReadyConsumer implements Runnable, DmaapClient {
+
+    private static final MsoLogger LOGGER = MsoLogger.getMsoLogger(MsoLogger.Catalog.RA);
 
     private static final String JSON_PATH_CORRELATION_ID = "$.pnfRegistrationFields.correlationId";
     private HttpClient httpClient;
-
     private String dmaapHost;
     private int dmaapPort;
     private String dmaapProtocol;
@@ -40,24 +51,57 @@ public class PnfEventReadyConsumer {
     private String dmaapTopicName;
     private String consumerId;
     private String consumerGroup;
+    private Map<String, Runnable> pnfCorrelationIdToThreadMap;
+    private HttpGet getRequest;
+    private ScheduledExecutorService executor;
+    private int dmaapClientInitialDelayInSeconds;
+    private int dmaapClientDelayInSeconds;
+    private boolean dmaapThreadListenerIsRunning;
 
     public PnfEventReadyConsumer() {
         httpClient = HttpClientBuilder.create().build();
+        pnfCorrelationIdToThreadMap = new ConcurrentHashMap<>();
+        executor = null;
+    }
+
+    public void init() {
+        getRequest = new HttpGet(buildURI());
+    }
+
+    @Override
+    public void run() {
+        try {
+            HttpResponse response = httpClient.execute(getRequest);
+            getCorrelationIdFromResponse(response).ifPresent(this::informAboutPnfReadyIfCorrelationIdFound);
+        } catch (IOException e) {
+            LOGGER.error("Exception caught during sending rest request to dmaap for listening event topic", e);
+        }
+    }
+
+    @Override
+    public void registerForUpdate(String correlationId, Runnable informConsumer) {
+        pnfCorrelationIdToThreadMap.put(correlationId, informConsumer);
+        if (!dmaapThreadListenerIsRunning) {
+            startDmaapThreadListener();
+        }
     }
 
-    public void notifyWhenPnfReady(String correlationId)
-            throws IOException {
-        HttpGet getRequest = new HttpGet(buildURI(consumerGroup, consumerId));
-        HttpResponse response = httpClient.execute(getRequest);
-        checkIfResponseIsAccepted(response, correlationId);
+    private void startDmaapThreadListener() {
+        executor = Executors.newScheduledThreadPool(1);
+        executor.scheduleWithFixedDelay(this, dmaapClientInitialDelayInSeconds,
+                dmaapClientDelayInSeconds, TimeUnit.SECONDS);
+        dmaapThreadListenerIsRunning = true;
     }
 
-    private boolean checkIfResponseIsAccepted(HttpResponse response, String correlationId) {
-        // TODO parse response if contains proper correlationId
-        return false;
+    private void stopDmaapThreadListener() {
+        if (dmaapThreadListenerIsRunning) {
+            executor.shutdownNow();
+            dmaapThreadListenerIsRunning = false;
+            executor = null;
+        }
     }
 
-    private URI buildURI(String consumerGroup, String consumerId) {
+    private URI buildURI() {
         return UriBuilder.fromUri(dmaapUriPathPrefix)
                 .scheme(dmaapProtocol)
                 .host(dmaapHost)
@@ -65,6 +109,31 @@ public class PnfEventReadyConsumer {
                 .path(consumerGroup).path(consumerId).build();
     }
 
+    private Optional<String> getCorrelationIdFromResponse(HttpResponse response) throws IOException {
+        if (response.getStatusLine().getStatusCode() == 200) {
+            String responseString = EntityUtils.toString(response.getEntity(), "UTF-8");
+            if (responseString != null) {
+                return JsonPathUtil.getInstance().locateResult(responseString, JSON_PATH_CORRELATION_ID);
+            }
+        }
+        return Optional.empty();
+    }
+
+
+    private void informAboutPnfReadyIfCorrelationIdFound(String correlationId) {
+        pnfCorrelationIdToThreadMap.keySet().stream().filter(key -> key.equals(correlationId)).findAny()
+                .ifPresent(this::informAboutPnfReady);
+    }
+
+    private void informAboutPnfReady(String correlationId) {
+        pnfCorrelationIdToThreadMap.get(correlationId).run();
+        pnfCorrelationIdToThreadMap.remove(correlationId);
+
+        if (pnfCorrelationIdToThreadMap.isEmpty()) {
+            stopDmaapThreadListener();
+        }
+    }
+
     public void setDmaapHost(String dmaapHost) {
         this.dmaapHost = dmaapHost;
     }
@@ -93,4 +162,12 @@ public class PnfEventReadyConsumer {
         this.consumerGroup = consumerGroup;
     }
 
+    public void setDmaapClientInitialDelayInSeconds(int dmaapClientInitialDelayInSeconds) {
+        this.dmaapClientInitialDelayInSeconds = dmaapClientInitialDelayInSeconds;
+    }
+
+    public void setDmaapClientDelayInSeconds(int dmaapClientDelayInSeconds) {
+        this.dmaapClientDelayInSeconds = dmaapClientDelayInSeconds;
+    }
+
 }