Fix(Impression event): Resolved method post issue (#243)

* Added post method

* indentation corrected.

Author: mnoman09

core-httpclient-impl/src/main/java/com/optimizely/ab/event/AsyncEventHandler.java

@@ -177,7 +177,12 @@ private class EventDispatcher implements Runnable {
         @Override
         public void run() {
             try {
-                HttpGet request = generateRequest(logEvent);
+                HttpRequestBase request;
+                if (logEvent.getRequestMethod() == LogEvent.RequestMethod.GET) {
+                    request = generateGetRequest(logEvent);
+                } else {
+                    request = generatePostRequest(logEvent);
+                }
                 httpClient.execute(request, EVENT_RESPONSE_HANDLER);
             } catch (IOException e) {
                 logger.error("event dispatch failed", e);
@@ -189,7 +194,7 @@ public void run() {
         /**
          * Helper method that generates the event request for the given {@link LogEvent}.
          */
-        private HttpGet generateRequest(LogEvent event) throws URISyntaxException {
+        private HttpGet generateGetRequest(LogEvent event) throws URISyntaxException {
 
             URIBuilder builder = new URIBuilder(event.getEndpointUrl());
             for (Map.Entry<String, String> param : event.getRequestParams().entrySet()) {
@@ -198,23 +203,30 @@ private HttpGet generateRequest(LogEvent event) throws URISyntaxException {
 
             return new HttpGet(builder.build());
         }
-    }
-
-    /**
-     * Handler for the event request that returns nothing (i.e., Void)
-     */
-    private static final class ProjectConfigResponseHandler implements ResponseHandler<Void> {
 
-        @Override
-        public @CheckForNull Void handleResponse(HttpResponse response) throws IOException {
-            int status = response.getStatusLine().getStatusCode();
-            if (status >= 200 && status < 300) {
-                // read the response, so we can close the connection
-                response.getEntity();
-                return null;
-            } else {
-                throw new ClientProtocolException("unexpected response from event endpoint, status: " + status);
-            }
+        private HttpPost generatePostRequest(LogEvent event) throws UnsupportedEncodingException {
+            HttpPost post = new HttpPost(event.getEndpointUrl());
+            post.setEntity(new StringEntity(event.getBody()));
+            post.addHeader("Content-Type", "application/json");
+            return post;
         }
     }
-}
+
+	/**
+	 * Handler for the event request that returns nothing (i.e., Void)
+	 */
+	private static final class ProjectConfigResponseHandler implements ResponseHandler<Void> {
+
+    	@Override
+	    public @CheckForNull Void handleResponse(HttpResponse response) throws IOException {
+    	    int status = response.getStatusLine().getStatusCode();
+        	if (status >= 200 && status < 300) {
+            	// read the response, so we can close the connection
+	            response.getEntity();
+    	        return null;
+        	} else {
+            	throw new ClientProtocolException("unexpected response from event endpoint, status: " + status);
+	        }
+    	}
+	}
+}