Add calls to Datastore service

git-svn-id: http://svn.us.apache.org/repos/asf/tuscany@823799 13f79535-47bb-0310-9956-ffa450edef68

sandbox/rfeng/helloworld-jsp-google-appengine/src/sample/HelloworldServiceImpl.java

@@ -29,6 +29,12 @@ import org.oasisopen.sca.annotation.Reference;
 import org.oasisopen.sca.annotation.Scope;
 import org.oasisopen.sca.annotation.Service;
 
+import com.google.appengine.api.datastore.DatastoreService;
+import com.google.appengine.api.datastore.Entity;
+import com.google.appengine.api.datastore.EntityNotFoundException;
+import com.google.appengine.api.datastore.Key;
+import com.google.appengine.api.datastore.KeyFactory;
+import com.google.appengine.api.datastore.Transaction;
 import com.google.appengine.api.memcache.MemcacheService;
 import com.google.appengine.api.urlfetch.HTTPResponse;
 import com.google.appengine.api.urlfetch.URLFetchService;
@@ -48,6 +54,9 @@ public class HelloworldServiceImpl implements HelloworldService {
     @Reference
     protected MemcacheService memcacheService;
 
+    @Reference
+    protected DatastoreService datastoreService;
+
     public String sayHello(String name) {
         User user = userService.getCurrentUser();
         String id = (user == null) ? "" : user.getUserId();
@@ -59,6 +68,22 @@ public class HelloworldServiceImpl implements HelloworldService {
         stack.push(new Date().toString() + ": " + name);
         memcacheService.put("history", stack);
 
+        Transaction tx = datastoreService.beginTransaction();
+        Entity entity = null;
+        Key key = KeyFactory.createKey("HitCounter", "countter");
+        try {
+            entity = datastoreService.get(tx, key);
+        } catch (EntityNotFoundException e1) {
+            entity = new Entity(key);
+            entity.setProperty("counter", new Long(0));
+        }
+
+        Long count = (Long)entity.getProperty("counter");
+        entity.setProperty("counter", new Long(count.longValue() + 1));
+
+        datastoreService.put(tx, entity);
+        tx.commit();
+
         String content = "";
         try {
             HTTPResponse response = fetchService.fetch(new URL("http://tuscany.apache.org"));
@@ -76,7 +101,9 @@ public class HelloworldServiceImpl implements HelloworldService {
             + content
             + "<p>History<hr>"
             + stack
-            + "</p>";
+            + "</p><b>"
+            + count
+            + "</b>";
     }
 
     @Init

sandbox/rfeng/helloworld-jsp-google-appengine/war/WEB-INF/web.composite

@@ -25,6 +25,7 @@
         <reference name="userService" target="UserService"/>
         <reference name="fetchService" target="URLFetchService"/>
         <reference name="memcacheService" target="MemcacheService"/>
+        <reference name="datastoreService" target="DatastoreService"/>
     </component>
 
     <component name="UserService">

sandbox/rfeng/helloworld-jsp-google-appengine/war/hello.jsp

@@ -53,5 +53,8 @@ in</a> to include your name with greetings you post.</p>
 Calling HelloworldService sayHello("world, "+$user) returns:
 
 <p><%=service.sayHello("world ("+user+")")%>
+<form action="hello.jsp" method="get">
+    <input type="submit" value="Try Again">
+</form>
 </body>
 </html>