GOSSIP-36 Persist ring state

src/test/java/org/apache/gossip/manager/UserDataPersistenceTest.java

@@ -0,0 +1,113 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.apache.gossip.manager;
+
+import java.io.File;
+import java.net.URI;
+import java.net.URISyntaxException;
+import java.net.UnknownHostException;
+import java.util.Arrays;
+import java.util.HashMap;
+import java.util.concurrent.ConcurrentHashMap;
+
+import org.apache.gossip.GossipService;
+import org.apache.gossip.GossipSettings;
+import org.apache.gossip.model.GossipDataMessage;
+import org.apache.gossip.model.SharedGossipDataMessage;
+import org.junit.Assert;
+import org.junit.Test;
+
+import com.codahale.metrics.MetricRegistry;
+
+public class UserDataPersistenceTest {
+
+  @Test
+  public void givenThatRingIsPersisted() throws UnknownHostException, InterruptedException, URISyntaxException {
+    String nodeId = "1";
+    GossipSettings settings = new GossipSettings();
+    { //Create a gossip service and force it to persist its user data
+      GossipService gossipService = new GossipService("a",
+              new URI("udp://" + "127.0.0.1" + ":" + (29000 + 1)), nodeId, new HashMap<String, String>(),
+              Arrays.asList(), settings, (a, b) -> { }, new MetricRegistry());
+      gossipService.start();
+      gossipService.gossipPerNodeData(getToothpick());
+      gossipService.gossipSharedData(getAnotherToothpick());
+      gossipService.getGossipManager().getUserDataState().writePerNodeToDisk();
+      gossipService.getGossipManager().getUserDataState().writeSharedToDisk();
+      { //read the raw data and confirm
+        ConcurrentHashMap<String, ConcurrentHashMap<String, GossipDataMessage>> l = gossipService.getGossipManager().getUserDataState().readPerNodeFromDisk();
+        Assert.assertEquals("red", ((AToothpick) l.get(nodeId).get("a").getPayload()).getColor());
+      }
+      {
+        ConcurrentHashMap<String, SharedGossipDataMessage> l = 
+                gossipService.getGossipManager().getUserDataState().readSharedDataFromDisk();
+        Assert.assertEquals("blue", ((AToothpick) l.get("a").getPayload()).getColor());
+      }
+      gossipService.shutdown();
+    }
+    { //recreate the service and see that the data is read back in
+      GossipService gossipService = new GossipService("a",
+              new URI("udp://" + "127.0.0.1" + ":" + (29000 + 1)), nodeId, new HashMap<String, String>(),
+              Arrays.asList(), settings, (a, b) -> { }, new MetricRegistry());
+      gossipService.start();
+      Assert.assertEquals("red", ((AToothpick) gossipService.findPerNodeData(nodeId, "a").getPayload()).getColor());
+      Assert.assertEquals("blue", ((AToothpick) gossipService.findSharedData("a").getPayload()).getColor());
+      File f = gossipService.getGossipManager().getUserDataState().computeSharedTarget();
+      File g = gossipService.getGossipManager().getUserDataState().computePerNodeTarget();
+      gossipService.shutdown();
+      f.delete();
+      g.delete();
+    }
+  }
+  
+  public GossipDataMessage getToothpick(){
+    AToothpick a = new AToothpick();
+    a.setColor("red");
+    GossipDataMessage d = new GossipDataMessage();
+    d.setExpireAt(Long.MAX_VALUE);
+    d.setKey("a");
+    d.setPayload(a);
+    d.setTimestamp(System.currentTimeMillis());
+    return d;
+  }
+  
+  public SharedGossipDataMessage getAnotherToothpick(){
+    AToothpick a = new AToothpick();
+    a.setColor("blue");
+    SharedGossipDataMessage d = new SharedGossipDataMessage();
+    d.setExpireAt(Long.MAX_VALUE);
+    d.setKey("a");
+    d.setPayload(a);
+    d.setTimestamp(System.currentTimeMillis());
+    return d;
+  }
+  
+  public static class AToothpick {
+    private String color;
+    public AToothpick(){
+      
+    }
+    public String getColor() {
+      return color;
+    }
+    public void setColor(String color) {
+      this.color = color;
+    }
+    
+  }
+}