Merge pull request #14 from irstevenson/doc-updates-fileconfig-test

Added test for `StartupSettings` and documentation of use - in `README.md`

src/test/java/io/teknek/gossip/StartupSettingsTest.java

@@ -0,0 +1,79 @@
+package io.teknek.gossip;
+
+import com.google.code.gossip.GossipMember;
+import com.google.code.gossip.GossipService;
+import com.google.code.gossip.GossipSettings;
+import com.google.code.gossip.StartupSettings;
+import org.apache.log4j.Logger;
+import org.json.JSONException;
+import org.junit.Test;
+
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.UUID;
+import java.util.concurrent.TimeUnit;
+
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Tests support of using {@code StartupSettings} and thereby reading
+ * setup config from file.
+ */
+public class StartupSettingsTest {
+  private static final Logger log = Logger.getLogger( StartupSettingsTest.class );
+
+  @Test
+  public void testUsingSettingsFile() throws IOException, InterruptedException, JSONException {
+    File settingsFile = File.createTempFile("gossipTest",".json");
+    log.debug( "Using settings file: " + settingsFile.getAbsolutePath() );
+    settingsFile.deleteOnExit();
+    writeSettingsFile(settingsFile);
+
+    // Start the other simple node that the settings file points to
+    GossipService firstService = new GossipService(
+      "127.0.0.1", 50000, UUID.randomUUID().toString(),
+      new ArrayList<GossipMember>(), new GossipSettings(), null
+    );
+    firstService.start();
+
+    // Start a node with the settings file
+    GossipService serviceUnderTest = new GossipService(
+      StartupSettings.fromJSONFile( settingsFile )
+    );
+    serviceUnderTest.start();
+
+    // Let the sync up
+    TimeUnit.SECONDS.sleep(2);
+
+    // Check the results
+    assertEquals(1, firstService.get_gossipManager().getMemberList().size() );
+    assertEquals(1, serviceUnderTest.get_gossipManager().getMemberList().size() );
+    assertTrue(
+      firstService.get_gossipManager().getMemberList().size() ==
+      serviceUnderTest.get_gossipManager().getMemberList().size() );
+
+    firstService.shutdown();
+    serviceUnderTest.shutdown();
+  }
+
+  private void writeSettingsFile( File target ) throws IOException {
+    String settings =
+            "[{\n" + // It is odd that this is meant to be in an array, but oh well.
+            "  \"id\":\"" + UUID.randomUUID() + "\",\n" +
+            "  \"port\":50001,\n" +
+            "  \"gossip_interval\":1000,\n" +
+            "  \"cleanup_interval\":10000,\n" +
+            "  \"members\":[\n" +
+            "    {\"host\":\"127.0.0.1\", \"port\":50000}\n" +
+            "  ]\n" +
+            "}]";
+
+    log.info( "Using settings file with contents of:\n---\n" + settings + "\n---" );
+    FileOutputStream output = new FileOutputStream(target);
+    output.write( settings.getBytes() );
+    output.close();
+  }
+}

src/test/java/io/teknek/gossip/TenNodeThreeSeedTest.java

@@ -52,11 +52,12 @@ public class TenNodeThreeSeedTest {
               new GossipListener(){
         @Override
         public void gossipEvent(GossipMember member, GossipState state) {
-          System.out.println(member+" "+ state);
+          log.info(member+" "+ state);
         }
       });
       clients.add(gossipService);
       gossipService.start();
+      gossipService.get_gossipManager().getMemberList();
     }
     TUnit.assertThat(new Callable<Integer> (){
       public Integer call() throws Exception {