move code to src/test

* so that it compiles and tests pass
* fix some additional snip references in getting started

akka-docs/src/test/java/jdocs/ddata/protobuf/TwoPhaseSetSerializer.java

@@ -0,0 +1,92 @@
+/**
+ * Copyright (C) 2015-2017 Lightbend Inc. <http://www.lightbend.com>
+ */
+package jdocs.ddata.protobuf;
+
+//#serializer
+import jdocs.ddata.TwoPhaseSet;
+import docs.ddata.protobuf.msg.TwoPhaseSetMessages;
+import docs.ddata.protobuf.msg.TwoPhaseSetMessages.TwoPhaseSet.Builder;
+import java.util.ArrayList;
+import java.util.Collections;
+
+import akka.actor.ExtendedActorSystem;
+import akka.cluster.ddata.GSet;
+import akka.cluster.ddata.protobuf.AbstractSerializationSupport;
+
+public class TwoPhaseSetSerializer extends AbstractSerializationSupport {
+  
+  private final ExtendedActorSystem system;
+
+  public TwoPhaseSetSerializer(ExtendedActorSystem system) {
+    this.system = system;
+  }
+  
+  @Override
+  public ExtendedActorSystem system() {
+    return this.system;
+  }
+
+  @Override
+  public boolean includeManifest() {
+    return false;
+  }
+
+  @Override 
+  public int identifier() {
+    return 99998;
+  }
+
+  @Override
+  public byte[] toBinary(Object obj) {
+    if (obj instanceof TwoPhaseSet) {
+      return twoPhaseSetToProto((TwoPhaseSet) obj).toByteArray();
+    } else {
+      throw new IllegalArgumentException(
+          "Can't serialize object of type " + obj.getClass());
+    }
+  }
+
+  @Override
+  public Object fromBinaryJava(byte[] bytes, Class<?> manifest) {
+    return twoPhaseSetFromBinary(bytes);
+  }
+
+  protected TwoPhaseSetMessages.TwoPhaseSet twoPhaseSetToProto(TwoPhaseSet twoPhaseSet) {
+    Builder b = TwoPhaseSetMessages.TwoPhaseSet.newBuilder();
+    ArrayList<String> adds = new ArrayList<>(twoPhaseSet.adds.getElements());
+    if (!adds.isEmpty()) {
+      Collections.sort(adds);
+      b.addAllAdds(adds);
+    }
+    ArrayList<String> removals = new ArrayList<>(twoPhaseSet.removals.getElements());
+    if (!removals.isEmpty()) {
+      Collections.sort(removals);
+      b.addAllRemovals(removals);
+    }
+    return b.build();
+  }
+
+  protected TwoPhaseSet twoPhaseSetFromBinary(byte[] bytes) {
+    try {  
+      TwoPhaseSetMessages.TwoPhaseSet msg = 
+          TwoPhaseSetMessages.TwoPhaseSet.parseFrom(bytes);
+      GSet<String> adds = GSet.create();
+      for (String elem : msg.getAddsList()) {
+        adds = adds.add(elem);
+      }
+      GSet<String> removals = GSet.create();
+      for (String elem : msg.getRemovalsList()) {
+        removals = removals.add(elem);
+      }
+      // GSet will accumulate deltas when adding elements,
+      // but those are not of interest in the result of the deserialization
+      return new TwoPhaseSet(adds.resetDelta(), removals.resetDelta());
+    } catch (Exception e) {
+      throw new RuntimeException(e.getMessage(), e);
+    }
+  }
+}
+//#serializer
+
+