Bug 7521: Convert byte[] to ShardManagerSnapshot in DatastoreSnapshot

[controller.git] / opendaylight / md-sal / sal-distributed-datastore / src / main / java / org / opendaylight / controller / cluster / datastore / persisted / ShardManagerSnapshot.java

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/persisted/ShardManagerSnapshot.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/persisted/ShardManagerSnapshot.java
new file mode 100644 (file)
index 0000000..6bb6ea8
--- /dev/null
+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/persisted/ShardManagerSnapshot.java
@@ -0,0 +1,87 @@
+/*
+ * Copyright (c) 2017 Brocade Communications Systems, Inc. and others.  All rights reserved.
+ *
+ * This program and the accompanying materials are made available under the
+ * terms of the Eclipse Public License v1.0 which accompanies this distribution,
+ * and is available at http://www.eclipse.org/legal/epl-v10.html
+ */
+package org.opendaylight.controller.cluster.datastore.persisted;
+
+import com.google.common.collect.ImmutableList;
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.io.Serializable;
+import java.util.ArrayList;
+import java.util.List;
+import javax.annotation.Nonnull;
+
+/**
+ * Represents the persisted snapshot state for the ShardManager.
+ *
+ * @author Thomas Pantelis
+ */
+public class ShardManagerSnapshot implements Serializable {
+    private static final long serialVersionUID = 1L;
+
+    private static final class Proxy implements Externalizable {
+        private static final long serialVersionUID = 1L;
+
+        private ShardManagerSnapshot snapshot;
+
+        // checkstyle flags the public modifier as redundant which really doesn't make sense since it clearly isn't
+        // redundant. It is explicitly needed for Java serialization to be able to create instances via reflection.
+        @SuppressWarnings("checkstyle:RedundantModifier")
+        public Proxy() {
+            // For Externalizable
+        }
+
+        Proxy(final ShardManagerSnapshot snapshot) {
+            this.snapshot = snapshot;
+        }
+
+        @Override
+        public void writeExternal(ObjectOutput out) throws IOException {
+            out.writeInt(snapshot.shardList.size());
+            for (String shard: snapshot.shardList) {
+                out.writeObject(shard);
+            }
+        }
+
+        @Override
+        public void readExternal(ObjectInput in) throws IOException, ClassNotFoundException {
+            int size = in.readInt();
+            List<String> shardList = new ArrayList<>(size);
+            for (int i = 0; i < size; i++) {
+                shardList.add((String) in.readObject());
+            }
+
+            snapshot = new ShardManagerSnapshot(shardList);
+        }
+
+        private Object readResolve() {
+            return snapshot;
+        }
+    }
+
+    private final List<String> shardList;
+
+    public ShardManagerSnapshot(@Nonnull final List<String> shardList) {
+        this.shardList = ImmutableList.copyOf(shardList);
+    }
+
+    public List<String> getShardList() {
+        return this.shardList;
+    }
+
+    @SuppressWarnings("static-method")
+    private Object writeReplace() {
+        return new Proxy(this);
+    }
+
+    @Override
+    public String toString() {
+        return "ShardManagerSnapshot [ShardList = " + shardList + " ]";
+    }
+}