Define efficient serialization proxies

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

diff --git a/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/persisted/DS.java b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/persisted/DS.java
new file mode 100644 (file)
index 0000000..5dc3654
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+++ b/opendaylight/md-sal/sal-distributed-datastore/src/main/java/org/opendaylight/controller/cluster/datastore/persisted/DS.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2022 PANTHEON.tech, s.r.o. 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 static com.google.common.base.Verify.verifyNotNull;
+import static java.util.Objects.requireNonNull;
+
+/**
+ * Serialization proxy for {@link DatastoreSnapshot}.
+ */
+final class DS implements DatastoreSnapshot.SerialForm {
+    private static final long serialVersionUID = 1L;
+
+    private DatastoreSnapshot datastoreSnapshot;
+
+    @SuppressWarnings("checkstyle:RedundantModifier")
+    public DS() {
+        // For Externalizable
+    }
+
+    DS(final DatastoreSnapshot datastoreSnapshot) {
+        this.datastoreSnapshot = requireNonNull(datastoreSnapshot);
+    }
+
+    @Override
+    public DatastoreSnapshot datastoreSnapshot() {
+        return datastoreSnapshot;
+    }
+
+    @Override
+    public void resolveTo(final DatastoreSnapshot newDatastoreSnapshot) {
+        datastoreSnapshot = requireNonNull(newDatastoreSnapshot);
+    }
+
+    @Override
+    public Object readResolve() {
+        return verifyNotNull(datastoreSnapshot);
+    }
+}