--- /dev/null
+/*
+ * 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 com.google.common.collect.ImmutableList;
+import java.io.Externalizable;
+import java.io.IOException;
+import java.io.ObjectInput;
+import java.io.ObjectOutput;
+import java.util.List;
+
+/**
+ * Externalizable proxy for {@link FrontendShardDataTreeSnapshotMetadata}.
+ */
+final class FM implements Externalizable {
+ private static final long serialVersionUID = 1L;
+
+ private List<FrontendClientMetadata> clients;
+
+ @SuppressWarnings("checkstyle:RedundantModifier")
+ public FM() {
+ // For Externalizable
+ }
+
+ FM(final FrontendShardDataTreeSnapshotMetadata metadata) {
+ clients = metadata.getClients();
+ }
+
+ @Override
+ public void writeExternal(final ObjectOutput out) throws IOException {
+ out.writeInt(clients.size());
+ for (var c : clients) {
+ c.writeTo(out);
+ }
+ }
+
+ @Override
+ public void readExternal(final ObjectInput in) throws IOException {
+ final int size = in.readInt();
+ final var builder = ImmutableList.<FrontendClientMetadata>builderWithExpectedSize(size);
+ for (int i = 0; i < size ; ++i) {
+ builder.add(FrontendClientMetadata.readFrom(in));
+ }
+ clients = builder.build();
+ }
+
+ private Object readResolve() {
+ return new FrontendShardDataTreeSnapshotMetadata(clients);
+ }
+}
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