modules/catalog/src/main/java/org/apache/ignite/internal/catalog/storage/ObjectIdGenUpdateEntry.java

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.ignite.internal.catalog.storage;

import java.io.IOException;
import org.apache.ignite.internal.catalog.Catalog;
import org.apache.ignite.internal.catalog.storage.serialization.CatalogObjectSerializer;
import org.apache.ignite.internal.catalog.storage.serialization.MarshallableEntryType;
import org.apache.ignite.internal.tostring.S;
import org.apache.ignite.internal.util.io.IgniteDataInput;
import org.apache.ignite.internal.util.io.IgniteDataOutput;

/**
 * Describes update of the object id generator.
 */
public class ObjectIdGenUpdateEntry implements UpdateEntry {
    public static final CatalogObjectSerializer<ObjectIdGenUpdateEntry> SERIALIZER = new ObjectIdGenUpdateEntrySerializer();

    private final int delta;

    /**
     * Constructs the object.
     *
     * @param delta A delta by which to correct the id generator.
     */
    public ObjectIdGenUpdateEntry(int delta) {
        this.delta = delta;
    }

    /** Returns delta by which to correct the id generator. */
    public int delta() {
        return delta;
    }

    @Override
    public Catalog applyUpdate(Catalog catalog, long causalityToken) {
        return new Catalog(
                catalog.version(),
                catalog.time(),
                catalog.objectIdGenState() + delta,
                catalog.zones(),
                catalog.schemas(),
                catalog.defaultZone().id()
        );
    }

    @Override
    public int typeId() {
        return MarshallableEntryType.ID_GENERATOR.id();
    }

    @Override
    public String toString() {
        return S.toString(this);
    }

    /**
     * Serializer for {@link ObjectIdGenUpdateEntry}.
     */
    private static class ObjectIdGenUpdateEntrySerializer implements CatalogObjectSerializer<ObjectIdGenUpdateEntry> {
        @Override
        public ObjectIdGenUpdateEntry readFrom(IgniteDataInput input) throws IOException {
            int delta = input.readInt();

            return new ObjectIdGenUpdateEntry(delta);
        }

        @Override
        public void writeTo(ObjectIdGenUpdateEntry entry, IgniteDataOutput output) throws IOException {
            output.writeInt(entry.delta());
        }
    }
}