com.hazelcast.map.impl.ComputeEntryProcessor Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of hazelcast-jdbc Show documentation
Hazelcast JDBC Driver
The newest version!
/*
 * Copyright (c) 2008-2024, Hazelcast, Inc. All Rights Reserved.
 *
 * Licensed 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 com.hazelcast.map.impl;

import com.hazelcast.map.EntryProcessor;
import com.hazelcast.nio.ObjectDataInput;
import com.hazelcast.nio.ObjectDataOutput;
import com.hazelcast.nio.serialization.IdentifiedDataSerializable;

import java.io.IOException;
import java.util.Map;
import java.util.function.BiFunction;

/**
 * Entry processor used by Hazelcast Map to execute the Map.compute() method remotely
 *
 * @since 4.1
 */
public class ComputeEntryProcessor implements EntryProcessor, IdentifiedDataSerializable {

    BiFunction biFunction;

    public ComputeEntryProcessor() {
    }

    public ComputeEntryProcessor(BiFunction biFunction) {
        this.biFunction = biFunction;
    }

    @Override
    public V process(Map.Entry entry) {
        V oldValue = entry.getValue();
        V newValue = biFunction.apply(entry.getKey(), oldValue);

        if (oldValue != null) {
            if (newValue != null) {
                entry.setValue(newValue);
                return newValue;
            } else {
                ((LazyMapEntry) entry).remove();
            }
        } else {
            if (newValue != null) {
                entry.setValue(newValue);
                return newValue;
            }
        }

        return null;
    }

    @Override
    public int getFactoryId() {
        return MapDataSerializerHook.F_ID;
    }

    @Override
    public int getClassId() {
        return MapDataSerializerHook.COMPUTE_MAP_OPERATION_PROCESSOR;
    }

    @Override
    public void writeData(ObjectDataOutput out) throws IOException {
        out.writeObject(biFunction);
    }

    @Override
    public void readData(ObjectDataInput in) throws IOException {
        biFunction = in.readObject();
    }
}