org.nustaq.offheap.FSTLongOffheapMap Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of fst Show documentation

A fast java serialization drop in-replacement and some serialization based utils such as Structs and OffHeap Memory.

There is a newer version: 3.0.4-jdk17

/*
 * Copyright 2014 Ruediger Moeller.
 *
 * 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 org.nustaq.offheap;

import org.nustaq.offheap.bytez.ByteSource;
import org.nustaq.offheap.bytez.bytesource.ByteArrayByteSource;
import org.nustaq.serialization.simpleapi.DefaultCoder;
import org.nustaq.serialization.simpleapi.FSTCoder;

/**
 * Created by ruedi on 15.11.14.
 *
 * Same as FSTAsciiStringOffheapMap, but uses Long as key
 * see FSTAsciiStringOffheapMap for doc.
 */
public class FSTLongOffheapMap extends FSTSerializedOffheapMap {

    public FSTLongOffheapMap(long sizeBytes, int numberOfElems, FSTCoder coder) {
        super(8, sizeBytes, numberOfElems, coder);
    }

    public FSTLongOffheapMap(String mappedFile, long sizeMemBytes, int numberOfElems, FSTCoder coder) throws Exception {
        super(mappedFile, 8, sizeMemBytes, numberOfElems, coder);
    }

    public FSTLongOffheapMap(long sizeBytes, int numberOfElems) {
        super(8, sizeBytes, numberOfElems, new DefaultCoder());
    }

    public FSTLongOffheapMap(String mappedFile, long sizeMemBytes, int numberOfElems) throws Exception {
        super(mappedFile, 8, sizeMemBytes, numberOfElems, new DefaultCoder());
    }

    byte longbyte[] = new byte[8];
    ByteSource tmpKey = new ByteArrayByteSource(longbyte);

    @Override
    public ByteSource encodeKey(Long key) {
        int count = 0;
        long v = key;
        longbyte[count++] = (byte) (v >>> 0);
        longbyte[count++] = (byte) (v >>> 8);
        longbyte[count++] = (byte) (v >>> 16);
        longbyte[count++] = (byte) (v >>> 24);
        longbyte[count++] = (byte) (v >>> 32);
        longbyte[count++] = (byte) (v >>> 40);
        longbyte[count++] = (byte) (v >>> 48);
        longbyte[count++] = (byte) (v >>> 56);
        return tmpKey;
    }
}