org.apache.kylin.measure.bitmap.BitmapSerializer Maven / Gradle / Ivy

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/*
 * 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.kylin.measure.bitmap;

import org.apache.kylin.metadata.datatype.DataType;
import org.apache.kylin.metadata.datatype.DataTypeSerializer;

import java.io.IOException;
import java.nio.ByteBuffer;

/**
 * Created by sunyerui on 15/12/1.
 */
public class BitmapSerializer extends DataTypeSerializer {

    private ThreadLocal current = new ThreadLocal<>();

    public BitmapSerializer(DataType type) {
    }

    @Override
    public void serialize(BitmapCounter value, ByteBuffer out) {
        try {
            value.writeRegisters(out);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
    }

    private BitmapCounter current() {
        BitmapCounter counter = current.get();
        if (counter == null) {
            counter = new BitmapCounter();
            current.set(counter);
        }
        return counter;
    }

    @Override
    public BitmapCounter deserialize(ByteBuffer in) {
        BitmapCounter counter = current();
        try {
            counter.readRegisters(in);
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return counter;
    }

    @Override
    public int peekLength(ByteBuffer in) {
        return current().peekLength(in);
    }

    @Override
    public int maxLength() {
        // the bitmap is non-fixed length, and we just assume 32MB here, maybe change it later
        return 32 * 1024 * 1024;
    }

    @Override
    public int getStorageBytesEstimate() {
        return current().getMemBytes();
    }
}