io.questdb.cairo.vm.api.MemoryR Maven / Gradle / Ivy

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/*******************************************************************************
 *     ___                  _   ____  ____
 *    / _ \ _   _  ___  ___| |_|  _ \| __ )
 *   | | | | | | |/ _ \/ __| __| | | |  _ \
 *   | |_| | |_| |  __/\__ \ |_| |_| | |_) |
 *    \__\_\\__,_|\___||___/\__|____/|____/
 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2022 QuestDB
 *
 *  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 io.questdb.cairo.vm.api;

import io.questdb.std.BinarySequence;
import io.questdb.std.Long256;
import io.questdb.std.Long256Acceptor;
import io.questdb.std.Unsafe;
import io.questdb.std.str.CharSink;

import java.io.Closeable;

//readable 
public interface MemoryR extends Closeable {

    @Override
    void close();

    BinarySequence getBin(long offset);

    long getBinLen(long offset);

    boolean getBool(long offset);

    byte getByte(long offset);

    double getDouble(long offset);

    float getFloat(long offset);

    int getInt(long offset);

    long getLong(long offset);

    long getPageAddress(int pageIndex);

    int getPageCount();

    long getPageSize();

    short getShort(long offset);

    CharSequence getStr(long offset);

    CharSequence getStr2(long offset);

    Long256 getLong256A(long offset);

    void getLong256(long offset, CharSink sink);

    default void getLong256(long offset, Long256Acceptor sink) {
        long addr = addressOf(offset + Long.BYTES * 4);
        sink.setAll(
                Unsafe.getUnsafe().getLong(addr - Long.BYTES * 4),
                Unsafe.getUnsafe().getLong(addr - Long.BYTES * 3),
                Unsafe.getUnsafe().getLong(addr - Long.BYTES * 2),
                Unsafe.getUnsafe().getLong(addr - Long.BYTES)
        );
    }

    Long256 getLong256B(long offset);

    char getChar(long offset);

    int getStrLen(long offset);

    void extend(long size);

    long size();

    long addressOf(long offset);

    long offsetInPage(long offset);

    int pageIndex(long offset);

    default long hash0(long offset, long size) {
        long n = size - (size & 7);
        long h = 179426491L;
        for (long i = 0; i < n; i += 4) {
            h = (h << 5) - h + getInt(offset + i);
        }

        for (; n < size; n++) {
            h = (h << 5) - h + getByte(offset + n);
        }
        return h;
    }

    long getGrownLength();
}