io.questdb.std.DirectIntList Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of questdb Show documentation
QuestDB is high performance SQL time series database
There is a newer version: 8.2.1
/*******************************************************************************
 *     ___                  _   ____  ____
 *    / _ \ _   _  ___  ___| |_|  _ \| __ )
 *   | | | | | | |/ _ \/ __| __| | | |  _ \
 *   | |_| | |_| |  __/\__ \ |_| |_| | |_) |
 *    \__\_\\__,_|\___||___/\__|____/|____/
 *
 *  Copyright (c) 2014-2019 Appsicle
 *  Copyright (c) 2019-2024 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.std;

import io.questdb.cairo.CairoException;
import io.questdb.cairo.Reopenable;
import io.questdb.log.Log;
import io.questdb.log.LogFactory;
import io.questdb.std.str.Utf16Sink;

import java.io.Closeable;

import static io.questdb.std.Numbers.MAX_SAFE_INT_POW_2;

public class DirectIntList implements Mutable, Closeable, Reopenable {

    private static final Log LOG = LogFactory.getLog(DirectIntList.class);
    private final long initialCapacity;
    private final int memoryTag;
    private long address;
    private long capacity;
    private long limit;
    private long pos;

    public DirectIntList(long capacity, int memoryTag) {
        this.memoryTag = memoryTag;
        this.capacity = (capacity * Integer.BYTES);
        this.address = Unsafe.malloc(this.capacity, memoryTag);
        this.pos = address;
        this.limit = pos + this.capacity;
        this.initialCapacity = this.capacity;
    }

    public void add(int x) {
        checkCapacity();
        Unsafe.getUnsafe().putInt(pos, x);
        pos += Integer.BYTES;
    }

    public final void addAll(DirectIntList that) {
        long thatSize = that.pos - that.address;
        if (limit - pos < thatSize) {
            setCapacityBytes(this.capacity + thatSize - (limit - pos));
        }
        Vect.memcpy(this.pos, that.address, thatSize);
        this.pos += thatSize;
    }

    // clear without "zeroing" memory
    public void clear() {
        pos = address;
    }

    public void clear(int b) {
        zero(b);
        pos = address;
    }

    @Override
    public void close() {
        if (address != 0) {
            address = Unsafe.free(address, capacity, memoryTag);
            limit = 0;
            pos = 0;
            capacity = 0;
        }
    }

    public int get(long p) {
        return Unsafe.getUnsafe().getInt(address + (p << 2));
    }

    // base address of native memory
    public long getAddress() {
        return address;
    }

    // capacity in INTs
    public long getCapacity() {
        return capacity >>> 2;
    }

    public void removeLast() {
        if (pos == address) {
            return;
        }
        pos -= Integer.BYTES;
    }

    @Override
    public void reopen() {
        if (address == 0) {
            resetCapacity();
        }
    }

    public void resetCapacity() {
        setCapacityBytes(initialCapacity);
    }

    public void set(long p, int v) {
        Unsafe.getUnsafe().putInt(address + (p << 2), v);
    }

    // desired capacity in INTs (not count of bytes)
    public void setCapacity(long capacity) {
        assert capacity > 0;
        setCapacityBytes(capacity << 2);
    }

    public void setPos(long p) {
        assert p * Integer.BYTES <= capacity;
        pos = address + (p << 2);
    }

    public void shrink(long newCapacity) {
        // deallocates memory but keeps reusable
        if (newCapacity < capacity) {
            setCapacityBytes(newCapacity << 2);
        }
    }

    public long size() {
        return (pos - address) >>> 2;
    }

    @Override
    public String toString() {
        Utf16Sink sb = Misc.getThreadLocalSink();
        sb.put('[');
        final int maxElementsToPrint = 1000; // Do not try to print too much, it can hang IntelliJ debugger.
        for (int i = 0, n = (int) Math.min(maxElementsToPrint, size()); i < n; i++) {
            if (i > 0) {
                sb.put(',').put(' ');
            }
            sb.put(get(i));
        }
        if (size() > maxElementsToPrint) {
            sb.put(", .. ");
        }
        sb.put(']');
        return sb.toString();
    }

    public void zero(int v) {
        Vect.memset(address, pos - address, v);
    }

    // desired capacity in bytes (not count of INT values)
    private void setCapacityBytes(long capacity) {
        if (this.capacity != capacity) {
            if ((capacity >>> 2) > MAX_SAFE_INT_POW_2) {
                throw CairoException.nonCritical().put("int list capacity overflow");
            }
            final long oldCapacity = this.capacity;
            final long oldSize = this.pos - this.address;
            try {
                long address = Unsafe.realloc(this.address, oldCapacity, capacity, memoryTag);
                this.capacity = capacity;
                this.address = address;
                this.limit = address + capacity;
                this.pos = Math.min(this.limit, address + oldSize);
                LOG.debug().$("resized [old=").$(oldCapacity).$(", new=").$(this.capacity).$(']').$();
            } catch (Throwable t) {
                close();
                throw t;
            }
        }
    }

    void checkCapacity() {
        if (pos < limit) {
            return;
        }
        setCapacityBytes(capacity << 1);
    }
}