/*
 * Copyright (c) "Neo4j"
 * Neo4j Sweden AB [http://neo4j.com]
 *
 * This file is part of Neo4j.
 *
 * Neo4j is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.neo4j.internal.batchimport.cache;

import static org.junit.jupiter.api.Assertions.assertArrayEquals;
import static org.neo4j.io.pagecache.context.EmptyVersionContextSupplier.EMPTY;

import java.io.IOException;
import org.neo4j.io.pagecache.PagedFile;
import org.neo4j.io.pagecache.context.CursorContextFactory;
import org.neo4j.io.pagecache.tracing.PageCacheTracer;

public class PageCacheByteArrayConcurrencyTest extends PageCacheNumberArrayConcurrencyTest {
    @Override
    protected Runnable wholeFileRacer(NumberArray array, int contestant) {
        return new WholeFileRacer((ByteArray) array);
    }

    @Override
    protected Runnable fileRangeRacer(NumberArray array, int contestant) {
        return new FileRangeRacer((ByteArray) array, contestant);
    }

    @Override
    protected ByteArray getNumberArray(PagedFile file) throws IOException {
        return new PageCacheByteArray(
                file, new CursorContextFactory(PageCacheTracer.NULL, EMPTY), COUNT, new byte[] {-1, -1, -1, -1}, 0);
    }

    private static class WholeFileRacer implements Runnable {
        private final ByteArray array;

        WholeFileRacer(ByteArray array) {
            this.array = array;
        }

        @Override
        public void run() {
            for (int o = 0; o < LAPS; o++) {
                for (int i = 0; i < COUNT; i++) {
                    byte[] value = {1, 2, 3, 4};
                    array.set(i, value);
                    byte[] actual = new byte[4];
                    array.get(i, actual);
                    assertArrayEquals(value, actual);
                }
            }
        }
    }

    private class FileRangeRacer implements Runnable {
        private final ByteArray array;
        private final int contestant;

        FileRangeRacer(ByteArray array, int contestant) {
            this.array = array;
            this.contestant = contestant;
        }

        @Override
        public void run() {
            for (int o = 0; o < LAPS; o++) {
                for (int i = contestant; i < COUNT; i += CONTESTANTS) {
                    byte[] value = new byte[4];
                    byte[] actual = new byte[4];
                    random.nextBytes(value);
                    array.set(i, value);
                    array.get(i, actual);
                    assertArrayEquals(value, actual);
                }
            }
        }
    }
}
