MapDiagnostics.java

/*
 *      Copyright (C) 2012, 2016  higherfrequencytrading.com
 *      Copyright (C) 2016 Roman Leventov
 *
 *      This program is free software: you can redistribute it and/or modify
 *      it under the terms of the GNU Lesser General Public License as published by
 *      the Free Software Foundation, either version 3 of the License.
 *
 *      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 Lesser General Public License for more details.
 *
 *      You should have received a copy of the GNU Lesser General Public License
 *      along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

package net.openhft.chronicle.map;

import java.io.File;
import java.io.IOException;

public final class MapDiagnostics {

    public static void main(String[] args) throws IOException {
        String mapFile = args[0];
        try (ChronicleMap map = ChronicleMap.of(Object.class, Object.class)
                .createPersistedTo(new File(mapFile))) {
            printMapStats(map);
        }
    }

    public static <K, V> void printMapStats(ChronicleMap<K, V> map) {
        for (int i = 0; i < map.segments(); i++) {
            try (MapSegmentContext<K, V, ?> c = map.segmentContext(i)) {
                System.out.printf("segment %d contains %d entries\n", i, c.size());
                c.forEachSegmentEntry(e -> System.out.printf("%s, %d bytes -> %s, %d bytes\n",
                        e.key(), e.key().size(), e.value(), e.value().size()));
            }
        }
    }

    private MapDiagnostics() {}
}