com.torodb.torod.impl.memory.MemoryTorodServer.java Source code

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Here is the source code for com.torodb.torod.impl.memory.MemoryTorodServer.java

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/*
 * ToroDB
 * Copyright  2014 8Kdata Technology (www.8kdata.com)
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero 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 Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 */

package com.torodb.torod.impl.memory;

import com.google.common.cache.Cache;
import com.google.common.cache.CacheBuilder;
import com.google.common.cache.RemovalNotification;
import com.google.inject.Singleton;
import com.torodb.common.util.Empty;
import com.torodb.core.services.IdleTorodbService;
import com.torodb.torod.TorodConnection;
import com.torodb.torod.TorodServer;

import java.util.concurrent.CompletableFuture;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.atomic.AtomicInteger;

import javax.inject.Inject;

/**
 *
 */
@Singleton
public class MemoryTorodServer extends IdleTorodbService implements TorodServer {

    private final MemoryData data = new MemoryData();
    private final AtomicInteger connIdGenerator = new AtomicInteger();
    private final Cache<Integer, MemoryTorodConnection> openConnections;

    @Inject
    public MemoryTorodServer(ThreadFactory threadFactory) {
        super(threadFactory);

        openConnections = CacheBuilder.newBuilder().weakValues().removalListener(this::onConnectionInvalidated)
                .build();
    }

    @Override
    public TorodConnection openConnection() {
        return new MemoryTorodConnection(this, connIdGenerator.incrementAndGet());
    }

    @Override
    public CompletableFuture<Empty> disableDataImportMode(String dbName) {
        return CompletableFuture.completedFuture(Empty.getInstance());
    }

    @Override
    public CompletableFuture<Empty> enableDataImportMode(String dbName) {
        return CompletableFuture.completedFuture(Empty.getInstance());
    }

    @Override
    protected void startUp() throws Exception {
    }

    @Override
    protected void shutDown() throws Exception {
        openConnections.invalidateAll();
        try (MemoryData.MdWriteTransaction trans = data.openWriteTransaction()) {
            trans.clear();
        }
    }

    MemoryData getData() {
        return data;
    }

    private void onConnectionInvalidated(RemovalNotification<Integer, MemoryTorodConnection> notification) {
        MemoryTorodConnection value = notification.getValue();
        if (value != null) {
            value.close();
        }
    }

    void onConnectionClosed(MemoryTorodConnection connection) {
        openConnections.invalidate(connection.getConnectionId());
    }

}