com.aerospike.delivery.db.base.Database.java Source code

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Here is the source code for com.aerospike.delivery.db.base.Database.java

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/*
 * Copyright 2016 Aerospike, Inc.
 *
 * Portions may be licensed to Aerospike, Inc. under one or more contributor
 * license agreements WHICH ARE COMPATIBLE WITH THE APACHE LICENSE, VERSION 2.0.
 *
 * 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 com.aerospike.delivery.db.base;

import com.aerospike.delivery.db.aerospike.AerospikeDatabase;
import com.aerospike.delivery.db.inmemory.InMemoryDatabase;
import org.apache.commons.cli.CommandLine;

import java.util.concurrent.Callable;
import java.util.concurrent.locks.ReentrantReadWriteLock;

public abstract class Database {

    protected Drones drones;
    protected Jobs jobs;

    private static Database sharedInstance; // Used only for InMemory

    // Don't change the aspect ratio if you want to use existing data in the database.
    public static final int mapWidthPx = 800;
    public static final int mapHeightPx = 800;

    public Database() {
    }

    //----------------------------------------------------------------------------------

    public static Database makeInMemoryDatabase(CommandLine commandLine) {
        return makeInMemoryDatabase();
    }

    public static Database makeInMemoryDatabase() {
        if (sharedInstance == null) {
            return sharedInstance = new InMemoryDatabase();
        } else if (!(sharedInstance instanceof InMemoryDatabase)) {
            throw new Error("There is already a shared instance for another kind of database.");
        } else {
            return sharedInstance;
        }
    }

    //- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

    public static Database makeAerospikeDatabase(CommandLine commandLine) {
        AerospikeDatabase database = new AerospikeDatabase();
        if (database.parseOptions(commandLine)) {
            return database;
        } else {
            return null;
        }
    }

    //----------------------------------------------------------------------------------

    public boolean connect() {
        return true;
    }

    public abstract boolean isConnected();

    public void close() {
    }

    public abstract void clear();

    public Drones getDrones() {
        return drones;
    }

    public Jobs getJobs() {
        return jobs;
    }

    public abstract String databaseType();

    //----------------------------------------------------------------------------------

    public static boolean withWriteLock(ReentrantReadWriteLock lock, Callable<Boolean> action) {
        lock.writeLock().lock();
        try {
            return action.call();
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        } finally {
            lock.writeLock().unlock();
        }
    }

    public static boolean withReadLock(ReentrantReadWriteLock lock, Callable<Boolean> action) {
        lock.readLock().lock();
        try {
            return action.call();
        } catch (Exception e) {
            e.printStackTrace();
            return false;
        } finally {
            lock.readLock().unlock();
        }
    }

    public static void assertWriteLocked(ReentrantReadWriteLock lock) {
        if (!lock.isWriteLocked()) {
            throw new AssertionError("Call this operation from inside withWriteLocked().");
        }
    }

    public static void assertReadLocked(ReentrantReadWriteLock lock) {
        if (lock.getReadLockCount() == 0) {
            throw new AssertionError("Call this operation from inside withReadLocked().");
        }
    }

}