xbdd.webapp.factory.ServletContextMongoClientFactory.java Source code

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Here is the source code for xbdd.webapp.factory.ServletContextMongoClientFactory.java

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/**
 * Copyright (C) 2015 Orion Health (Orchestral Development Ltd)
 *
 * 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 xbdd.webapp.factory;

import java.net.UnknownHostException;
import java.util.Arrays;
import java.util.Objects;

import javax.inject.Singleton;
import javax.servlet.ServletContext;
import javax.ws.rs.core.Context;

import org.apache.commons.lang.math.NumberUtils;
import org.glassfish.hk2.api.Factory;

import com.mongodb.MongoClient;
import com.mongodb.MongoCredential;
import com.mongodb.ServerAddress;

/**
 * Factory for {@link MongoClient} that retrieves hostname and port parameters from the ServletContext. The {@link MongoClient} is designed
 * to be used a {@link Singleton}. <br>
 * To specify a hostname, port number, username and password for the mongo db connection you can add parameters
 * <code>xbdd.mongo.hostname</code>, <code>xbdd.monogo.port</code>, <code>xbdd.monogo.username</code> and <code>xbdd.monogo.password</code>.
 * The parameters are optional and will default to the mongo defaults {@link ServerAddress#defaultHost()} and
 * {@link ServerAddress#defaultPort()} respectively.
 *
 */
public class ServletContextMongoClientFactory implements Factory<MongoDBAccessor> {

    private static final String XBDD_MONGO_HOSTNAME_INIT_PARAMETER = "xbdd.mongo.hostname";
    private static final String XBDD_MONGO_USERNAME_INIT_PARAMETER = "xbdd.mongo.username";
    private static final String XBDD_MONGO_PASSWORD_INIT_PARAMETER = "xbdd.mongo.password";
    private static final String XBDD_MONGO_PORT_INIT_PARAMETER = "xbdd.mongo.port";

    private final String host;
    private final int port;
    private final String username;
    private final char[] password;

    public ServletContextMongoClientFactory(@Context final ServletContext context) {
        this.host = Objects.toString(context.getInitParameter(XBDD_MONGO_HOSTNAME_INIT_PARAMETER),
                ServerAddress.defaultHost());
        this.username = context.getInitParameter(XBDD_MONGO_USERNAME_INIT_PARAMETER);
        this.password = context.getInitParameter(XBDD_MONGO_PASSWORD_INIT_PARAMETER) != null
                ? context.getInitParameter(XBDD_MONGO_PASSWORD_INIT_PARAMETER).toCharArray()
                : null;
        this.port = NumberUtils.isNumber(context.getInitParameter(XBDD_MONGO_PORT_INIT_PARAMETER))
                ? Integer.parseInt(context.getInitParameter(XBDD_MONGO_PORT_INIT_PARAMETER))
                : ServerAddress.defaultPort();
    }

    private MongoDBAccessor getMongoDBAccessor() throws UnknownHostException {
        final MongoClient mc;
        if (this.username != null) {
            MongoCredential credentials = MongoCredential.createMongoCRCredential(this.username, "admin",
                    this.password);
            mc = new MongoClient(new ServerAddress(this.host, this.port), Arrays.asList(credentials));
        } else {
            mc = new MongoClient(this.host, this.port);
        }

        return new MongoDBAccessor(mc);
    }

    @Override
    public void dispose(final MongoDBAccessor client) {
        client.close();
    }

    @Override
    public MongoDBAccessor provide() {
        try {
            return getMongoDBAccessor();
        } catch (final UnknownHostException e) {
            throw new RuntimeException(e);
        }
    }

}