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Bolt implementation for the Neo4j JDBC Driver

There is a newer version: 5.0.0

/*
 * Copyright (c) 2016 LARUS Business Automation [http://www.larus-ba.it]
 * 
 * This file is part of the "LARUS Integration Framework for Neo4j".
 * 

 * The "LARUS Integration Framework for Neo4j" is 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.
 * 
 * Created on 02/10/18
 */
package org.neo4j.jdbc.bolt.cache;

import org.neo4j.driver.v1.AuthToken;
import org.neo4j.driver.v1.Config;
import org.neo4j.driver.v1.Driver;

import java.net.URI;
import java.net.URISyntaxException;
import java.util.List;
import java.util.Map;
import java.util.Properties;
import java.util.concurrent.ConcurrentHashMap;
import java.util.function.Function;

/**
 * A cache for the driver instances in order to reduce the number of them.
 * In the JDBC specification the connection has the properties meanwhile in Neo4j they are on the driver.
 */
public class BoltDriverCache {

    private Map cache;
    private Function builder;

    /**
     * Setup the cache for the specific building function
     * @param builder
     */
    public BoltDriverCache(Function builder){
        this.builder = builder;
        this.cache = new ConcurrentHashMap<>();
    }

    /**
     * Get driver from cache, building it if necessary
     * @param routingUris
     * @param config
     * @param authToken
     * @param info
     * @return
     * @throws URISyntaxException
     */
    public Driver getDriver(List routingUris, Config config, AuthToken authToken, Properties info) throws URISyntaxException {
        BoltDriverCacheKey key = new BoltDriverCacheKey(routingUris, config, authToken, info);
        Driver driver = cache.get(key);
        if(null == driver){
            driver = new BoltDriverCached(builder.apply(key), this, key);
            cache.put(key, driver);
        }
        return driver;
    }

    public Driver removeFromCache(BoltDriverCacheKey key){
        return cache.remove(key);
    }

    /**
     * The internal cache, for inspection only
     * @return
     */
    public Map getCache() {
        return cache;
    }
}