org.attribyte.relay.RDBSupplier.java Source code

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Here is the source code for org.attribyte.relay.RDBSupplier.java

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/*
 * Copyright 2016 Attribyte, LLC
 *
 * 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 org.attribyte.relay;

import com.codahale.metrics.Metric;
import com.google.common.base.Strings;
import com.google.common.collect.ImmutableMap;
import com.google.common.io.Files;
import org.attribyte.api.Logger;
import org.attribyte.sql.pool.ConnectionPool;
import org.attribyte.sql.pool.PasswordSource;
import org.attribyte.sql.pool.contrib.PropertiesPasswordSource;
import org.attribyte.util.InitUtil;

import java.io.ByteArrayInputStream;
import java.io.File;
import java.util.List;
import java.util.Map;
import java.util.Properties;

/**
 * A base class for creating suppliers that require a relational database.
 */
public abstract class RDBSupplier implements Supplier {

    /**
     * Called by implementation to initialize pools after construction.
     * @param props The properties.
     * @param logger The logger.
     * @throws Exception on initialization error.
     */
    protected void initPools(final Properties props, final Logger logger) throws Exception {
        InitUtil dbProps = new InitUtil("rdb.", props);
        String credentialsFilename = Strings.nullToEmpty(dbProps.getProperty("credentialsFile")).trim();
        final PasswordSource passwordSource;
        if (!credentialsFilename.isEmpty()) {
            File credentialsFile = new File(credentialsFilename);
            if (!credentialsFile.exists()) {
                throw new Exception(
                        String.format("The 'rdb.credentialsFile', '%s' does not exist", credentialsFilename));
            }

            if (!credentialsFile.canRead()) {
                throw new Exception(
                        String.format("The 'rdb.credentialsFile', '%s' can't be read", credentialsFilename));
            }

            Properties credentialsProps = new Properties();
            credentialsProps.load(new ByteArrayInputStream(Files.toByteArray(credentialsFile)));
            passwordSource = new PropertiesPasswordSource(credentialsProps);
        } else {
            passwordSource = null;
        }

        List<ConnectionPool.Initializer> initializers = ConnectionPool.Initializer
                .fromProperties(dbProps.getProperties(), passwordSource, logger);
        if (initializers.size() == 0) {
            throw new Exception("No connection pool found");
        }

        String defaultPoolName = Strings.nullToEmpty(dbProps.getProperty("defaultPoolName")).trim();

        if (defaultPoolName.isEmpty()) {
            ImmutableMap.Builder<String, ConnectionPool> connectionPools = ImmutableMap.builder();
            this.defaultConnectionPool = initializers.get(0).createPool();
            connectionPools.put(this.defaultConnectionPool.getName(), this.defaultConnectionPool);
            for (int i = 1; i < initializers.size(); i++) {
                ConnectionPool curr = initializers.get(i).createPool();
                connectionPools.put(curr.getName(), curr);
            }
            this.connectionPools = connectionPools.build();
        } else {
            ImmutableMap.Builder<String, ConnectionPool> connectionPools = ImmutableMap.builder();
            for (ConnectionPool.Initializer init : initializers) {
                ConnectionPool pool = init.createPool();
                connectionPools.put(pool.getName(), pool);
            }
            this.connectionPools = connectionPools.build();
            this.defaultConnectionPool = this.connectionPools.get(defaultPoolName);
            if (this.defaultConnectionPool == null) {
                throw new Exception(
                        String.format("The default connection pool, '%s', was not configured", defaultPoolName));
            }
        }
    }

    /**
     * Shutdown all pools - to be called by implementations during {@code shutdown}.
     */
    protected void shutdownPools() {
        for (ConnectionPool pool : connectionPools.values()) {
            pool.shutdown();
        }
    }

    @Override
    public Map<String, Metric> getMetrics() {
        ImmutableMap.Builder<String, Metric> builder = ImmutableMap.builder();
        for (ConnectionPool pool : connectionPools.values()) {
            builder.put(pool.getName(), pool.getMetrics());
        }
        return builder.build();
    }

    /**
     * The logger.
     */
    protected Logger logger;

    /**
     * The default connection pool.
     */
    protected ConnectionPool defaultConnectionPool;

    /**
     * Named connection pools.
     */
    protected Map<String, ConnectionPool> connectionPools;
}