com.hotels.styx.client.connectionpool.ConnectionPoolFactory Maven / Gradle / Ivy

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/**
 * Copyright (C) 2013-2018 Expedia Inc.
 *
 * 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.hotels.styx.client.connectionpool;

import com.hotels.styx.api.client.Connection;
import com.hotels.styx.api.client.ConnectionPool;
import com.hotels.styx.api.client.Origin;
import com.hotels.styx.api.metrics.MetricRegistry;

import static com.google.common.base.Preconditions.checkNotNull;

/**
 * A factory that creates connection pools using the connection pool settings supplied to the constructor.
 * 
 * It also registers metrics for the connection pools.
 */
public final class ConnectionPoolFactory implements ConnectionPool.Factory {
    private final Connection.Factory connectionFactory;
    private final ConnectionPool.Settings poolSettings;
    private final MetricRegistry metricRegistry;

    private ConnectionPoolFactory(Builder builder) {
        this.connectionFactory = checkNotNull(builder.connectionFactory);
        this.poolSettings = new ConnectionPoolSettings.Builder(checkNotNull(builder.poolSettings)).build();
        this.metricRegistry = checkNotNull(builder.metricRegistry);
    }

    @Override
    public ConnectionPool create(Origin origin) {
        return new StatsReportingConnectionPool(new SimpleConnectionPool(origin, poolSettings, connectionFactory), metricRegistry);
    }

    /**
     * Builder for connection pool factory.
     */
    public static final class Builder {
        private Connection.Factory connectionFactory;
        private ConnectionPool.Settings poolSettings;
        private MetricRegistry metricRegistry;

        public Builder connectionFactory(Connection.Factory connectionFactory) {
            this.connectionFactory = connectionFactory;
            return this;
        }

        public Builder connectionPoolSettings(ConnectionPool.Settings poolSettings) {
            this.poolSettings = poolSettings;
            return this;
        }

        public Builder metricRegistry(MetricRegistry metricRegistry) {
            this.metricRegistry = metricRegistry;
            return this;
        }

        public ConnectionPoolFactory build() {
            return new ConnectionPoolFactory(this);
        }
    }
}