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/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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 okhttp3.internal;

import java.util.concurrent.TimeUnit;
import okhttp3.ConnectionPool;

/**
 * A shared connection pool that uses system properties for tuning parameters:
 *
 * 
 *     {@code http.keepAlive} true if HTTP and SPDY connections should be pooled at all. Default
 *         is true.
 *     
{@code http.maxConnections} maximum number of idle connections to each to keep in the
 *         pool. Default is 5.
 *     
{@code http.keepAliveDuration} Time in milliseconds to keep the connection alive in the
 *         pool before closing it. Default is 5 minutes. This property isn't used by {@code
 *         HttpURLConnection}.
 * 
 *
 * The default instance doesn't adjust its configuration as system properties are changed.
 * This assumes that the applications that set these parameters do so before making HTTP
 * connections, and that this class is initialized lazily.
 */
public final class SystemPropertiesConnectionPool {
  private static final long DEFAULT_KEEP_ALIVE_DURATION_MS = 5 * 60 * 1000; // 5 min

  public static final ConnectionPool INSTANCE;
  static {
    String keepAlive = System.getProperty("http.keepAlive");
    int maxIdleConnections;
    if (keepAlive != null && !Boolean.parseBoolean(keepAlive)) {
      maxIdleConnections = 0;
    } else {
      String maxIdleConnectionsString = System.getProperty("http.maxConnections");
      if (maxIdleConnectionsString != null) {
        maxIdleConnections = Integer.parseInt(maxIdleConnectionsString);
      } else {
        maxIdleConnections = 5;
      }
    }

    String keepAliveDurationString = System.getProperty("http.keepAliveDuration");
    long keepAliveDurationMs = keepAliveDurationString != null
        ? Long.parseLong(keepAliveDurationString)
        : DEFAULT_KEEP_ALIVE_DURATION_MS;

    INSTANCE = new ConnectionPool(maxIdleConnections, keepAliveDurationMs, TimeUnit.MILLISECONDS);
  }

  private SystemPropertiesConnectionPool() {
  }
}