/*
* 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 org.apache.synapse.transport.nhttp.util;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.http.impl.nio.reactor.DefaultListeningIOReactor;
import java.io.IOException;
public class ActiveConnectionMonitor implements Runnable {
private static final Log log = LogFactory.getLog(ActiveConnectionMonitor.class);
/* Delay between each monitoring tasks */
private NhttpMetricsCollector nhttpMetricsCollector;
private DefaultListeningIOReactor ioReactor;
/* Maximum Active Connections */
private int maxActive;
public ActiveConnectionMonitor(NhttpMetricsCollector metrics, DefaultListeningIOReactor ior, int maxActiveConnections) {
ioReactor = ior;
nhttpMetricsCollector = metrics;
maxActive = maxActiveConnections;
}
public void run() {
try {
if (maxActive > 0) {
if (log.isDebugEnabled()) {
log.debug("Active Connection Count : " + nhttpMetricsCollector.getActiveConnectionCount());
}
if (nhttpMetricsCollector.getActiveConnectionCount() > maxActive) {
log.warn("Pausing the Listening IOReactor : Too many open connections than the max_open_connections limit.");
ioReactor.pause();
} else {
ioReactor.resume();
}
}
} catch (IOException e) {
log.warn("Active Connection Monitor Task - IO Error while pausing/resuming the IOReactor ");
}
}
}