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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.fs4.mplex;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.logging.Logger;
import java.util.Iterator;
import java.util.Timer;
import java.util.TimerTask;
import com.yahoo.log.LogLevel;
/**
* Pool of FS4 connections.
*
* @author Tony Vaagenes
*/
public class ConnectionPool {
private final static int CLEANINGPERIOD = 1000; // Execute every second
private final Queue<FS4Connection> connections = new ConcurrentLinkedQueue<>();
private final AtomicInteger activeConnections = new AtomicInteger(0);
private final AtomicInteger passiveConnections = new AtomicInteger(0);
private static final Logger log = Logger.getLogger(ConnectionPool.class.getName());
class PoolCleanerTask extends TimerTask {
private final ConnectionPool connectionPool;
public PoolCleanerTask(ConnectionPool connectionPool) {
this.connectionPool = connectionPool;
}
public void run() {
try {
connectionPool.dropInvalidConnections();
} catch (Exception e) {
log.log(LogLevel.WARNING,
"Caught exception in connection pool cleaner, ignoring.",
e);
}
}
}
public ConnectionPool() {
}
public ConnectionPool(Timer timer) {
timer.schedule(new PoolCleanerTask(this), CLEANINGPERIOD, CLEANINGPERIOD);
}
private void dropInvalidConnections() {
for (Iterator<FS4Connection> i = connections.iterator(); i.hasNext();) {
FS4Connection connection = i.next();
if (!connection.isValid()) {
i.remove();
}
}
}
private FS4Connection registerAsActiveIfNonZero(FS4Connection connection) {
activeConnections.incrementAndGet();
passiveConnections.decrementAndGet();
return connection;
}
public FS4Connection getConnection() {
return registerAsActiveIfNonZero(connections.poll());
}
void releaseConnection(FS4Connection connection) {
assert(connection != null);
activeConnections.decrementAndGet();
if (connection.isValid()) {
passiveConnections.incrementAndGet();
connections.add(connection);
}
}
void createdConnection() {
activeConnections.incrementAndGet();
}
int activeConnections() {
return activeConnections.get();
}
//unused connections in the pool
int passiveConnections() {
return passiveConnections.get();
}
}
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