| // |
| // ======================================================================== |
| // Copyright (c) 1995-2015 Mort Bay Consulting Pty. Ltd. |
| // ------------------------------------------------------------------------ |
| // All rights reserved. This program and the accompanying materials |
| // are made available under the terms of the Eclipse Public License v1.0 |
| // and Apache License v2.0 which accompanies this distribution. |
| // |
| // The Eclipse Public License is available at |
| // http://www.eclipse.org/legal/epl-v10.html |
| // |
| // The Apache License v2.0 is available at |
| // http://www.opensource.org/licenses/apache2.0.php |
| // |
| // You may elect to redistribute this code under either of these licenses. |
| // ======================================================================== |
| // |
| |
| package org.eclipse.jetty.client; |
| |
| import java.util.Collection; |
| import java.util.concurrent.atomic.AtomicBoolean; |
| import java.util.concurrent.atomic.AtomicInteger; |
| |
| import org.eclipse.jetty.client.api.Connection; |
| import org.eclipse.jetty.client.api.Destination; |
| import org.eclipse.jetty.util.Callback; |
| import org.eclipse.jetty.util.Promise; |
| import org.eclipse.jetty.util.annotation.ManagedAttribute; |
| import org.eclipse.jetty.util.component.ContainerLifeCycle; |
| import org.eclipse.jetty.util.component.Dumpable; |
| import org.eclipse.jetty.util.log.Log; |
| import org.eclipse.jetty.util.log.Logger; |
| |
| public abstract class AbstractConnectionPool implements ConnectionPool, Dumpable |
| { |
| private static final Logger LOG = Log.getLogger(AbstractConnectionPool.class); |
| |
| private final AtomicBoolean closed = new AtomicBoolean(); |
| private final AtomicInteger connectionCount = new AtomicInteger(); |
| private final Destination destination; |
| private final int maxConnections; |
| private final Callback requester; |
| |
| protected AbstractConnectionPool(Destination destination, int maxConnections, Callback requester) |
| { |
| this.destination = destination; |
| this.maxConnections = maxConnections; |
| this.requester = requester; |
| } |
| |
| @ManagedAttribute(value = "The max number of connections", readonly = true) |
| public int getMaxConnectionCount() |
| { |
| return maxConnections; |
| } |
| |
| @ManagedAttribute(value = "The number of connections", readonly = true) |
| public int getConnectionCount() |
| { |
| return connectionCount.get(); |
| } |
| |
| @Override |
| public boolean isEmpty() |
| { |
| return connectionCount.get() == 0; |
| } |
| |
| @Override |
| public boolean isClosed() |
| { |
| return closed.get(); |
| } |
| |
| @Override |
| public Connection acquire() |
| { |
| Connection connection = activate(); |
| if (connection == null) |
| connection = tryCreate(); |
| return connection; |
| } |
| |
| private Connection tryCreate() |
| { |
| while (true) |
| { |
| int current = getConnectionCount(); |
| final int next = current + 1; |
| |
| if (next > maxConnections) |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Max connections {}/{} reached", current, maxConnections); |
| // Try again the idle connections |
| return activate(); |
| } |
| |
| if (connectionCount.compareAndSet(current, next)) |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Connection {}/{} creation", next, maxConnections); |
| |
| destination.newConnection(new Promise<Connection>() |
| { |
| @Override |
| public void succeeded(Connection connection) |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Connection {}/{} creation succeeded {}", next, maxConnections, connection); |
| onCreated(connection); |
| proceed(); |
| } |
| |
| @Override |
| public void failed(Throwable x) |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Connection " + next + "/" + maxConnections + " creation failed", x); |
| connectionCount.decrementAndGet(); |
| requester.failed(x); |
| } |
| }); |
| |
| // Try again the idle connections |
| return activate(); |
| } |
| } |
| } |
| |
| protected abstract void onCreated(Connection connection); |
| |
| protected void proceed() |
| { |
| requester.succeeded(); |
| } |
| |
| protected abstract Connection activate(); |
| |
| protected Connection active(Connection connection) |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Connection active {}", connection); |
| acquired(connection); |
| return connection; |
| } |
| |
| protected void acquired(Connection connection) |
| { |
| } |
| |
| protected boolean idle(Connection connection, boolean close) |
| { |
| if (close) |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Connection idle close {}", connection); |
| return false; |
| } |
| else |
| { |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Connection idle {}", connection); |
| return true; |
| } |
| } |
| |
| protected void released(Connection connection) |
| { |
| } |
| |
| protected void removed(Connection connection) |
| { |
| int pooled = connectionCount.decrementAndGet(); |
| if (LOG.isDebugEnabled()) |
| LOG.debug("Connection removed {} - pooled: {}", connection, pooled); |
| } |
| |
| @Override |
| public void close() |
| { |
| if (closed.compareAndSet(false, true)) |
| { |
| connectionCount.set(0); |
| } |
| } |
| |
| protected void close(Collection<Connection> connections) |
| { |
| connections.forEach(Connection::close); |
| } |
| |
| @Override |
| public String dump() |
| { |
| return ContainerLifeCycle.dump(this); |
| } |
| } |