org.eclipse.jetty.io.AbstractEndPoint Maven / Gradle / Ivy
//
// ========================================================================
// Copyright (c) 1995 Mort Bay Consulting Pty Ltd and others.
//
// This program and the accompanying materials are made available under the
// terms of the Eclipse Public License v. 2.0 which is available at
// https://www.eclipse.org/legal/epl-2.0, or the Apache License, Version 2.0
// which is available at https://www.apache.org/licenses/LICENSE-2.0.
//
// SPDX-License-Identifier: EPL-2.0 OR Apache-2.0
// ========================================================================
//
package org.eclipse.jetty.io;
import java.io.IOException;
import java.net.InetSocketAddress;
import java.net.SocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.WritePendingException;
import java.util.concurrent.TimeoutException;
import java.util.concurrent.atomic.AtomicReference;
import org.eclipse.jetty.util.BufferUtil;
import org.eclipse.jetty.util.Callback;
import org.eclipse.jetty.util.thread.Scheduler;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Partial implementation of EndPoint that uses {@link FillInterest} and {@link WriteFlusher}.
*/
public abstract class AbstractEndPoint extends IdleTimeout implements EndPoint
{
private static final Logger LOG = LoggerFactory.getLogger(AbstractEndPoint.class);
private final AtomicReference _state = new AtomicReference<>(State.OPEN);
private final long _created = System.currentTimeMillis();
private volatile Connection _connection;
private final FillInterest _fillInterest = new FillInterest()
{
@Override
protected void needsFillInterest() throws IOException
{
AbstractEndPoint.this.needsFillInterest();
}
};
private final WriteFlusher _writeFlusher = new WriteFlusher(this)
{
@Override
protected void onIncompleteFlush()
{
AbstractEndPoint.this.onIncompleteFlush();
}
};
protected AbstractEndPoint(Scheduler scheduler)
{
super(scheduler);
}
@Override
public InetSocketAddress getLocalAddress()
{
SocketAddress local = getLocalSocketAddress();
if (local instanceof InetSocketAddress)
return (InetSocketAddress)local;
return null;
}
@Override
public abstract SocketAddress getLocalSocketAddress();
@Override
public InetSocketAddress getRemoteAddress()
{
SocketAddress remote = getRemoteSocketAddress();
if (remote instanceof InetSocketAddress)
return (InetSocketAddress)remote;
return null;
}
@Override
public abstract SocketAddress getRemoteSocketAddress();
protected final void shutdownInput()
{
if (LOG.isDebugEnabled())
LOG.debug("shutdownInput {}", this);
while (true)
{
State s = _state.get();
switch (s)
{
case OPEN:
if (!_state.compareAndSet(s, State.ISHUTTING))
continue;
try
{
doShutdownInput();
}
finally
{
if (!_state.compareAndSet(State.ISHUTTING, State.ISHUT))
{
// If somebody else switched to CLOSED while we were ishutting,
// then we do the close for them
if (_state.get() == State.CLOSED)
doOnClose(null);
}
}
return;
case ISHUTTING: // Somebody else ishutting
case ISHUT: // Already ishut
return;
case OSHUTTING:
if (!_state.compareAndSet(s, State.CLOSED))
continue;
// The thread doing the OSHUT will close
return;
case OSHUT:
if (!_state.compareAndSet(s, State.CLOSED))
continue;
// Already OSHUT so we close
doOnClose(null);
return;
case CLOSED: // already closed
return;
default:
throw new IllegalStateException(s.toString());
}
}
}
@Override
public final void shutdownOutput()
{
if (LOG.isDebugEnabled())
LOG.debug("shutdownOutput {}", this);
while (true)
{
State s = _state.get();
switch (s)
{
case OPEN:
if (!_state.compareAndSet(s, State.OSHUTTING))
continue;
try
{
doShutdownOutput();
}
finally
{
if (!_state.compareAndSet(State.OSHUTTING, State.OSHUT))
{
// If somebody else switched to CLOSED while we were oshutting,
// then we do the close for them
if (_state.get() == State.CLOSED)
doOnClose(null);
}
}
return;
case ISHUTTING:
if (!_state.compareAndSet(s, State.CLOSED))
continue;
// The thread doing the ISHUT will close
return;
case ISHUT:
if (!_state.compareAndSet(s, State.CLOSED))
continue;
// Already ISHUT so we close
doOnClose(null);
return;
case OSHUTTING: // Somebody else oshutting
case OSHUT: // Already oshut
return;
case CLOSED: // already closed
return;
default:
throw new IllegalStateException(s.toString());
}
}
}
@Override
public final void close()
{
if (LOG.isDebugEnabled())
LOG.debug("close {}", this);
close(null);
}
public final void close(Throwable failure)
{
if (LOG.isDebugEnabled())
LOG.debug("close({}) {}", failure, this);
while (true)
{
State s = _state.get();
switch (s)
{
case OPEN:
case ISHUT: // Already ishut
case OSHUT: // Already oshut
if (!_state.compareAndSet(s, State.CLOSED))
continue;
doOnClose(failure);
return;
case ISHUTTING: // Somebody else ishutting
case OSHUTTING: // Somebody else oshutting
if (!_state.compareAndSet(s, State.CLOSED))
continue;
// The thread doing the IO SHUT will call doOnClose
return;
case CLOSED: // already closed
return;
default:
throw new IllegalStateException(s.toString());
}
}
}
protected void doShutdownInput()
{
}
protected void doShutdownOutput()
{
}
private void doOnClose(Throwable failure)
{
try
{
doClose();
}
finally
{
if (failure == null)
onClose();
else
onClose(failure);
}
}
protected void doClose()
{
}
@Override
public boolean isOutputShutdown()
{
return switch (_state.get())
{
case CLOSED, OSHUT, OSHUTTING -> true;
default -> false;
};
}
@Override
public boolean isInputShutdown()
{
return switch (_state.get())
{
case CLOSED, ISHUT, ISHUTTING -> true;
default -> false;
};
}
@Override
public boolean isOpen()
{
return _state.get() != State.CLOSED;
}
@Override
public long getCreatedTimeStamp()
{
return _created;
}
@Override
public Connection getConnection()
{
return _connection;
}
@Override
public void setConnection(Connection connection)
{
_connection = connection;
}
protected void reset()
{
_state.set(State.OPEN);
_writeFlusher.onClose();
_fillInterest.onClose();
}
@Override
public void onOpen()
{
if (LOG.isDebugEnabled())
LOG.debug("onOpen {}", this);
if (_state.get() != State.OPEN)
throw new IllegalStateException();
}
@Override
public final void onClose()
{
onClose(null);
}
@Override
public void onClose(Throwable failure)
{
super.onClose();
if (failure == null)
{
_writeFlusher.onClose();
_fillInterest.onClose();
}
else
{
_writeFlusher.onFail(failure);
_fillInterest.onFail(failure);
}
}
@Override
public void fillInterested(Callback callback)
{
notIdle();
_fillInterest.register(callback);
}
@Override
public boolean tryFillInterested(Callback callback)
{
notIdle();
return _fillInterest.tryRegister(callback);
}
@Override
public boolean isFillInterested()
{
return _fillInterest.isInterested();
}
@Override
public void write(Callback callback, ByteBuffer... buffers) throws WritePendingException
{
_writeFlusher.write(callback, buffers);
}
protected abstract void onIncompleteFlush();
protected abstract void needsFillInterest() throws IOException;
public FillInterest getFillInterest()
{
return _fillInterest;
}
public WriteFlusher getWriteFlusher()
{
return _writeFlusher;
}
@Override
protected void onIdleExpired(TimeoutException timeout)
{
Connection connection = _connection;
if (connection != null && !connection.onIdleExpired(timeout))
return;
boolean outputShutdown = isOutputShutdown();
boolean inputShutdown = isInputShutdown();
boolean fillFailed = _fillInterest.onFail(timeout);
boolean writeFailed = _writeFlusher.onFail(timeout);
boolean isOpen = isOpen();
if (LOG.isDebugEnabled())
LOG.debug("handled idle isOpen={} inputShutdown={} outputShutdown={} fillFailed={} writeFailed={} for {}",
isOpen,
inputShutdown,
outputShutdown,
fillFailed,
writeFailed,
this);
// If the endpoint is open and there was no fill/write handling, then close here.
if (isOpen && !(fillFailed || writeFailed))
close(timeout);
}
@Override
public void upgrade(Connection newConnection)
{
Connection oldConnection = getConnection();
ByteBuffer buffer = (oldConnection instanceof Connection.UpgradeFrom)
? ((Connection.UpgradeFrom)oldConnection).onUpgradeFrom()
: null;
oldConnection.onClose(null);
oldConnection.getEndPoint().setConnection(newConnection);
if (LOG.isDebugEnabled())
LOG.debug("{} upgrading from {} to {} with {}",
this, oldConnection, newConnection, BufferUtil.toDetailString(buffer));
if (BufferUtil.hasContent(buffer))
{
if (newConnection instanceof Connection.UpgradeTo)
((Connection.UpgradeTo)newConnection).onUpgradeTo(buffer);
else
throw new IllegalStateException("Cannot upgrade: " + newConnection + " does not implement " + Connection.UpgradeTo.class.getName());
}
newConnection.onOpen();
}
@Override
public String toString()
{
return String.format("%s@%x[%s]->[%s]", getClass().getSimpleName(), hashCode(), toEndPointString(), toConnectionString());
}
public String toEndPointString()
{
return String.format("{l=%s,r=%s,%s,fill=%s,flush=%s,to=%d/%d}",
getLocalSocketAddress(),
getRemoteSocketAddress(),
_state.get(),
_fillInterest.toStateString(),
_writeFlusher.toStateString(),
getIdleFor(),
getIdleTimeout());
}
public String toConnectionString()
{
Connection connection = getConnection();
if (connection == null) // can happen during upgrade
return "";
if (connection instanceof AbstractConnection)
return ((AbstractConnection)connection).toConnectionString();
return String.format("%s@%x", connection.getClass().getSimpleName(), connection.hashCode());
}
private enum State
{
OPEN, ISHUTTING, ISHUT, OSHUTTING, OSHUT, CLOSED
}
}
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