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//
// ========================================================================
// Copyright (c) 1995-2018 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.io;
import java.io.IOException;
import java.nio.ByteBuffer;
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.log.Log;
import org.eclipse.jetty.util.log.Logger;
import org.eclipse.jetty.util.thread.Scheduler;
public abstract class AbstractEndPoint extends IdleTimeout implements EndPoint
{
private static final Logger LOG = Log.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);
}
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);
else
throw new IllegalStateException();
}
}
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;
}
}
}
@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);
else
throw new IllegalStateException();
}
}
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;
}
}
}
@Override
public final void close()
{
if (LOG.isDebugEnabled())
LOG.debug("close {}",this);
close(null);
}
protected 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;
}
}
}
protected void doShutdownInput()
{
}
protected void doShutdownOutput()
{
}
private void doOnClose(Throwable failure)
{
try
{
doClose();
}
finally
{
if (failure == null)
onClose();
else
onClose(failure);
}
}
protected void doClose()
{
}
protected void onClose(Throwable failure)
{
super.onClose();
_writeFlusher.onFail(failure);
_fillInterest.onFail(failure);
}
@Override
public boolean isOutputShutdown()
{
switch(_state.get())
{
case CLOSED:
case OSHUT:
case OSHUTTING:
return true;
default:
return false;
}
}
@Override
public boolean isInputShutdown()
{
switch(_state.get())
{
case CLOSED:
case ISHUT:
case ISHUTTING:
return true;
default:
return false;
}
}
@Override
public boolean isOpen()
{
switch(_state.get())
{
case CLOSED:
return false;
default:
return true;
}
}
public void checkFlush() throws IOException
{
State s=_state.get();
switch(s)
{
case OSHUT:
case OSHUTTING:
case CLOSED:
throw new IOException(s.toString());
default:
break;
}
}
public void checkFill() throws IOException
{
State s=_state.get();
switch(s)
{
case ISHUT:
case ISHUTTING:
case CLOSED:
throw new IOException(s.toString());
default:
break;
}
}
@Override
public long getCreatedTimeStamp()
{
return _created;
}
@Override
public Connection getConnection()
{
return _connection;
}
@Override
public void setConnection(Connection connection)
{
_connection = connection;
}
@Override
public boolean isOptimizedForDirectBuffers()
{
return false;
}
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 void onClose()
{
super.onClose();
_writeFlusher.onClose();
_fillInterest.onClose();
}
@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 IllegalStateException
{
_writeFlusher.write(callback, buffers);
}
protected abstract void onIncompleteFlush();
protected abstract void needsFillInterest() throws IOException;
public FillInterest getFillInterest()
{
return _fillInterest;
}
protected WriteFlusher getWriteFlusher()
{
return _writeFlusher;
}
@Override
protected void onIdleExpired(TimeoutException timeout)
{
Connection connection = _connection;
if (connection != null && !connection.onIdleExpired())
return;
boolean output_shutdown=isOutputShutdown();
boolean input_shutdown=isInputShutdown();
boolean fillFailed = _fillInterest.onFail(timeout);
boolean writeFailed = _writeFlusher.onFail(timeout);
// If the endpoint is half closed and there was no fill/write handling, then close here.
// This handles the situation where the connection has completed its close handling
// and the endpoint is half closed, but the other party does not complete the close.
// This perhaps should not check for half closed, however the servlet spec case allows
// for a dispatched servlet or suspended request to extend beyond the connections idle
// time. So if this test would always close an idle endpoint that is not handled, then
// we would need a mode to ignore timeouts for some HTTP states
if (isOpen() && (output_shutdown || input_shutdown) && !(fillFailed || writeFailed))
close();
else
LOG.debug("Ignored idle endpoint {}",this);
}
@Override
public void upgrade(Connection newConnection)
{
Connection old_connection = getConnection();
if (LOG.isDebugEnabled())
LOG.debug("{} upgrading from {} to {}", this, old_connection, newConnection);
ByteBuffer prefilled = (old_connection instanceof Connection.UpgradeFrom)
?((Connection.UpgradeFrom)old_connection).onUpgradeFrom():null;
old_connection.onClose();
old_connection.getEndPoint().setConnection(newConnection);
if (newConnection instanceof Connection.UpgradeTo)
((Connection.UpgradeTo)newConnection).onUpgradeTo(prefilled);
else if (BufferUtil.hasContent(prefilled))
throw new IllegalStateException();
newConnection.onOpen();
}
@Override
public String toString()
{
return String.format("%s->%s",toEndPointString(),toConnectionString());
}
public String toEndPointString()
{
Class c=getClass();
String name=c.getSimpleName();
while (name.length()==0 && c.getSuperclass()!=null)
{
c=c.getSuperclass();
name=c.getSimpleName();
}
return String.format("%s@%h{%s<->%s,%s,fill=%s,flush=%s,to=%d/%d}",
name,
this,
getRemoteAddress(),
getLocalAddress(),
_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
}
}
