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/***************************************************************************
* Copyright (c) 2004 - 2009 Eike Stepper (Berlin, Germany) and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Eclipse Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/epl-v10.html
*
* Contributors:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.internal.tcp;
import org.eclipse.net4j.internal.tcp.bundle.OM;
import org.eclipse.net4j.util.om.trace.ContextTracer;
import java.nio.channels.CancelledKeyException;
import java.nio.channels.SelectionKey;
/**
* @author Eike Stepper
*/
public final class SelectorUtil
{
private static final ContextTracer TRACER = new ContextTracer(OM.DEBUG, SelectorUtil.class);
private SelectorUtil()
{
}
public static String formatInterestOps(int newOps)
{
StringBuilder builder = new StringBuilder();
if ((newOps & SelectionKey.OP_ACCEPT) != 0)
{
addInterestOp(builder, "ACCEPT"); //$NON-NLS-1$
}
if ((newOps & SelectionKey.OP_CONNECT) != 0)
{
addInterestOp(builder, "CONNECT"); //$NON-NLS-1$
}
if ((newOps & SelectionKey.OP_READ) != 0)
{
addInterestOp(builder, "READ"); //$NON-NLS-1$
}
if ((newOps & SelectionKey.OP_WRITE) != 0)
{
addInterestOp(builder, "WRITE"); //$NON-NLS-1$
}
return builder.toString();
}
public static void setInterest(SelectionKey selectionKey, int operation, boolean interested)
{
if (selectionKey == null || !selectionKey.isValid())
{
return;
}
try
{
int newOps;
int oldOps = selectionKey.interestOps();
if (interested)
{
newOps = oldOps | operation;
}
else
{
newOps = oldOps & ~operation;
}
if (oldOps != newOps)
{
if (TRACER.isEnabled())
{
TRACER.trace("Setting interest " //$NON-NLS-1$
+ formatInterestOps(newOps)
+ (oldOps == 0 ? "" : " (was " + formatInterestOps(oldOps).toLowerCase() + ")")); //$NON-NLS-1$ //$NON-NLS-2$
}
selectionKey.interestOps(newOps);
}
}
catch (CancelledKeyException ignore)
{
}
}
public static void setAcceptInterest(SelectionKey selectionKey, boolean interested)
{
setInterest(selectionKey, SelectionKey.OP_ACCEPT, interested);
}
public static void setConnectInterest(SelectionKey selectionKey, boolean interested)
{
setInterest(selectionKey, SelectionKey.OP_CONNECT, interested);
}
public static void setReadInterest(SelectionKey selectionKey, boolean interested)
{
setInterest(selectionKey, SelectionKey.OP_READ, interested);
}
public static void setWriteInterest(SelectionKey selectionKey, boolean interested)
{
setInterest(selectionKey, SelectionKey.OP_WRITE, interested);
}
private static void addInterestOp(StringBuilder builder, String op)
{
if (builder.length() != 0)
{
builder.append("|"); //$NON-NLS-1$
}
builder.append(op);
}
}
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