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package com.sun.grizzly.nio;
import com.sun.grizzly.CompletionHandler;
import java.io.IOException;
import java.nio.channels.ClosedChannelException;
import java.nio.channels.SelectableChannel;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.util.Set;
import java.util.concurrent.Future;
import java.util.concurrent.TimeUnit;
import com.sun.grizzly.impl.FutureImpl;
import com.sun.grizzly.utils.LinkedTransferQueue;
/**
* Default implementation of NIO SelectorHandler
*
* @author Alexey Stashok
*/
public class DefaultSelectorHandler implements SelectorHandler {
protected enum OpType {NONE, REG_CHANNEL, REG_KEY, UNREG_KEY};
protected long selectTimeout;
public DefaultSelectorHandler() {
}
public long getSelectTimeout() {
return selectTimeout;
}
public void setSelectTimeout(long selectTimeout) {
this.selectTimeout = selectTimeout;
}
public void preSelect(SelectorRunner selectorRunner) throws IOException {
processPendingOperations(selectorRunner);
}
public Set select(SelectorRunner selectorRunner)
throws IOException {
Selector selector = selectorRunner.getSelector();
selector.select(selectTimeout);
return selector.selectedKeys();
}
public void postSelect(SelectorRunner selectorRunner) throws IOException {
}
public void registerKey(SelectorRunner selectorRunner, SelectionKey key,
int interest) throws IOException {
if (Thread.currentThread() == selectorRunner.getRunnerThread()) {
registerKey0(key, interest);
} else {
SelectionKeyOperation operation = new SelectionKeyOperation();
operation.setOpType(OpType.REG_KEY);
operation.setSelectionKey(key);
operation.setInterest(interest);
addPendingOperation(selectorRunner, operation);
}
}
public void unregisterKey(SelectorRunner selectorRunner, SelectionKey key,
int interest) throws IOException {
if (Thread.currentThread() == selectorRunner.getRunnerThread()) {
unregisterKey0(key, interest);
} else {
SelectionKeyOperation operation = new SelectionKeyOperation();
operation.setOpType(OpType.UNREG_KEY);
operation.setSelectionKey(key);
operation.setInterest(interest);
addPendingOperation(selectorRunner, operation);
}
}
public void registerChannel(SelectorRunner selectorRunner,
SelectableChannel channel, int interest, Object attachment)
throws IOException {
Future future =
registerChannelAsync(selectorRunner, channel, interest,
attachment, null);
try {
future.get(selectTimeout, TimeUnit.MILLISECONDS);
} catch (Exception e) {
throw new IOException(e.getMessage());
}
}
public Future registerChannelAsync(
SelectorRunner selectorRunner, SelectableChannel channel,
int interest, Object attachment,
CompletionHandler completionHandler)
throws IOException {
FutureImpl future =
new FutureImpl();
if (Thread.currentThread() == selectorRunner.getRunnerThread()) {
registerChannel0(selectorRunner, channel, interest, attachment,
completionHandler, future);
} else {
SelectionKeyOperation operation = new SelectionKeyOperation();
operation.setOpType(OpType.REG_CHANNEL);
operation.setChannel(channel);
operation.setInterest(interest);
operation.setAttachment(attachment);
operation.setFuture(future);
operation.setCompletionHandler(completionHandler);
addPendingOperation(selectorRunner, operation);
}
return future;
}
protected void addPendingOperation(SelectorRunner selectorRunner,
SelectionKeyOperation operation) {
LinkedTransferQueue pendingSelectorOps =
selectorRunner.getPendingOperations();
pendingSelectorOps.offer(operation);
selectorRunner.wakeupSelector();
}
protected void processPendingOperations(SelectorRunner selectorRunner)
throws IOException {
LinkedTransferQueue pendingSelectorOps =
selectorRunner.getPendingOperations();
SelectionKeyOperation pendingOperation;
while((pendingOperation = pendingSelectorOps.poll()) != null) {
processPendingOperation(selectorRunner, pendingOperation);
}
}
protected void processPendingOperation(SelectorRunner selectorRunner,
SelectionKeyOperation operation) throws IOException {
OpType opType = operation.getOpType();
int interest = operation.getInterest();
switch (opType) {
case REG_CHANNEL:
registerChannel0(selectorRunner, operation.getChannel(),
interest,
operation.getAttachment(),
operation.getCompletionHandler(),
operation.getFuture());
break;
case REG_KEY:
registerKey0(operation.getSelectionKey(), interest);
break;
case UNREG_KEY:
unregisterKey0(operation.getSelectionKey(), interest);
break;
default:
throw new IllegalStateException("Unknown operation type: " +
opType);
}
}
private void registerKey0(SelectionKey selectionKey, int interest) {
if (selectionKey.isValid()) {
int currentOps = selectionKey.interestOps();
if ((currentOps & interest) != interest) {
selectionKey.interestOps(currentOps | interest);
}
}
}
private void unregisterKey0(SelectionKey selectionKey, int interest) {
if (selectionKey.isValid()) {
int currentOps = selectionKey.interestOps();
if ((currentOps & interest) != 0) {
selectionKey.interestOps(currentOps & (~interest));
}
}
}
private void registerChannel0(SelectorRunner selectorRunner,
SelectableChannel channel, int interest, Object attachment,
CompletionHandler completionHandler,
FutureImpl future) throws IOException {
if (future == null || !future.isCancelled()) {
try {
if (channel.isOpen()) {
SelectionKey registeredSelectionKey =
channel.register(selectorRunner.getSelector(),
interest,
attachment);
selectorRunner.getTransport().
getSelectionKeyHandler().
onKeyRegistered(registeredSelectionKey);
RegisterChannelResult result =
new RegisterChannelResult(selectorRunner,
registeredSelectionKey, channel);
if (completionHandler != null) {
completionHandler.completed(null, result);
}
if (future != null) {
future.setResult(result);
}
} else {
Throwable error = new ClosedChannelException();
if (completionHandler != null) {
completionHandler.failed(null, error);
}
if (future != null) {
future.failure(error);
}
}
} catch (IOException e) {
if (completionHandler != null) {
completionHandler.failed(null, e);
}
if (future != null) {
future.failure(e);
}
throw e;
}
}
}
protected static class SelectionKeyOperation {
private OpType opType;
private SelectionKey selectionKey;
private SelectableChannel channel;
private int interest;
private Object attachment;
private FutureImpl future;
private CompletionHandler completionHandler;
public OpType getOpType() {
return opType;
}
public void setOpType(OpType opType) {
this.opType = opType;
}
public SelectionKey getSelectionKey() {
return selectionKey;
}
public void setSelectionKey(SelectionKey selectionKey) {
this.selectionKey = selectionKey;
}
public SelectableChannel getChannel() {
return channel;
}
public void setChannel(SelectableChannel channel) {
this.channel = channel;
}
public int getInterest() {
return interest;
}
public void setInterest(int interest) {
this.interest = interest;
}
public Object getAttachment() {
return attachment;
}
public void setAttachment(Object attachment) {
this.attachment = attachment;
}
public FutureImpl getFuture() {
return future;
}
public void setFuture(FutureImpl future) {
this.future = future;
}
public CompletionHandler getCompletionHandler() {
return completionHandler;
}
public void setCompletionHandler(CompletionHandler completionHandler) {
this.completionHandler = completionHandler;
}
}
}
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