下面列出了怎么用java.nio.channels.ClosedSelectorException的API类实例代码及写法，或者点击链接到github查看源代码。
@Test(timeout = 10_000)
public void testRunException() throws InterruptedException {
AtomicBoolean atb = new AtomicBoolean(true);
TaskInbound ti =
new TaskInbound(p2pLOG, surveyLog, p2pMgr, selector, atb, nodeMgr, hldrMap, rhs1, msgInQue);
assertNotNull(ti);
doThrow(ClosedSelectorException.class).when(selector).selectNow();
Thread t = new Thread(ti);
t.start();
assertTrue(t.isAlive());
Thread.sleep(50);
atb.set(false);
while (!t.getState().toString().contains("TERMINATED")) {
Thread.sleep(10);
}
}
@Test(timeout = 10_000)
public void testRunClosedSelectorException() throws InterruptedException {
AtomicBoolean atb = new AtomicBoolean(true);
TaskInbound ti =
new TaskInbound(p2pLOG, surveyLog, p2pMgr, selector, atb, nodeMgr, hldrMap, rhs1, msgInQue);
assertNotNull(ti);
when(selector.selectNow()).thenReturn(1);
when(selector.selectedKeys()).thenThrow(ClosedSelectorException.class);
Thread t = new Thread(ti);
t.start();
assertTrue(t.isAlive());
Thread.sleep(50);
atb.set(false);
while (!t.getState().toString().contains("TERMINATED")) {
Thread.sleep(10);
}
}
private void closeAllConnections()
{
try
{
if (serverSelector != null)
{
for (SelectionKey currentKey : serverSelector.keys())
{
closeConnection(currentKey, false, true);
}
serverSelector.close();
}
}
catch (ClosedSelectorException selectExc)
{
// Cannot close any connections, because the selector is inoperative
errorReporter.reportError(selectExc);
}
catch (IOException ioExc)
{
// If close() fails with an I/O error, the reason may be interesting
// enough to file an error report
errorReporter.reportError(ioExc);
}
}
private void transitionMethods() {
try {
Iterator<SelectionKey> keys = selector.selectedKeys().iterator();
while (keys.hasNext()) {
SelectionKey key = keys.next();
keys.remove();
if (!key.isValid()) {
// this can happen if the method call experienced an error and the
// key was cancelled. can also happen if we timeout a method, which
// results in a channel close.
// just skip
continue;
}
TAsyncMethodCall methodCall = (TAsyncMethodCall)key.attachment();
methodCall.transition(key);
// If done or error occurred, remove from timeout watch set
if (methodCall.isFinished() || methodCall.getClient().hasError()) {
timeoutWatchSet.remove(methodCall);
}
}
} catch (ClosedSelectorException e) {
LOGGER.error("Caught ClosedSelectorException in TAsyncClientManager!", e);
}
}
private void transitionMethods() {
try {
Iterator<SelectionKey> keys = selector.selectedKeys().iterator();
while (keys.hasNext()) {
SelectionKey key = keys.next();
keys.remove();
if (!key.isValid()) {
// this can happen if the method call experienced an error and the
// key was cancelled. can also happen if we timeout a method, which
// results in a channel close.
// just skip
continue;
}
TAsyncMethodCall methodCall = (TAsyncMethodCall)key.attachment();
methodCall.transition(key);
// If done or error occurred, remove from timeout watch set
if (methodCall.isFinished() || methodCall.getClient().hasError()) {
timeoutWatchSet.remove(methodCall);
}
}
} catch (ClosedSelectorException e) {
LOGGER.error("Caught ClosedSelectorException in TAsyncClientManager!", e);
}
}
private static void run(final AsyncServer server, final SelectorWrapper selector, final PriorityQueue<Scheduled> queue) {
// Log.i(LOGTAG, "****AsyncServer is starting.****");
// at this point, this local queue and selector are owned
// by this thread.
// if a stop is called, the instance queue and selector
// will be replaced and nulled respectively.
// this will allow the old queue and selector to shut down
// gracefully, while also allowing a new selector thread
// to start up while the old one is still shutting down.
while(true) {
try {
runLoop(server, selector, queue);
}
catch (AsyncSelectorException e) {
if (!(e.getCause() instanceof ClosedSelectorException))
Log.i(LOGTAG, "Selector exception, shutting down", e);
StreamUtility.closeQuietly(selector);
}
// see if we keep looping, this must be in a synchronized block since the queue is accessed.
synchronized (server) {
if (selector.isOpen() && (selector.keys().size() > 0 || queue.size() > 0))
continue;
shutdownEverything(selector);
if (server.mSelector == selector) {
server.mQueue = new PriorityQueue<Scheduled>(1, Scheduler.INSTANCE);
server.mSelector = null;
server.mAffinity = null;
}
break;
}
}
// Log.i(LOGTAG, "****AsyncServer has shut down.****");
}
protected int doSelect(long timeout) throws IOException {
if (channelArray == null)
throw new ClosedSelectorException();
this.timeout = timeout; // set selector timeout
processDeregisterQueue();
if (interruptTriggered) {
resetWakeupSocket();
return 0;
}
// Calculate number of helper threads needed for poll. If necessary
// threads are created here and start waiting on startLock
adjustThreadsCount();
finishLock.reset(); // reset finishLock
// Wakeup helper threads, waiting on startLock, so they start polling.
// Redundant threads will exit here after wakeup.
startLock.startThreads();
// do polling in the main thread. Main thread is responsible for
// first MAX_SELECTABLE_FDS entries in pollArray.
try {
begin();
try {
subSelector.poll();
} catch (IOException e) {
finishLock.setException(e); // Save this exception
}
// Main thread is out of poll(). Wakeup others and wait for them
if (threads.size() > 0)
finishLock.waitForHelperThreads();
} finally {
end();
}
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
finishLock.checkForException();
processDeregisterQueue();
int updated = updateSelectedKeys();
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
resetWakeupSocket();
return updated;
}
protected void implRegister(SelectionKeyImpl ski) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
growIfNeeded();
channelArray[totalChannels] = ski;
ski.setIndex(totalChannels);
fdMap.put(ski);
keys.add(ski);
pollWrapper.addEntry(totalChannels, ski);
totalChannels++;
}
}
public void putEventOps(SelectionKeyImpl sk, int ops) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
// make sure this sk has not been removed yet
int index = sk.getIndex();
if (index == -1)
throw new CancelledKeyException();
pollWrapper.putEventOps(index, ops);
}
}
protected int doSelect(long timeout) throws IOException {
if (channelArray == null)
throw new ClosedSelectorException();
this.timeout = timeout; // set selector timeout
processDeregisterQueue();
if (interruptTriggered) {
resetWakeupSocket();
return 0;
}
// Calculate number of helper threads needed for poll. If necessary
// threads are created here and start waiting on startLock
adjustThreadsCount();
finishLock.reset(); // reset finishLock
// Wakeup helper threads, waiting on startLock, so they start polling.
// Redundant threads will exit here after wakeup.
startLock.startThreads();
// do polling in the main thread. Main thread is responsible for
// first MAX_SELECTABLE_FDS entries in pollArray.
try {
begin();
try {
subSelector.poll();
} catch (IOException e) {
finishLock.setException(e); // Save this exception
}
// Main thread is out of poll(). Wakeup others and wait for them
if (threads.size() > 0)
finishLock.waitForHelperThreads();
} finally {
end();
}
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
finishLock.checkForException();
processDeregisterQueue();
int updated = updateSelectedKeys();
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
resetWakeupSocket();
return updated;
}
protected void implRegister(SelectionKeyImpl ski) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
growIfNeeded();
channelArray[totalChannels] = ski;
ski.setIndex(totalChannels);
fdMap.put(ski);
keys.add(ski);
pollWrapper.addEntry(totalChannels, ski);
totalChannels++;
}
}
public void putEventOps(SelectionKeyImpl sk, int ops) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
// make sure this sk has not been removed yet
int index = sk.getIndex();
if (index == -1)
throw new CancelledKeyException();
pollWrapper.putEventOps(index, ops);
}
}
@Override
public int read(byte[] dest, int offset, int max) throws IOException {
if (max == 0) {
return 0;
}
if (buffer.remaining() == 0) {
try {
selector.select();
} catch (ClosedSelectorException e) {
return -1;
}
if (!selector.isOpen()) {
return -1;
}
buffer.clear();
int nread = socket.read(buffer);
buffer.flip();
if (nread < 0) {
return -1;
}
}
int count = Math.min(buffer.remaining(), max);
buffer.get(dest, offset, count);
return count;
}
@Override
public int read(byte[] dest, int offset, int max) throws IOException {
if (max == 0) {
return 0;
}
if (buffer.remaining() == 0) {
try {
selector.select();
} catch (ClosedSelectorException e) {
return -1;
}
if (!selector.isOpen()) {
return -1;
}
buffer.clear();
int nread = socket.read(buffer);
buffer.flip();
if (nread < 0) {
return -1;
}
}
int count = Math.min(buffer.remaining(), max);
buffer.get(dest, offset, count);
return count;
}
protected int doSelect(long timeout) throws IOException {
if (channelArray == null)
throw new ClosedSelectorException();
this.timeout = timeout; // set selector timeout
processDeregisterQueue();
if (interruptTriggered) {
resetWakeupSocket();
return 0;
}
// Calculate number of helper threads needed for poll. If necessary
// threads are created here and start waiting on startLock
adjustThreadsCount();
finishLock.reset(); // reset finishLock
// Wakeup helper threads, waiting on startLock, so they start polling.
// Redundant threads will exit here after wakeup.
startLock.startThreads();
// do polling in the main thread. Main thread is responsible for
// first MAX_SELECTABLE_FDS entries in pollArray.
try {
begin();
try {
subSelector.poll();
} catch (IOException e) {
finishLock.setException(e); // Save this exception
}
// Main thread is out of poll(). Wakeup others and wait for them
if (threads.size() > 0)
finishLock.waitForHelperThreads();
} finally {
end();
}
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
finishLock.checkForException();
processDeregisterQueue();
int updated = updateSelectedKeys();
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
resetWakeupSocket();
return updated;
}
protected void implRegister(SelectionKeyImpl ski) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
growIfNeeded();
channelArray[totalChannels] = ski;
ski.setIndex(totalChannels);
fdMap.put(ski);
keys.add(ski);
pollWrapper.addEntry(totalChannels, ski);
totalChannels++;
}
}
public void putEventOps(SelectionKeyImpl sk, int ops) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
// make sure this sk has not been removed yet
int index = sk.getIndex();
if (index == -1)
throw new CancelledKeyException();
pollWrapper.putEventOps(index, ops);
}
}
protected int doSelect(long timeout) throws IOException {
if (channelArray == null)
throw new ClosedSelectorException();
this.timeout = timeout; // set selector timeout
processDeregisterQueue();
if (interruptTriggered) {
resetWakeupSocket();
return 0;
}
// Calculate number of helper threads needed for poll. If necessary
// threads are created here and start waiting on startLock
adjustThreadsCount();
finishLock.reset(); // reset finishLock
// Wakeup helper threads, waiting on startLock, so they start polling.
// Redundant threads will exit here after wakeup.
startLock.startThreads();
// do polling in the main thread. Main thread is responsible for
// first MAX_SELECTABLE_FDS entries in pollArray.
try {
begin();
try {
subSelector.poll();
} catch (IOException e) {
finishLock.setException(e); // Save this exception
}
// Main thread is out of poll(). Wakeup others and wait for them
if (threads.size() > 0)
finishLock.waitForHelperThreads();
} finally {
end();
}
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
finishLock.checkForException();
processDeregisterQueue();
int updated = updateSelectedKeys();
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
resetWakeupSocket();
return updated;
}
protected void implRegister(SelectionKeyImpl ski) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
growIfNeeded();
channelArray[totalChannels] = ski;
ski.setIndex(totalChannels);
fdMap.put(ski);
keys.add(ski);
pollWrapper.addEntry(totalChannels, ski);
totalChannels++;
}
}
public void putEventOps(SelectionKeyImpl sk, int ops) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
// make sure this sk has not been removed yet
int index = sk.getIndex();
if (index == -1)
throw new CancelledKeyException();
pollWrapper.putEventOps(index, ops);
}
}
protected int doSelect(long timeout) throws IOException {
if (channelArray == null)
throw new ClosedSelectorException();
this.timeout = timeout; // set selector timeout
processDeregisterQueue();
if (interruptTriggered) {
resetWakeupSocket();
return 0;
}
// Calculate number of helper threads needed for poll. If necessary
// threads are created here and start waiting on startLock
adjustThreadsCount();
finishLock.reset(); // reset finishLock
// Wakeup helper threads, waiting on startLock, so they start polling.
// Redundant threads will exit here after wakeup.
startLock.startThreads();
// do polling in the main thread. Main thread is responsible for
// first MAX_SELECTABLE_FDS entries in pollArray.
try {
begin();
try {
subSelector.poll();
} catch (IOException e) {
finishLock.setException(e); // Save this exception
}
// Main thread is out of poll(). Wakeup others and wait for them
if (threads.size() > 0)
finishLock.waitForHelperThreads();
} finally {
end();
}
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
finishLock.checkForException();
processDeregisterQueue();
int updated = updateSelectedKeys();
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
resetWakeupSocket();
return updated;
}
protected void implRegister(SelectionKeyImpl ski) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
growIfNeeded();
channelArray[totalChannels] = ski;
ski.setIndex(totalChannels);
fdMap.put(ski);
keys.add(ski);
pollWrapper.addEntry(totalChannels, ski);
totalChannels++;
}
}
public void putEventOps(SelectionKeyImpl sk, int ops) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
// make sure this sk has not been removed yet
int index = sk.getIndex();
if (index == -1)
throw new CancelledKeyException();
pollWrapper.putEventOps(index, ops);
}
}
protected int doSelect(long timeout) throws IOException {
if (channelArray == null)
throw new ClosedSelectorException();
this.timeout = timeout; // set selector timeout
processDeregisterQueue();
if (interruptTriggered) {
resetWakeupSocket();
return 0;
}
// Calculate number of helper threads needed for poll. If necessary
// threads are created here and start waiting on startLock
adjustThreadsCount();
finishLock.reset(); // reset finishLock
// Wakeup helper threads, waiting on startLock, so they start polling.
// Redundant threads will exit here after wakeup.
startLock.startThreads();
// do polling in the main thread. Main thread is responsible for
// first MAX_SELECTABLE_FDS entries in pollArray.
try {
begin();
try {
subSelector.poll();
} catch (IOException e) {
finishLock.setException(e); // Save this exception
}
// Main thread is out of poll(). Wakeup others and wait for them
if (threads.size() > 0)
finishLock.waitForHelperThreads();
} finally {
end();
}
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
finishLock.checkForException();
processDeregisterQueue();
int updated = updateSelectedKeys();
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
resetWakeupSocket();
return updated;
}
protected void implRegister(SelectionKeyImpl ski) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
growIfNeeded();
channelArray[totalChannels] = ski;
ski.setIndex(totalChannels);
fdMap.put(ski);
keys.add(ski);
pollWrapper.addEntry(totalChannels, ski);
totalChannels++;
}
}
public void putEventOps(SelectionKeyImpl sk, int ops) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
// make sure this sk has not been removed yet
int index = sk.getIndex();
if (index == -1)
throw new CancelledKeyException();
pollWrapper.putEventOps(index, ops);
}
}
public static void main(String[] args) throws Exception {
final Selector sel = Selector.open();
Runnable r = new Runnable() {
public void run() {
try {
sel.select();
} catch (IOException x) {
x.printStackTrace();
} catch (ClosedSelectorException y) {
System.err.println
("Caught expected ClosedSelectorException");
}
}
};
// start thread to block in Selector
Thread t = new Thread(r);
t.start();
// give thread time to start
Thread.sleep(1000);
// interrupt, close, and wakeup is the magic sequence to provoke the NPE
t.interrupt();
sel.close();
sel.wakeup();
}
protected int doSelect(long timeout) throws IOException {
if (channelArray == null)
throw new ClosedSelectorException();
this.timeout = timeout; // set selector timeout
processDeregisterQueue();
if (interruptTriggered) {
resetWakeupSocket();
return 0;
}
// Calculate number of helper threads needed for poll. If necessary
// threads are created here and start waiting on startLock
adjustThreadsCount();
finishLock.reset(); // reset finishLock
// Wakeup helper threads, waiting on startLock, so they start polling.
// Redundant threads will exit here after wakeup.
startLock.startThreads();
// do polling in the main thread. Main thread is responsible for
// first MAX_SELECTABLE_FDS entries in pollArray.
try {
begin();
try {
subSelector.poll();
} catch (IOException e) {
finishLock.setException(e); // Save this exception
}
// Main thread is out of poll(). Wakeup others and wait for them
if (threads.size() > 0)
finishLock.waitForHelperThreads();
} finally {
end();
}
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
finishLock.checkForException();
processDeregisterQueue();
int updated = updateSelectedKeys();
// Done with poll(). Set wakeupSocket to nonsignaled for the next run.
resetWakeupSocket();
return updated;
}
protected void implRegister(SelectionKeyImpl ski) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
growIfNeeded();
channelArray[totalChannels] = ski;
ski.setIndex(totalChannels);
fdMap.put(ski);
keys.add(ski);
pollWrapper.addEntry(totalChannels, ski);
totalChannels++;
}
}
public void putEventOps(SelectionKeyImpl sk, int ops) {
synchronized (closeLock) {
if (pollWrapper == null)
throw new ClosedSelectorException();
// make sure this sk has not been removed yet
int index = sk.getIndex();
if (index == -1)
throw new CancelledKeyException();
pollWrapper.putEventOps(index, ops);
}
}