private void addWriteTimeoutTask(WriteTimeoutTask task) {
if (lastTask == null) {
lastTask = task;
} else {
lastTask.next = task;
task.prev = lastTask;
lastTask = task;
}
}
private void scheduleTimeout(final ChannelHandlerContext ctx, final ChannelPromise promise) {
// Schedule a timeout.
final WriteTimeoutTask task = new WriteTimeoutTask(ctx, promise);
task.scheduledFuture = ctx.executor().schedule(task, timeoutNanos, TimeUnit.NANOSECONDS);
if (!task.scheduledFuture.isDone()) {
addWriteTimeoutTask(task);
// Cancel the scheduled timeout if the flush promise is complete.
promise.addListener(task);
}
}
@Override
public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {
WriteTimeoutTask task = lastTask;
lastTask = null;
while (task != null) {
task.scheduledFuture.cancel(false);
WriteTimeoutTask prev = task.prev;
task.prev = null;
task.next = null;
task = prev;
}
}
private void removeWriteTimeoutTask(WriteTimeoutTask task) {
if (task == lastTask) {
// task is the tail of list
assert task.next == null;
lastTask = lastTask.prev;
if (lastTask != null) {
lastTask.next = null;
}
} else if (task.prev == null && task.next == null) {
// Since task is not lastTask, then it has been removed or not been added.
return;
} else if (task.prev == null) {
// task is the head of list and the list has at least 2 nodes
task.next.prev = null;
} else {
task.prev.next = task.next;
task.next.prev = task.prev;
}
task.prev = null;
task.next = null;
}