public void invokeOnewayImpl( final Channel channel, final RemotingCommand request, final long timeoutMillis) throws InterruptedException, RemotingTooMuchRequestException, RemotingTimeoutException, RemotingSendRequestException { request.markOnewayRPC(); boolean acquired = this.semaphoreOneway.tryAcquire(timeoutMillis, TimeUnit.MILLISECONDS); if (acquired) { final SemaphoreReleaseOnlyOnce once = new SemaphoreReleaseOnlyOnce(this.semaphoreOneway); try { channel .writeAndFlush(request) .addListener( new ChannelFutureListener() { @Override public void operationComplete(ChannelFuture f) throws Exception { once.release(); if (!f.isSuccess()) { plog.warn( "send a request command to channel <" + channel.remoteAddress() + "> failed."); plog.warn(request.toString()); } } }); } catch (Exception e) { once.release(); plog.warn( "write send a request command to channel <" + channel.remoteAddress() + "> failed."); throw new RemotingSendRequestException(RemotingHelper.parseChannelRemoteAddr(channel), e); } } else { if (timeoutMillis <= 0) { throw new RemotingTooMuchRequestException("invokeOnewayImpl invoke too fast"); } else { String info = String.format( "invokeOnewayImpl tryAcquire semaphore timeout, %dms, waiting thread nums: %d semaphoreAsyncValue: %d", // timeoutMillis, // this.semaphoreAsync.getQueueLength(), // this.semaphoreAsync.availablePermits() // ); plog.warn(info); plog.warn(request.toString()); throw new RemotingTimeoutException(info); } } }