Motivation:
Because we now tie and EventLoop to a Channel from the beginning its possible that we schedule something on it before the registration with the Selector is done. This can lead to AssertionErrors in the current form of the code like:
java.lang.AssertionError
at io.netty.channel.nio.AbstractNioChannel.selectionKey(AbstractNioChannel.java:109)
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.isFlushPending(AbstractNioChannel.java:344)
at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.flush0(AbstractNioChannel.java:332)
at io.netty.channel.AbstractChannel$AbstractUnsafe.flush(AbstractChannel.java:855)
at io.netty.channel.DefaultChannelPipeline$HeadHandler.flush(DefaultChannelPipeline.java:1253)
at io.netty.channel.DefaultChannelHandlerContext.invokeFlush(DefaultChannelHandlerContext.java:747)
at io.netty.channel.DefaultChannelHandlerContext.access$1300(DefaultChannelHandlerContext.java:38)
at io.netty.channel.DefaultChannelHandlerContext$WriteAndFlushTask.write(DefaultChannelHandlerContext.java:1144)
at io.netty.channel.DefaultChannelHandlerContext$AbstractWriteTask.run(DefaultChannelHandlerContext.java:1055)
at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:360)
at io.netty.channel.SingleThreadEventLoop.run(SingleThreadEventLoop.java:200)
at io.netty.util.concurrent.SingleThreadEventExecutor.lambda$doStartThread$4(SingleThreadEventExecutor.java:855)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:75)
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)
Modifications:
Remove assert and add a few null checks.
Result:
No more java.lang.AssertionError.
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