jmeierhofer opened a new pull request, #1879:
URL: https://github.com/apache/plc4x/pull/1879
This PR fixes an ordering issue for the user event listeners. The
isConnected method does return false for less than 1ms which causes an
exception because the connection is discared immediately, ignoring that it's
not fully connected yet.
1. MAIN-Thread: `Camel Plc4XEndpoint.setupConnection()`: Connection is
established and waits for the `sessionSetupCompleteFuture` to complete.
2. CHILD-Thread: `S7HMuxImpl.userEventTriggered()` is called and the
`super.userEventTriggered()` method calls all user event listeners
3. CHILD-Thread:
`DefaultNettyPlcConnection.getChannelHandler......userEventTriggered()` is
called, which completes the `sessionSetupCompleteFuture`.
4. MAIN-Thread: Camel `Plc4XEndpoint.setupConnection()` method continues and
checks if `S7HPlcConnection.isConnected()` but the `IS_CONNECTED` was not set
yet and so the connection is closed immediately
5. CHILD-Thread: `S7HMuxImpl.userEventTriggered()` method continues and sets
the `IS_CONNECTED`
By moving the `super.userEventTriggered()` to the end of the method, the
order of the above steps changes to 1, 2, 5, 3, 4 and the bug does not happen.
Log:
```
2024-11-08 10:45:16,107 INFO | main |
o.a.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic | S7 Driver running in
ACTIVE mode.
2024-11-08 10:45:16,108 INFO | main |
org.apache.plc4x.java.s7.readwrite.protocol.S7HMuxImpl | 10:45:16.108880
userEventTriggered: Multiplexor Event:
org.apache.plc4x.java.spi.events.ConnectEvent@6caa4dc5
2024-11-08 10:45:16,112 INFO | ioEventLoopGroup-2-1 |
org.apache.plc4x.java.s7.readwrite.protocol.S7HMuxImpl | Unregistered of
channel: PRIMARY
2024-11-08 10:45:16,112 INFO | ioEventLoopGroup-2-1 |
org.apache.plc4x.java.s7.readwrite.protocol.S7HMuxImpl |
io.netty.channel.embedded.EmbeddedEventLoop@325cf450
2024-11-08 10:45:16,159 WARN | ioEventLoopGroup-3-1 |
io.netty.channel.DefaultChannelPipeline | An exceptionCaught()
event was fired, and it reached at the tail of the pipeline. It usually means
the last handler in the pipeline did not handle the exception.
java.net.SocketException: Connection reset
at
java.base/sun.nio.ch.SocketChannelImpl.throwConnectionReset(SocketChannelImpl.java:401)
at
java.base/sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:434)
at io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java:255)
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1132)
at
io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:356)
at
io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:151)
at
io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
at
io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
at
io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
at
io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.base/java.lang.Thread.run(Thread.java:1583)
2024-11-08 10:45:16,163 INFO | ioEventLoopGroup-3-1 |
org.apache.plc4x.java.s7.readwrite.protocol.S7HMuxImpl | Unregistered of
channel: PRIMARY
2024-11-08 10:45:16,164 INFO | ioEventLoopGroup-3-1 |
org.apache.plc4x.java.s7.readwrite.protocol.S7HMuxImpl | 10:45:16.164222400
userEventTriggered: Multiplexor Event:
org.apache.plc4x.java.spi.events.DisconnectedEvent@1b78b777
2024-11-08 10:45:16,164 INFO | ioEventLoopGroup-3-1 |
org.apache.plc4x.java.s7.readwrite.protocol.S7HMuxImpl |
io.netty.channel.embedded.EmbeddedEventLoop@325cf450
2024-11-08 10:45:16,827 INFO | plc4x-s7ha-thread-1 |
o.a.plc4x.java.s7.readwrite.protocol.S7HPlcConnection | Creating prymary
connection.
2024-11-08 10:45:16,860 INFO | plc4x-s7ha-thread-1 |
org.apache.plc4x.java.transport.tcp.TcpChannelFactory | Configuring Bootstrap
with
org.apache.plc4x.java.s7.readwrite.configuration.S7TcpTransportConfiguration@2d24cdd9
2024-11-08 10:45:16,896 INFO | plc4x-s7ha-thread-1 |
o.a.plc4x.java.s7.readwrite.protocol.S7ProtocolLogic | S7 Driver running in
ACTIVE mode.
```
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