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POJava trouble with SocketChannel connections
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5124934
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5131639
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1
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2011-02-26T03:54:25.523
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2011-02-27T05:31:54.810
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2011-02-26T03:58:26.147
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This is a class assignment, so I need hints more than answers. I have a process running on four virtual linux machines. Each process communicates with two of its neighbors. Each process uses <pre><code>server = ServerSocketChannel.open() server.configureBlocking(false) server.socket().bind(new InetSocketAddress(port)) server.register(selector, SelectionKey.OP_ACCEPT) </code></pre> At startup, process A doesn't try to connect to anyone. Process B does <pre><code>SocketChannel SC = SocketChannel.open() SC.configureBlocking( false ) SC.connect(new INetSocketAddress( A-machine, A-port ) SC.register( selector, SC.validOps()) </code></pre> Process C does the same with B; and D with C. Next, I call selector.select and iterate through any selectedKeys. When I see key.isValid() && key.isAcceptable() both true, I think a socket is attempting to connect to me and I call <pre><code>SocketChannel client = server.accept() client.configureBlocking(false) client.register(selector, client.validOps() ) </code></pre> When I see key.isValid() && key.isConnectable() both true, I think a server is available for me to connect to. I call <pre><code>SocketChannel connectingChannel = (SocketChannel)key.channel() connectingChannel.finishConnect() </code></pre> When I see key.isValid() && key.isReadable(), I read in a message I have received. This process works AS LONG AS I START THE PROCESSES IN ORDER: A, B, C, D. If I only start B, it fails on the finishConnect statement. I read the docs where isConnectable tests whether this key's channel has either finished, or failed to finish, its socket-connection operation. How can isConnectable be true and I get a failure on finishConnect?
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<java><socketchannel>
Title
Java trouble with SocketChannel connections
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1. USKelly Cline
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