Add support to update the reported value from getPort() when port is 0

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We have shared continuous integration servers and we want to use subetha smtp 
as mock mail server. IN order to not clash with ports in other projects we use 
port 0 for all our ports in tests so that they JVM will bind to any free port 
and then we pass a reference to the resolver port. For example in Spring I 
would like to be able to do:

    <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
        <property name="host" value="#{mockSMTPServer.server.hostName}" />
        <property name="port" value="#{mockSMTPServer.server.port}" />
    </bean>

    <bean id="mockSMTPServer" class="org.subethamail.wiser.Wiser" init-method="start">
       <property name="port" value="0" />
    </bean>

Unfortunately #{mockSMTPServer.server.port} will report 0 back to me still 
because it doesn't take into account the port the JVM resolved to. This could 
be solved in one of two ways:

1. Expose the ServerSocket via a getter in SMTPServer, then the above config I 
showed would look like:

    <bean id="mailSender" class="org.springframework.mail.javamail.JavaMailSenderImpl">
        <property name="host" value="#{mockSMTPServer.server.hostName}" />
        <property name="port" value="#{mockSMTPServer.server.serverSocket.localPort}" />
    </bean>

    <bean id="mockSMTPServer" class="org.subethamail.wiser.Wiser" init-method="start">
       <property name="port" value="0" />
    </bean>

2. Change the implementation of SMTPServer.createServerSocket to be:

    protected ServerSocket createServerSocket() throws IOException {
        InetSocketAddress isa;

        if (this.bindAddress == null) {
            isa = new InetSocketAddress(this.port);
        } else {
            isa = new InetSocketAddress(this.bindAddress, this.port);
        }

        ServerSocket serverSocket = new ServerSocket();
        // http://java.sun.com/j2se/1.5.0/docs/api/java/net/ServerSocket.html#setReuseAddress(boolean)
        serverSocket.setReuseAddress(true);
        serverSocket.bind(isa, this.backlog);

        if (this.port == 0) {
            this.port = serverSocket.getLocalPort();
        }

        return serverSocket;
    }

Original issue reported on code.google.com by mattgoldspink1@gmail.com on 3 Mar 2011 at 6:27

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I slightly prefer the second solution, because it is similar to the existing 
behavior of ServerSocket (it returns the actual port number, not the 0 
originally specified).

Original comment by hontvari@flyordie.com on 4 Mar 2011 at 10:58

• Changed state: Accepted

[GoogleCodeExporter]

Original comment by hontvari@flyordie.com on 4 Mar 2011 at 10:59

• Added labels: Type-Enhancement
• Removed labels: Type-Defect

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Original comment by hontvari@flyordie.com on 8 Mar 2011 at 1:38

• Changed state: Fixed

[GoogleCodeExporter]

Thanks for the quick turnaround on adding this. Much appreciated

Original comment by mattgoldspink1@gmail.com on 8 Mar 2011 at 6:21