public VirtualMachine attach()

in src/main/java/com/jetbrains/jdi/ProcessAttachingConnector.java [94:152]
45 lines of code
10 McCabe index (conditional complexity)

    public VirtualMachine attach(Map<String,? extends Connector.Argument> args)
                throws IOException, IllegalConnectorArgumentsException
    {
        String pid = argument(ARG_PID, args).value();
        String t = argument(ARG_TIMEOUT, args).value();
        int timeout = 0;
        if (t.length() > 0) {
            timeout = Integer.decode(t);
        }

        // Use Attach API to attach to target VM and read value of
        // sun.jdwp.listenAddress property.

        String address;
        com.sun.tools.attach.VirtualMachine vm = null;
        try {
            vm = com.sun.tools.attach.VirtualMachine.attach(pid);
            Properties props = vm.getAgentProperties();
            address = props.getProperty("sun.jdwp.listenerAddress");
        } catch (Exception x) {
            throw new IOException(x);
        } finally {
            if (vm != null) vm.detach();
        }

        // check that the property value is formatted correctly

        if (address == null) {
            throw new IOException("Not a debuggee, or not listening for debugger to attach");
        }
        int pos = address.indexOf(':');
        if (pos < 1) {
            throw new IOException("Unable to determine transport endpoint");
        }

        // parse into transport library name and address

        final String lib = address.substring(0, pos);
        address = address.substring(pos+1);

        TransportService ts = null;
        if (lib.equals("dt_socket")) {
            ts = new SocketTransportService();
        } else {
            if (lib.equals("dt_shmem")) {
                try {
                    ts = SharedMemoryAttachingConnector.createSharedMemoryTransportService();
                } catch (Exception x) { }
            }
        }
        if (ts == null) {
            throw new IOException("Transport " + lib + " not recognized");
        }

        // connect to the debuggee

        Connection connection = ts.attach(address, timeout, 0);
        return VirtualMachineManagerImpl.virtualMachineManager().createVirtualMachine(connection);
    }