static

in openwire-core/src/main/java/org/apache/activemq/openwire/utils/OpenWireIdGenerator.java [44:103]
53 lines of code
12 McCabe index (conditional complexity)

    static {
        String stub = "";
        boolean canAccessSystemProps = true;
        try {
            SecurityManager sm = System.getSecurityManager();
            if (sm != null) {
                sm.checkPropertiesAccess();
            }
        } catch (SecurityException se) {
            canAccessSystemProps = false;
        }

        if (canAccessSystemProps) {
            int idGeneratorPort = 0;
            ServerSocket ss = null;
            try {
                idGeneratorPort = Integer.parseInt(System.getProperty(PROPERTY_IDGENERATOR_PORT, "0"));
                LOG.trace("Using port {}", idGeneratorPort);
                hostName = getLocalHostName();
                ss = new ServerSocket(idGeneratorPort);
                stub = "-" + ss.getLocalPort() + "-" + System.currentTimeMillis() + "-";
                Thread.sleep(100);
            } catch (Exception e) {
                if (LOG.isTraceEnabled()) {
                    LOG.trace("could not generate unique stub by using DNS and binding to local port", e);
                } else {
                    LOG.warn("could not generate unique stub by using DNS and binding to local port: {} {}", e.getClass().getCanonicalName(), e.getMessage());
                }

                // Restore interrupted state so higher level code can deal with
                // it.
                if (e instanceof InterruptedException) {
                    Thread.currentThread().interrupt();
                }
            } finally {
                if (ss != null) {
                    try {
                        ss.close();
                    } catch (IOException ioe) {
                        if (LOG.isTraceEnabled()) {
                            LOG.trace("Closing the server socket failed", ioe);
                        } else {
                            LOG.warn("Closing the server socket failed" + " due " + ioe.getMessage());
                        }
                    }
                }
            }
        }

        if (hostName == null) {
            hostName = "localhost";
        }

        hostName = sanitizeHostName(hostName);

        if (stub.length() == 0) {
            stub = "-1-" + System.currentTimeMillis() + "-";
        }
        UNIQUE_STUB = stub;
    }