Java Code Examples for java.util.Enumeration#hashCode()

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Example 1
Source File: LinkDiscoveryManager.java    From floodlight_with_topoguard with Apache License 2.0 4 votes vote down vote up 
@LogMessageDoc(level="WARN",
        message="Could not get list of interfaces of local machine to " +
                 "encode in TLV: {detail-msg}",
        explanation="Outgoing LLDP packets encode a unique hash to " +
                 "identify the local machine. The list of network " +
                 "interfaces is used as input and the controller failed " +
                 "to query this list",
        recommendation=LogMessageDoc.REPORT_CONTROLLER_BUG)
protected void setControllerTLV() {
    // Setting the controllerTLVValue based on current nano time,
    // controller's IP address, and the network interface object hash
    // the corresponding IP address.

    final int prime = 7867;

    byte[] controllerTLVValue = new byte[] { 0, 0, 0, 0, 0, 0, 0, 0 }; // 8
                                                                       // byte
                                                                       // value.
    ByteBuffer bb = ByteBuffer.allocate(10);

    long result = System.nanoTime();
    try{
        // Use some data specific to the machine this controller is
        // running on. In this case: the list of network interfaces
        Enumeration<NetworkInterface> ifaces =
                NetworkInterface.getNetworkInterfaces();
        if (ifaces != null) {
            result = result * prime + ifaces.hashCode();
        }
    } catch (SocketException e) {
        log.warn("Could not get list of interfaces of local machine to " +
                 "encode in TLV: {}", e.toString());
    }
    // set the first 4 bits to 0.
    result = result & (0x0fffffffffffffffL);

    bb.putLong(result);

    bb.rewind();
    bb.get(controllerTLVValue, 0, 8);

    this.controllerTLV = new LLDPTLV().setType((byte) 0x0c)
                                      .setLength((short) controllerTLVValue.length)
                                      .setValue(controllerTLVValue);
}