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java.lang.Objectorg.opennms.netmgt.poller.monitors.IPv4LatencyMonitor
org.opennms.netmgt.poller.monitors.DnsMonitor
This class is designed to be used by the service poller framework to test the availability of the DNS service on remote interfaces. The class implements the ServiceMonitor interface that allows it to be used along with other plug-ins by the service poller framework.
Field Summary | |
private static int |
DEFAULT_PORT
Default DNS port. |
private static int |
DEFAULT_RETRY
Default retries. |
private static int |
DEFAULT_TIMEOUT
Default timeout. |
Fields inherited from class org.opennms.netmgt.poller.monitors.IPv4LatencyMonitor |
DS_NAME |
Fields inherited from interface org.opennms.netmgt.poller.monitors.ServiceMonitor |
SERVICE_AVAILABLE, SERVICE_STATUS_MASK, SERVICE_UNAVAILABLE, SERVICE_UNKNOWN, SERVICE_UNRESPONSIVE, SURPRESS_EVENT_MASK |
Constructor Summary | |
DnsMonitor()
|
Method Summary | |
int |
poll(NetworkInterface iface,
java.util.Map parameters,
Package pkg)
Poll the specified address for DNS service availability. |
Methods inherited from class org.opennms.netmgt.poller.monitors.IPv4LatencyMonitor |
createRRD, initialize, initialize, release, release, updateRRD |
Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Field Detail |
private static final int DEFAULT_PORT
private static final int DEFAULT_RETRY
private static final int DEFAULT_TIMEOUT
Constructor Detail |
public DnsMonitor()
Method Detail |
public int poll(NetworkInterface iface, java.util.Map parameters, Package pkg)
Poll the specified address for DNS service availability.
During the poll an DNS address request query packet is generated for hostname 'localhost'. The query is sent via UDP socket to the interface at the specified port (by default UDP port 53). If a response is received, it is parsed and validated. If the DNS lookup was successful the service status is set to SERVICE_AVAILABLE and the method returns.
iface
- The network interface to test the service on.parameters
- The package parameters (timeout, retry, etc...) to be used for
this poll.
ServiceMonitor.SURPRESS_EVENT_MASK
,
ServiceMonitor.SERVICE_AVAILABLE
,
ServiceMonitor.SERVICE_UNAVAILABLE
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