org.opennms.netmgt.poller.monitors
Class HttpMonitor

java.lang.Object
  org.opennms.netmgt.poller.monitors.AbstractServiceMonitor
      org.opennms.netmgt.poller.monitors.HttpMonitor

All Implemented Interfaces:

ServiceMonitor

Direct Known Subclasses:

HttpsMonitor

@Distributable
public class HttpMonitor
extends AbstractServiceMonitor

This class is designed to be used by the service poller framework to test the availability of the HTTP 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.

Author:

OpenNMS , Tarus Balog , Mike , David Hustace

Field Summary

static String	PARAMETER_BASIC_AUTHENTICATION
static String	PARAMETER_HOST_NAME
static String	PARAMETER_NODE_LABEL_HOST_NAME
static String	PARAMETER_PASSWORD
static String	PARAMETER_PORT
static String	PARAMETER_RESOLVE_IP
static String	PARAMETER_RESPONSE
static String	PARAMETER_RESPONSE_TEXT
static String	PARAMETER_URL
static String	PARAMETER_USER
static String	PARAMETER_USER_AGENT
static String	PARAMETER_VERBOSE

Constructor Summary

HttpMonitor()

Method Summary

protected int[]	determinePorts(Map<String,Object> parameters) determinePorts
PollStatus	poll(MonitoredService svc, Map<String,Object> parameters) This method is the heart of the plug-in monitor.
protected Socket	wrapSocket(Socket socket) wrapSocket

Methods inherited from class org.opennms.netmgt.poller.monitors.AbstractServiceMonitor

initialize, initialize, log, logDown, logDown, logUp, release, release

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

PARAMETER_VERBOSE

public static final String PARAMETER_VERBOSE

See Also:

Constant Field Values

PARAMETER_USER_AGENT

public static final String PARAMETER_USER_AGENT

See Also:

Constant Field Values

PARAMETER_BASIC_AUTHENTICATION

public static final String PARAMETER_BASIC_AUTHENTICATION

See Also:

Constant Field Values

PARAMETER_USER

public static final String PARAMETER_USER

See Also:

Constant Field Values

PARAMETER_PASSWORD

public static final String PARAMETER_PASSWORD

See Also:

Constant Field Values

PARAMETER_RESOLVE_IP

public static final String PARAMETER_RESOLVE_IP

See Also:

Constant Field Values

PARAMETER_NODE_LABEL_HOST_NAME

public static final String PARAMETER_NODE_LABEL_HOST_NAME

See Also:

Constant Field Values

PARAMETER_HOST_NAME

public static final String PARAMETER_HOST_NAME

See Also:

Constant Field Values

PARAMETER_RESPONSE_TEXT

public static final String PARAMETER_RESPONSE_TEXT

See Also:

Constant Field Values

PARAMETER_RESPONSE

public static final String PARAMETER_RESPONSE

See Also:

Constant Field Values

PARAMETER_URL

public static final String PARAMETER_URL

See Also:

Constant Field Values

PARAMETER_PORT

public static final String PARAMETER_PORT

See Also:

Constant Field Values

Constructor Detail

HttpMonitor

public HttpMonitor()

Method Detail

poll

public PollStatus poll(MonitoredService svc,
                       Map<String,Object> parameters)

This method is the heart of the plug-in monitor. Each time an interface requires a check to be performed as defined by the scheduler the poll method is invoked. The poll is passed the interface to check

By default when the status transition from up to down or vice versa the framework will generate an event. Additionally, if the polling interval changes due to an extended unavailability, the framework will generate an additional down event. The plug-in can suppress the generation of the default events by setting the suppress event bit in the returned integer.

Poll the specified address for HTTP service availability. During the poll an attempt is made to connect on the specified port(s) (by default TCP ports 80, 8080, 8888). If the connection request is successful, an HTTP 'GET' command is sent to the interface. The response is parsed and a return code extracted and verified. Provided that the interface's response is valid we set the service status to SERVICE_AVAILABLE and return.

Specified by:

poll in interface ServiceMonitor

Specified by:

poll in class AbstractServiceMonitor

Parameters:

svc - TODO

parameters - The package parameters (timeout, retry, etc...) to be used for this poll.

Returns:

The availability of the interface and if a transition event should be suppressed.

See Also:

PollStatus.SERVICE_AVAILABLE, PollStatus.SERVICE_UNAVAILABLE, PollStatus.SERVICE_AVAILABLE, PollStatus.SERVICE_UNAVAILABLE

wrapSocket

protected Socket wrapSocket(Socket socket)
                     throws IOException

wrapSocket

Parameters:

socket - a Socket object.

Returns:

a Socket object.

Throws:

IOException - if any.

determinePorts

protected int[] determinePorts(Map<String,Object> parameters)

determinePorts

Parameters:

parameters - a Map object.

Returns:

an array of int.