org.opennms.netmgt.poller.nsclient
Class NsclientManager

java.lang.Object
  org.opennms.netmgt.poller.nsclient.NsclientManager

public class NsclientManager
extends Object

This class is designed to be used by plugins, services and programs to perform checks against an NSClient service.

To use it you must first create an instance of the manager with the host, port and/or password. Then you can set the timeout for the socket, if you want to override DEFAULT_SOCKET_TIMEOUT. Once you have set up the manager, you call the init() method to connect to the service. Once connected you use the processCheckCommand() method to receive a NsclientPacket object containing the response and the result code. Here's an example of using this manager: NsclientCheckParams params = new NsclientCheckParams(critPerc, warnPerc, parameter); NsclientManager client = new NsclientManager(host.getHostAddress(), port); client.init(); NsclientPacket pack=client.processCheckCommand(NsclientManager.convertStringToType(command), params);

Author:

Matt Raykowski, Benjamin Reed, Jeff Gehlbach, OpenNMS

Field Summary

static String	CHECK_CLIENTVERSION The ID for checking the remote client version.
static String	CHECK_COUNTER The ID for checking the value of a remote Perfmon counter.
static String	CHECK_CPULOAD The ID for checking the remote CPU usage.
static String	CHECK_FILEAGE The ID for checking the age of a remote file.
static String	CHECK_FILESIZE The ID for checking the size of a directory.
static String	CHECK_INSTANCES This check type is used by the NSClient developers as a utility for an easy remote method of looking up potential COUNTER instances.
static String	CHECK_MEMUSE The ID for checking the state of the remote memory usage.
static String	CHECK_NONE Default check type.
static String	CHECK_PROCSTATE The ID for checking the state of a remote process.
static String	CHECK_SERVICESTATE The ID for checking the state of a remote service.
static String	CHECK_UPTIME The ID for checking the remote uptime.
static String	CHECK_USEDDISKSPACE The ID for checking the remote used disk space.
static Map<String,String>	CheckStrings Stores the String -> CHECK_ id mappings for lookups.
static int	DEFAULT_PORT The default NSClient TCP port.
static int	DEFAULT_SOCKET_TIMEOUT The default socket timeout.

Constructor Summary

NsclientManager(String host)
Constructor.

NsclientManager(String host, int port)
Constructor.

NsclientManager(String host, int port, String pass)
Constructor.

NsclientManager(String host, String pass)
Constructor.

Method Summary

void	close() Closes the socket.
static String	convertStringToType(String type) This method uses the CheckStrings HashMap to convert from a string to a short value.
static String	convertTypeToString(String type) This method uses CheckStrings to convert from a short value such as CHECK_CLIENTVERSION to the a string, for example "CLIENTVERSION"
String	getHostName() Returns the host name being used to connect to the remote service.
int	getPortNumber() Returns the port being used to connect to the remote service.
int	getTimeout() Returns the TCP socket timeout used when connecting to the remote service.
void	init() This method creates a new socket and attempts to connect to the remote service.
NsclientPacket	processCheckCommand(String type, NsclientCheckParams param) This method determines which check method to call to create a request, send to the server and process the results.
void	setHostName(String host) This method is used to set the host name to connect to for performing remote service checks.
void	setPassword(String pass) This method is used for setting the password used to perform service checks.
void	setPortNumber(int port) This method is used for overriding the port that is used to connect to the remote service.
void	setTimeout(int timeout) This method is used to set the TCP socket timeout to be used when connecting to the remote service.

Methods inherited from class java.lang.Object

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

Field Detail

DEFAULT_SOCKET_TIMEOUT

public static int DEFAULT_SOCKET_TIMEOUT

The default socket timeout.

DEFAULT_PORT

public static int DEFAULT_PORT

The default NSClient TCP port.

CHECK_NONE

public static final String CHECK_NONE

Default check type. Not supported.

See Also:

Constant Field Values

CHECK_CLIENTVERSION

public static final String CHECK_CLIENTVERSION

The ID for checking the remote client version.

See Also:

Constant Field Values

CHECK_CPULOAD

public static final String CHECK_CPULOAD

The ID for checking the remote CPU usage.

See Also:

Constant Field Values

CHECK_UPTIME

public static final String CHECK_UPTIME

The ID for checking the remote uptime.

See Also:

Constant Field Values

CHECK_USEDDISKSPACE

public static final String CHECK_USEDDISKSPACE

The ID for checking the remote used disk space.

See Also:

Constant Field Values

CHECK_SERVICESTATE

public static final String CHECK_SERVICESTATE

The ID for checking the state of a remote service.

See Also:

Constant Field Values

CHECK_PROCSTATE

public static final String CHECK_PROCSTATE

The ID for checking the state of a remote process.

See Also:

Constant Field Values

CHECK_MEMUSE

public static final String CHECK_MEMUSE

The ID for checking the state of the remote memory usage.

See Also:

Constant Field Values

CHECK_COUNTER

public static final String CHECK_COUNTER

The ID for checking the value of a remote Perfmon counter.

See Also:

Constant Field Values

CHECK_FILEAGE

public static final String CHECK_FILEAGE

The ID for checking the age of a remote file.

See Also:

Constant Field Values

CHECK_INSTANCES

public static final String CHECK_INSTANCES

This check type is used by the NSClient developers as a utility for an easy remote method of looking up potential COUNTER instances.

See Also:

Constant Field Values

CHECK_FILESIZE

public static final String CHECK_FILESIZE

The ID for checking the size of a directory. NSClient++ only.

See Also:

Constant Field Values

CheckStrings

public static Map<String,String> CheckStrings

Stores the String -> CHECK_ id mappings for lookups.

Constructor Detail

NsclientManager

public NsclientManager(String host)

Constructor.

Parameters:

host - sets the host name to connect to.

NsclientManager

public NsclientManager(String host,
                       int port)

Constructor. The password defaults to "None"

Parameters:

host - sets the host name to connect to.

port - sets the port number to connect using.

NsclientManager

public NsclientManager(String host,
                       int port,
                       String pass)

Constructor.

Parameters:

host - sets the host name to connect to.

port - sets the port number to connect using.

pass - sets the password to use when performing checks.

NsclientManager

public NsclientManager(String host,
                       String pass)

Constructor. The port number defaults to DEFAULT_PORT.

Parameters:

host - sets the host name to connect to.

pass - sets the password to use when performing checks.

Method Detail

convertTypeToString

public static String convertTypeToString(String type)

This method uses CheckStrings to convert from a short value such as CHECK_CLIENTVERSION to the a string, for example "CLIENTVERSION"

Parameters:

type - the CHECK_ type to look up in the CheckStrings map.

Returns:

a string containing "NONE" if the short is not found in the map, or the string in the map that corresponds to type.

See Also:

CheckStrings, convertStringToType

convertStringToType

public static String convertStringToType(String type)

This method uses the CheckStrings HashMap to convert from a string to a short value. For example if you passed "CLIENTVERSION" you would receive the value of CHECK_CLIENTVERSION in return.

Parameters:

type - A string to look up a CHECK_ value from the CheckStrings HashMap.

Returns:

a short id corresponding to the CHECK_ value that matches the string.

See Also:

CheckStrings, convertTypeToString

setPassword

public void setPassword(String pass)

This method is used for setting the password used to perform service checks.

Parameters:

pass - the password to use when performing service checks.

setPortNumber

public void setPortNumber(int port)

This method is used for overriding the port that is used to connect to the remote service. This method must be called before calling the init() method or it will have no effect.

Parameters:

port - the remote service port.

getPortNumber

public int getPortNumber()

Returns the port being used to connect to the remote service.

Returns:

the port being used to connect to the remote service.

See Also:

init

setHostName

public void setHostName(String host)

This method is used to set the host name to connect to for performing remote service checks. This method must be called before calling the init() method or it will have no effect.

Parameters:

host - the host name to connect to.

See Also:

init

getHostName

public String getHostName()

Returns the host name being used to connect to the remote service.

Returns:

the host name being used to connect to the remote service.

setTimeout

public void setTimeout(int timeout)

This method is used to set the TCP socket timeout to be used when connecting to the remote service. This must be called before calling init or it will have no effect.

Parameters:

timeout - the TCP socket timeout.

getTimeout

public int getTimeout()

Returns the TCP socket timeout used when connecting to the remote service.

Returns:

the tcp socket timeout.

init

public void init()
          throws NsclientException

This method creates a new socket and attempts to connect to the remote service. The input and output streams are created after the socket is connected.

Throws:

NsclientException - if the hostname is unknown if the connection is refused if there is no route to the host if the host did not respond if there was an unexpected IO error. The thrown exception contains the causing exception.

close

public void close()

Closes the socket.

processCheckCommand

public NsclientPacket processCheckCommand(String type,
                                          NsclientCheckParams param)
                                   throws NsclientException

This method determines which check method to call to create a request, send to the server and process the results. It merely determines the method to be called based on the type param.

Parameters:

type - the short ID of the type of check to be processed.

param - the object containing the parameters for performing checks on the respones from the remote service.

Returns:

the NsclientPacket as processed by the check command method that is called.

Throws:

NsclientException - this method rethrows NsclientExceptions caused by the check commands.