org.snmp4j.agent.io
Class DefaultMOPersistenceProvider

java.lang.Object
  org.snmp4j.agent.io.DefaultMOPersistenceProvider

All Implemented Interfaces:

MOPersistenceProvider

public class DefaultMOPersistenceProvider
extends java.lang.Object
implements MOPersistenceProvider

The DefaultMOPersistenceProvider provides agent state persistence using a file with DefaultMOInput and DefaultMOOutput input/output.

Version:

1.2

Author:

Frank Fock

Constructor Summary

DefaultMOPersistenceProvider(MOServer[] server, java.lang.String defaultURI)
Creates a persistence provider for the supplied MOServer instances.

Method Summary

java.lang.String	getDefaultURI() Gets the URI of the default persistent storage for this provider.
java.lang.String	getPersistenceProviderID() Returns an unique ID of the persistence provider which should identify the format and type of the persistence provider.
boolean	isValidPersistenceURI(java.lang.String uri) Checks whether the supplied URI string is valid for this persistence provider.
void	restore(java.lang.String uri, int importMode) Restore (load) agent state from the specified file URI or file name.
void	store(java.lang.String uri) Stores the current agent state to persistent storage specified by the supplied URI.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultMOPersistenceProvider

public DefaultMOPersistenceProvider(MOServer[] server,
                                    java.lang.String defaultURI)

Creates a persistence provider for the supplied MOServer instances. The content and state of the managed objects of those servers are subject to store(java.lang.String) and restore(java.lang.String, int) operations.

Parameters:

server - an array of MOServer instances (possibly empty).

defaultURI - the (optional) default URI (i.e., file path) to be used for this persistence provider.

Method Detail

getPersistenceProviderID

public java.lang.String getPersistenceProviderID()

Returns an unique ID of the persistence provider which should identify the format and type of the persistence provider.

Specified by:

getPersistenceProviderID in interface MOPersistenceProvider

Returns:

"default".

isValidPersistenceURI

public boolean isValidPersistenceURI(java.lang.String uri)

Checks whether the supplied URI string is valid for this persistence provider.

Specified by:

isValidPersistenceURI in interface MOPersistenceProvider

Parameters:

uri - a string identifying a persistent storage location for this storage provider.

Returns:

true if the uri is valid, false otherwise.

restore

public void restore(java.lang.String uri,
                    int importMode)
             throws java.io.IOException

Restore (load) agent state from the specified file URI or file name.

Specified by:

restore in interface MOPersistenceProvider

Parameters:

uri - a string pointing to the persistent storage file from which the agent state should be restored from. The format of he string is either a simple file name or an URI starting with "file:".

importMode - specifies how the agent's current state should be update while restoring a previous state.

Throws:

java.io.IOException - if the restore operation fails.

store

public void store(java.lang.String uri)
           throws java.io.IOException

Stores the current agent state to persistent storage specified by the supplied URI.

Specified by:

store in interface MOPersistenceProvider

Parameters:

uri - a string pointing to the persistent storage file to use. The format of he string is either a simple file name or an URI starting with "file:".

Throws:

java.io.IOException - if the store operation fails.

getDefaultURI

public java.lang.String getDefaultURI()

Description copied from interface: MOPersistenceProvider

Gets the URI of the default persistent storage for this provider.

Specified by:

getDefaultURI in interface MOPersistenceProvider

Returns:

the URI (e.g. file path) for the default persistent storage location of this provider. A provider may use a different one. A null value indicates that there is no default location.