org.opennms.netmgt.dao.api

Class EmptyResourceStorageDao

java.lang.Object

org.opennms.netmgt.dao.api.EmptyResourceStorageDao

All Implemented Interfaces:

ResourceStorageDao

public class EmptyResourceStorageDao
extends Object
implements ResourceStorageDao

Constructor Summary

Constructors

Constructor and Description
EmptyResourceStorageDao()

Method Summary

Modifier and Type	Method and Description
Set<ResourcePath>	children(ResourcePath path, int depth) Retrieves the set of child paths one level bellow the given path which contain one or more metrics at the given depth.
boolean	delete(ResourcePath path) Deletes all of the resources and metric bellow the given path.
boolean	exists(ResourcePath path, int depth) Verifies if a path contains one or more metrics at the given depth.
boolean	existsWithin(ResourcePath path, int depth) Verifies if a path contains one or more metrics within the given depth.
Set<OnmsAttribute>	getAttributes(ResourcePath path) Retrieves the set of (resource-level) attributes stored at the given path.
Map<String,String>	getMetaData(ResourcePath path) Retrieves the meta-data stored at the given path.
String	getStringAttribute(ResourcePath path, String key) Returns the value for the given (resource-level) attribute, or null if it does not exist.
Map<String,String>	getStringAttributes(ResourcePath path) Returns the value for the given (resource-level) attribute, or null if it does not exist.
void	setStringAttribute(ResourcePath path, String key, String value) Sets the specified (resource-level) attribute at the given path.
void	updateMetricToResourceMappings(ResourcePath path, Map<String,String> metricsNameToResourceNames) Maps the given metric names to the their associated resources names.

Methods inherited from class java.lang.Object

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

Constructor Detail

EmptyResourceStorageDao

public EmptyResourceStorageDao()

Method Detail

exists

public boolean exists(ResourcePath path,
                      int depth)

Description copied from interface: ResourceStorageDao

Verifies if a path contains one or more metrics at the given depth.

For example, assume we are working with file-system paths, and we have the following file on disk /a/b/c/some.metric. The function should behave as follows:

• exists('/a/b/c', 0) -> true
• exists('/a/b', 1) -> true
• exists('/a/b', 2) -> false

Specified by:

exists in interface ResourceStorageDao

Parameters:

path - resource path used as the root of the check

depth - a non-negative integer

Returns:

true if one or more metrics exist, false otherwise

existsWithin

public boolean existsWithin(ResourcePath path,
                            int depth)

Description copied from interface: ResourceStorageDao

Verifies if a path contains one or more metrics within the given depth.

For example, assume we are working with file-system paths, and we have the following file on disk /a/b/c/some.metric. The function should behave as follows:

• exists('/a/b/c', 0) -> true
• exists('/a/b', 1) -> true
• exists('/a/b', 2) -> true
• exists('/a', 1) -> false

Specified by:

existsWithin in interface ResourceStorageDao

Parameters:

path - resource path used as the root of the check

depth - a non-negative integer

Returns:

true if one or more metrics exist, false otherwise

children

public Set<ResourcePath> children(ResourcePath path,
                                  int depth)

Description copied from interface: ResourceStorageDao

Retrieves the set of child paths one level bellow the given path which contain one or more metrics at the given depth.

For example, assume we are working with file-system paths, and we have the following file on disk /a/b/c/some.metric. The function should behave as follows:

• children('/a/b', 1) -> {'/a/b/c'}
• children('/a/b', 2) -> {}
• children('/a', 2) -> {'b'}

Specified by:

children in interface ResourceStorageDao

Parameters:

path - resource path used as the root of the check

depth - a positive integer

Returns:

the set of child paths containing metrics

delete

public boolean delete(ResourcePath path)

Description copied from interface: ResourceStorageDao

Deletes all of the resources and metric bellow the given path. Returns true if the operation succeeded.

Specified by:

delete in interface ResourceStorageDao

getAttributes

public Set<OnmsAttribute> getAttributes(ResourcePath path)

Description copied from interface: ResourceStorageDao

Retrieves the set of (resource-level) attributes stored at the given path.

Specified by:

getAttributes in interface ResourceStorageDao

setStringAttribute

public void setStringAttribute(ResourcePath path,
                               String key,
                               String value)

Description copied from interface: ResourceStorageDao

Sets the specified (resource-level) attribute at the given path.

Specified by:

setStringAttribute in interface ResourceStorageDao

getStringAttribute

public String getStringAttribute(ResourcePath path,
                                 String key)

Description copied from interface: ResourceStorageDao

Returns the value for the given (resource-level) attribute, or null if it does not exist.

Specified by:

getStringAttribute in interface ResourceStorageDao

getStringAttributes

public Map<String,String> getStringAttributes(ResourcePath path)

Description copied from interface: ResourceStorageDao

Returns the value for the given (resource-level) attribute, or null if it does not exist.

Specified by:

getStringAttributes in interface ResourceStorageDao

updateMetricToResourceMappings

public void updateMetricToResourceMappings(ResourcePath path,
                                           Map<String,String> metricsNameToResourceNames)

Description copied from interface: ResourceStorageDao

Maps the given metric names to the their associated resources names. The resource names are relative to the given path. When persisting to .rrd of .jrb files with storeByGroup enabled, this is used to map the data sources names (metrics) to associated .rrd files (resource names). Other strategies that can infer this information at runtime may chose to ignore calls to this method.

Specified by:

updateMetricToResourceMappings in interface ResourceStorageDao

Parameters:

path - parent resource path

metricsNameToResourceNames - metric to resource mappings

getMetaData

public Map<String,String> getMetaData(ResourcePath path)

Description copied from interface: ResourceStorageDao

Retrieves the meta-data stored at the given path.

Specified by:

getMetaData in interface ResourceStorageDao