org.fcrepo.server.storage.lowlevel.akubra
Class AkubraLowlevelStorageModule

java.lang.Object
  org.fcrepo.server.Parameterized
      org.fcrepo.server.Pluggable
          org.fcrepo.server.Module
              org.fcrepo.server.storage.lowlevel.akubra.AkubraLowlevelStorageModule

All Implemented Interfaces:

Constants, IListable, ILowlevelStorage, ISizable

public class AkubraLowlevelStorageModule
extends Module
implements ILowlevelStorage, IListable, ISizable

Wraps a Spring-configured AkubraLowlevelStore instance as a Module.

To use this module, edit $FEDORA_HOME/config/akubra-llstore.xml as appropriate and replace the existing LowlevelStorage module in fedora.fcfg with the following:

 <module role="org.fcrepo.server.storage.lowlevel.ILowlevelStorage"
   class="org.fcrepo.server.storage.lowlevel.akubra.AkubraLowlevelStorageModule"/>
 

Author:

Chris Wilper

Nested Class Summary

Nested classes/interfaces inherited from interface org.fcrepo.common.Constants

Constants.FedoraHome

Field Summary

Fields inherited from interface org.fcrepo.common.Constants

ACCESS, ACTION, API, ATOM_APIM1_0, ATOM_ZIP1_1, ATOM1_1, AUDIT, AUDIT1_0, BATCH_MODIFY, BATCH_MODIFY1_1, BE_SECURITY, BE_SECURITY1_0, BINDING_SPEC, DATASTREAM, DC, DISSEMINATOR, DS_COMPOSITE_MODEL, DS_COMPOSITE_MODEL1_0, DS_INPUT_SPEC1_0, DS_INPUT_SPEC1_1, ENVIRONMENT, FCFG, FEDORA, FEDORA_APP_CONTEXT_NAME, FEDORA_DEFAULT_APP_CONTEXT, FEDORA_HOME, FOXML, FOXML1_0, FOXML1_0_LEGACY, FOXML1_1, HTTP_REQUEST, MANAGEMENT, METHOD_MAP, METS, METS_EXT, METS_EXT1_0, METS_EXT1_0_LEGACY, METS_EXT1_1, MODEL, MULGARA, OAI_DC, OAI_DC2_0, OAI_FRIENDS, OAI_FRIENDS2_0, OAI_IDENTIFIER, OAI_IDENTIFIER2_0, OAI_PMH, OAI_PMH2_0, OAI_PROV, OAI_PROV2_0, OBJ_DATASTREAMS1_0, OBJ_HISTORY1_0, OBJ_ITEMS1_0, OBJ_METHODS1_0, OBJ_PROFILE1_0, OBJ_VALIDATION1_0, OBJECT, OLD_XLINK, PID_LIST1_0, RDF, RDF_XSD, RECOVERY, RELS_EXT, RELS_EXT1_0, RELS_INT1_0, REPO_DESC1_0, RESOURCE, SDEF, SDEF_METHOD_MAP1_0, SDEP, SDEP_METHOD_MAP1_0, SDEP_METHOD_MAP1_1, SERVICE_PROFILE, SOAP, SOAP_ENC, SUBJECT, TYPES, VIEW, WSDL, WSDL_HTTP, WSDL_MIME, XACML_POLICY, XACML_POLICY1_0, XLINK, XML_XSD, XMLNS, XSI

Constructor Summary

AkubraLowlevelStorageModule(Map<String,String> moduleParameters, Server server, String role)

Method Summary

long	addDatastream(String pid, InputStream content) Sets the content of a new datastream version.
void	addObject(String pid, InputStream content) Adds a new object.
void	auditDatastream() Performs a consistency check against the datastream index if such an index exists.
void	auditObject() Performs a consistency check against the object index if such an index exists.
long	getDatastreamSize(String dsKey) Return the size of a datastream in bytes
Iterator<String>	listDatastreams() Lists all stored datastreams in no particular order.
Iterator<String>	listObjects() Lists all stored objects in no particular order.
void	postInitModule() Second stage of Module initialization.
void	rebuildDatastream() Reconstructs the datastream index if such an index exists.
void	rebuildObject() Reconstructs the object index if such an index exists.
void	removeDatastream(String pid) Removes the content of an existing datastream version.
void	removeObject(String pid) Removes an object.
long	replaceDatastream(String pid, InputStream content) Sets the content of an existing datastream version.
void	replaceObject(String pid, InputStream content) Replaces an existing object.
InputStream	retrieveDatastream(String pid) Gets the content of an existing datastream version.
InputStream	retrieveObject(String pid) Gets an existing object.
void	setImpl(ILowlevelStorage store)
void	setLLStoreImpl(ILowlevelStorage impl)

Methods inherited from class org.fcrepo.server.Module

getRole, getServer, initModule, shutdownModule

Methods inherited from class org.fcrepo.server.Pluggable

getHelp, getOptionalParameters, getParameterHelp, getRequiredModuleRoles, getRequiredParameters

Methods inherited from class org.fcrepo.server.Parameterized

getParameter, getParameter, getParameter, getParameterList, getParameters, getParameters, parameterNames, setParameter, setParameters, setParameters

Methods inherited from class java.lang.Object

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

Constructor Detail

AkubraLowlevelStorageModule

public AkubraLowlevelStorageModule(Map<String,String> moduleParameters,
                                   Server server,
                                   String role)
                            throws ModuleInitializationException

Throws:

ModuleInitializationException

Method Detail

setImpl

public void setImpl(ILowlevelStorage store)

setLLStoreImpl

public void setLLStoreImpl(ILowlevelStorage impl)

postInitModule

public void postInitModule()
                    throws ModuleInitializationException

Description copied from class: Module

Second stage of Module initialization. This is guaranteed to run after all Modules' initModule() methods have run.

Overrides:

postInitModule in class Module

Throws:

ModuleInitializationException - If initialization values are invalid or initialization fails for some other reason.

addObject

public void addObject(String pid,
                      InputStream content)
               throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Adds a new object.

Specified by:

addObject in interface ILowlevelStorage

Parameters:

pid - the pid of the object.

content - the serialized object.

Throws:

LowlevelStorageException - if the object already exists or cannot be added for any other reason.

replaceObject

public void replaceObject(String pid,
                          InputStream content)
                   throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Replaces an existing object.

Specified by:

replaceObject in interface ILowlevelStorage

Parameters:

pid - the pid of the object.

content - the serialized object.

Throws:

LowlevelStorageException - if the object does not already exist or cannot be replaced for any other reason.

retrieveObject

public InputStream retrieveObject(String pid)
                           throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Gets an existing object.

Specified by:

retrieveObject in interface ILowlevelStorage

Parameters:

pid - the pid of the object.

Returns:

the serialized form of the object, as stored.

Throws:

LowlevelStorageException - if the object does not exist or cannot be read for any other reason.

removeObject

public void removeObject(String pid)
                  throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Removes an object.

Specified by:

removeObject in interface ILowlevelStorage

Parameters:

pid - the pid of the object.

Throws:

LowlevelStorageException - if the object does not exist or cannot be removed for any other reason.

rebuildObject

public void rebuildObject()
                   throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Reconstructs the object index if such an index exists. The object index associates an object with a stored location. If the implementation does not use an index, this is a no-op.

Warning

Rebuilding the object index is not expected to be an atomic operation and should only be run while the system is offline or reads and writes are otherwise prevented.

Specified by:

rebuildObject in interface ILowlevelStorage

Throws:

LowlevelStorageException - if an error occurs that prevents the index from being rebuilt.

auditObject

public void auditObject()
                 throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Performs a consistency check against the object index if such an index exists. The object index associates an object with a stored location. If the implementation does not use an index, this is a no-op. If any inconsistencies are found, they will be reported to the system logger.

Specified by:

auditObject in interface ILowlevelStorage

Throws:

LowlevelStorageException - if an error occurs that prevents the consistency check from taking place.

addDatastream

public long addDatastream(String pid,
                          InputStream content)
                   throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Sets the content of a new datastream version.

Specified by:

addDatastream in interface ILowlevelStorage

Parameters:

pid - the $pid "+" $dsId "+" $dsVersionId string that uniquely identifies the datastream version.

content - the content.

Throws:

LowlevelStorageException - if the datastream version already exists or cannot be added for any other reason.

replaceDatastream

public long replaceDatastream(String pid,
                              InputStream content)
                       throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Sets the content of an existing datastream version.

Specified by:

replaceDatastream in interface ILowlevelStorage

Parameters:

pid - the $pid "+" $dsId "+" $dsVersionId string that uniquely identifies the datastream version.

content - the content.

Throws:

LowlevelStorageException - if the datastream version does not already exist or cannot be replaced for any other reason.

retrieveDatastream

public InputStream retrieveDatastream(String pid)
                               throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Gets the content of an existing datastream version.

Specified by:

retrieveDatastream in interface ILowlevelStorage

Parameters:

pid - the $pid "+" $dsId "+" $dsVersionId string that uniquely identifies the datastream version.

Returns:

the content.

Throws:

LowlevelStorageException - if the datastream version does not exist or cannot be read for any other reason.

removeDatastream

public void removeDatastream(String pid)
                      throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Removes the content of an existing datastream version.

Specified by:

removeDatastream in interface ILowlevelStorage

Parameters:

pid - the $pid "+" $dsId "+" $dsVersionId string that uniquely identifies the datastream version.

Throws:

LowlevelStorageException - if the datastream version does not exist or cannot be removed for any other reason.

rebuildDatastream

public void rebuildDatastream()
                       throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Reconstructs the datastream index if such an index exists. The datastream index associates a datastream version with a stored location. If the implementation does not use an index, this is a no-op.

Warning

Rebuilding the datastream index is not expected to be an atomic operation and should only be run while the system is offline or reads and writes are otherwise prevented.

Specified by:

rebuildDatastream in interface ILowlevelStorage

Throws:

LowlevelStorageException - if an error occurs that prevents the

auditDatastream

public void auditDatastream()
                     throws LowlevelStorageException

Description copied from interface: ILowlevelStorage

Performs a consistency check against the datastream index if such an index exists. The datastream index associates a datastream version with a stored location. If the implementation does not use an index, this is a no-op. If any inconsistencies are found, they will be reported to the system logger.

Specified by:

auditDatastream in interface ILowlevelStorage

Throws:

LowlevelStorageException - if an error occurs that prevents the consistency check from taking place.

listObjects

public Iterator<String> listObjects()

Description copied from interface: IListable

Lists all stored objects in no particular order.

Specified by:

listObjects in interface IListable

Returns:

an iterator of all stored object pids.

listDatastreams

public Iterator<String> listDatastreams()

Description copied from interface: IListable

Lists all stored datastreams in no particular order.

Specified by:

listDatastreams in interface IListable

Returns:

an iterator of all stored datastream keys, each in the following format: $pid "+" $dsId "+" $dsVersionId

getDatastreamSize

public long getDatastreamSize(String dsKey)
                       throws LowlevelStorageException

Description copied from interface: ISizable

Return the size of a datastream in bytes

Specified by:

getDatastreamSize in interface ISizable

Returns:

Throws:

LowlevelStorageException