com.metamatrix.dqp.service.metadata
Class QueryMetadataCache

java.lang.Object
  com.metamatrix.dqp.service.metadata.QueryMetadataCache

public class QueryMetadataCache
extends java.lang.Object

This caches QueryMetadataInterface implementations for all vdbs, each implementation has access to metadata for a given vdb and the system vdb.

Since:

4.2

Nested Class Summary

protected class

QueryMetadataCache.QueryMetadataInterfaceHolder There a QMI holder per vdb, the holder shields metadata lookups by differrent thereads for differrent vdbs from having to wait for metadata being loaded for a single vdb.

Constructor Summary

QueryMetadataCache(byte[] sysemVdbContent)
Constructor given the contents of a system vdb.

QueryMetadataCache(java.lang.String filePath)
Constructor given the filePath to a system vdb.

QueryMetadataCache(java.net.URL systemVdbUrl)
Constructor givena URL to a system vdb.

Method Summary

void	clearCache() Clears all state on this cache and also deletes any indexfiles associated with the cache.
com.metamatrix.connector.metadata.internal.IObjectSource	getCompositeMetadataObjectSource(java.lang.String vdbName, java.lang.String vdbVersion, VDBService vdbService)
IndexSelector	getCompositeSelector(java.lang.String vdbName, java.lang.String vdbVersion) Get the composite selector fot the given vdbName, version.
boolean	isValid() Check if this query metadata cache is valid, if the cache has been cleared it is no longer valid.
QueryMetadataInterface	lookupMetadata(java.lang.String vdbName, java.lang.String vdbVersion) Look up metadata for the given vdbName, version.
QueryMetadataInterface	lookupMetadata(java.lang.String vdbName, java.lang.String vdbVersion, byte[] vdbContent) Look up metadata for the given vdbName, version at the given filecontent.
QueryMetadataInterface	lookupMetadata(java.lang.String vdbName, java.lang.String vdbVersion, java.io.InputStream vdbContent) Look up metadata for the given vdbName, version at the given filecontent.
void	removeFromCache(java.lang.String vdbName, java.lang.String vdbVersion) Remove cache for a given vdb, called when a vdb is actually deleted.
QueryMetadataInterface	testLoadMetadata(java.lang.String vdbName, java.lang.String vdbVersion, java.lang.String filePath) Only to be used by UnitTests

Methods inherited from class java.lang.Object

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

Constructor Detail

QueryMetadataCache

public QueryMetadataCache(java.net.URL systemVdbUrl)
                   throws MetaMatrixComponentException

Constructor givena URL to a system vdb.

Throws:

MetaMatrixComponentException

Since:

4.2

QueryMetadataCache

public QueryMetadataCache(byte[] sysemVdbContent)
                   throws MetaMatrixComponentException

Constructor given the contents of a system vdb.

Throws:

MetaMatrixComponentException

Since:

4.2

QueryMetadataCache

public QueryMetadataCache(java.lang.String filePath)
                   throws MetaMatrixComponentException

Constructor given the filePath to a system vdb.

Throws:

MetaMatrixComponentException

Since:

4.2

Method Detail

isValid

public boolean isValid()

Check if this query metadata cache is valid, if the cache has been cleared it is no longer valid.

Returns:

Since:

4.3

getCompositeSelector

public IndexSelector getCompositeSelector(java.lang.String vdbName,
                                          java.lang.String vdbVersion)

Get the composite selector fot the given vdbName, version.

getCompositeMetadataObjectSource

public com.metamatrix.connector.metadata.internal.IObjectSource getCompositeMetadataObjectSource(java.lang.String vdbName,
                                                                                                 java.lang.String vdbVersion,
                                                                                                 VDBService vdbService)

lookupMetadata

public QueryMetadataInterface lookupMetadata(java.lang.String vdbName,
                                             java.lang.String vdbVersion)

Look up metadata for the given vdbName, version. This method will return null if no cached QMI could be found.

lookupMetadata

public QueryMetadataInterface lookupMetadata(java.lang.String vdbName,
                                             java.lang.String vdbVersion,
                                             byte[] vdbContent)
                                      throws MetaMatrixComponentException

Look up metadata for the given vdbName, version at the given filecontent.

Throws:

MetaMatrixComponentException

lookupMetadata

public QueryMetadataInterface lookupMetadata(java.lang.String vdbName,
                                             java.lang.String vdbVersion,
                                             java.io.InputStream vdbContent)
                                      throws MetaMatrixComponentException

Look up metadata for the given vdbName, version at the given filecontent.

Throws:

MetaMatrixComponentException

clearCache

public void clearCache()

Clears all state on this cache and also deletes any indexfiles associated with the cache.

Since:

4.2

removeFromCache

public void removeFromCache(java.lang.String vdbName,
                            java.lang.String vdbVersion)

Remove cache for a given vdb, called when a vdb is actually deleted. Also deletes any temp files associated with the vdb.

testLoadMetadata

public QueryMetadataInterface testLoadMetadata(java.lang.String vdbName,
                                               java.lang.String vdbVersion,
                                               java.lang.String filePath)
                                        throws MetaMatrixComponentException

Only to be used by UnitTests

Throws:

MetaMatrixComponentException