Class BasicLookupStrategy

  extended by
All Implemented Interfaces:

public final class BasicLookupStrategy
extends Object
implements LookupStrategy

Performs lookups in a manner that is compatible with ANSI SQL.

NB: This implementation does attempt to provide reasonably optimised lookups - within the constraints of a normalised database and standard ANSI SQL features. If you are willing to sacrifice either of these constraints (e.g. use a particular database feature such as hierarchical queries or materalized views, or reduce normalisation) you are likely to achieve better performance. In such situations you will need to provide your own custom LookupStrategy. This class does not support subclassing, as it is likely to change in future releases and therefore subclassing is unsupported.

There are two SQL queries executed, one in the lookupPrimaryKeys method and one in lookupObjectIdentities. These are built from the same select and "order by" clause, using a different where clause in each case. In order to use custom schema or column names, each of these SQL clauses can be customized, but they must be consistent with each other and with the expected result set generated by the the default values.

$Id: 4008 2009-11-25 22:51:53Z ltaylor $
Ben Alex

Field Summary
Constructor Summary
BasicLookupStrategy(DataSource dataSource, AclCache aclCache, AclAuthorizationStrategy aclAuthorizationStrategy, AuditLogger auditLogger)
          Constructor accepting mandatory arguments
Method Summary
 Map<ObjectIdentity,Acl> readAclsById(List<ObjectIdentity> objects, List<Sid> sids)
          The main method.
 void setBatchSize(int batchSize)
 void setLookupObjectIdentitiesWhereClause(String lookupObjectIdentitiesWhereClause)
          The SQL for the where clause used in the lookupObjectIdentities method.
 void setLookupPrimaryKeysWhereClause(String lookupPrimaryKeysWhereClause)
          The SQL for the where clause used in the lookupPrimaryKey method.
 void setOrderByClause(String orderByClause)
          The SQL for the "order by" clause used in both queries.
 void setPermissionFactory(PermissionFactory permissionFactory)
          Sets the PermissionFactory instance which will be used to convert loaded permission data values to Permissions.
 void setSelectClause(String selectClause)
          The SQL for the select clause.
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail


public static final String DEFAULT_SELECT_CLAUSE
See Also:
Constant Field Values


public static final String DEFAULT_ORDER_BY_CLAUSE
See Also:
Constant Field Values
Constructor Detail


public BasicLookupStrategy(DataSource dataSource,
                           AclCache aclCache,
                           AclAuthorizationStrategy aclAuthorizationStrategy,
                           AuditLogger auditLogger)
Constructor accepting mandatory arguments

dataSource - to access the database
aclCache - the cache where fully-loaded elements can be stored
aclAuthorizationStrategy - authorization strategy (required)
Method Detail


public Map<ObjectIdentity,Acl> readAclsById(List<ObjectIdentity> objects,
                                            List<Sid> sids)
The main method.

WARNING: This implementation completely disregards the "sids" argument! Every item in the cache is expected to contain all SIDs. If you have serious performance needs (e.g. a very large number of SIDs per object identity), you'll probably want to develop a custom LookupStrategy implementation instead.

The implementation works in batch sizes specified by batchSize.

Specified by:
readAclsById in interface LookupStrategy
objects - the identities to lookup (required)
sids - the SIDs for which identities are required (ignored by this implementation)
a Map where keys represent the ObjectIdentity of the located Acl and values are the located Acl (never null although some entries may be missing; this method should not throw NotFoundException, as a chain of LookupStrategys may be used to automatically create entries if required)


public void setPermissionFactory(PermissionFactory permissionFactory)
Sets the PermissionFactory instance which will be used to convert loaded permission data values to Permissions. A DefaultPermissionFactory will be used by default.

permissionFactory -


public void setBatchSize(int batchSize)


public void setSelectClause(String selectClause)
The SQL for the select clause. If customizing in order to modify column names, schema etc, the other SQL customization fields must also be set to match.

selectClause - the select clause, which defaults to DEFAULT_SELECT_CLAUSE.


public void setLookupPrimaryKeysWhereClause(String lookupPrimaryKeysWhereClause)
The SQL for the where clause used in the lookupPrimaryKey method.


public void setLookupObjectIdentitiesWhereClause(String lookupObjectIdentitiesWhereClause)
The SQL for the where clause used in the lookupObjectIdentities method.


public void setOrderByClause(String orderByClause)
The SQL for the "order by" clause used in both queries.

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