org.springframework.security.acls.jdbc
Class BasicLookupStrategy

java.lang.Object
  org.springframework.security.acls.jdbc.BasicLookupStrategy

All Implemented Interfaces:

LookupStrategy

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.

Version:

$Id: BasicLookupStrategy.java 4008 2009-11-25 22:51:53Z ltaylor $

Author:

Ben Alex

Field Summary

static String	DEFAULT_ORDER_BY_CLAUSE
static String	DEFAULT_SELECT_CLAUSE

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

DEFAULT_SELECT_CLAUSE

public static final String DEFAULT_SELECT_CLAUSE

See Also:

Constant Field Values

DEFAULT_ORDER_BY_CLAUSE

public static final String DEFAULT_ORDER_BY_CLAUSE

See Also:

Constant Field Values

Constructor Detail

BasicLookupStrategy

public BasicLookupStrategy(DataSource dataSource,
                           AclCache aclCache,
                           AclAuthorizationStrategy aclAuthorizationStrategy,
                           AuditLogger auditLogger)

Constructor accepting mandatory arguments

Parameters:

dataSource - to access the database

aclCache - the cache where fully-loaded elements can be stored

aclAuthorizationStrategy - authorization strategy (required)

Method Detail

readAclsById

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

Parameters:

objects - the identities to lookup (required)

sids - the SIDs for which identities are required (ignored by this implementation)

Returns:

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)

setPermissionFactory

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.

Parameters:

permissionFactory -

setBatchSize

public void setBatchSize(int batchSize)

setSelectClause

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.

Parameters:

selectClause - the select clause, which defaults to DEFAULT_SELECT_CLAUSE.

setLookupPrimaryKeysWhereClause

public void setLookupPrimaryKeysWhereClause(String lookupPrimaryKeysWhereClause)

The SQL for the where clause used in the lookupPrimaryKey method.

setLookupObjectIdentitiesWhereClause

public void setLookupObjectIdentitiesWhereClause(String lookupObjectIdentitiesWhereClause)

The SQL for the where clause used in the lookupObjectIdentities method.

setOrderByClause

public void setOrderByClause(String orderByClause)

The SQL for the "order by" clause used in both queries.