java.lang.Object
org.apache.derby.impl.sql.compile.OptimizerFactoryImpl
- All Implemented Interfaces:
- org.apache.derby.iapi.services.monitor.ModuleControl, org.apache.derby.iapi.sql.compile.OptimizerFactory
- Direct Known Subclasses:
- Level2OptimizerFactoryImpl
- public class OptimizerFactoryImpl
- extends java.lang.Object
- implements org.apache.derby.iapi.services.monitor.ModuleControl, org.apache.derby.iapi.sql.compile.OptimizerFactory
This is simply the factory for creating an optimizer.
|
Method Summary |
void |
boot(boolean create,
java.util.Properties startParams)
Boot this module with the given properties. |
org.apache.derby.iapi.sql.compile.CostEstimate |
getCostEstimate()
Return a new CostEstimate. |
int |
getMaxMemoryPerTable()
Return the maxMemoryPerTable setting, this is used in
optimizer, as well as subquery materialization at run time. |
org.apache.derby.iapi.sql.compile.Optimizer |
getOptimizer(org.apache.derby.iapi.sql.compile.OptimizableList optimizableList,
org.apache.derby.iapi.sql.compile.OptimizablePredicateList predList,
org.apache.derby.iapi.sql.dictionary.DataDictionary dDictionary,
org.apache.derby.iapi.sql.compile.RequiredRowOrdering requiredRowOrdering,
int numTablesInQuery,
org.apache.derby.iapi.sql.conn.LanguageConnectionContext lcc)
Only one optimizer level should exist in the database, however, the
connection may have multiple instances of that optimizer
at a given time. |
protected org.apache.derby.iapi.sql.compile.Optimizer |
getOptimizerImpl(org.apache.derby.iapi.sql.compile.OptimizableList optimizableList,
org.apache.derby.iapi.sql.compile.OptimizablePredicateList predList,
org.apache.derby.iapi.sql.dictionary.DataDictionary dDictionary,
org.apache.derby.iapi.sql.compile.RequiredRowOrdering requiredRowOrdering,
int numTablesInQuery,
org.apache.derby.iapi.sql.conn.LanguageConnectionContext lcc)
|
void |
stop()
Stop the module. |
boolean |
supportsOptimizerTrace()
Return whether or not the optimizer associated with
this factory supports optimizer trace. |
| Methods inherited from class java.lang.Object |
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
optimizerId
protected java.lang.String optimizerId
ruleBasedOptimization
protected boolean ruleBasedOptimization
noTimeout
protected boolean noTimeout
useStatistics
protected boolean useStatistics
maxMemoryPerTable
protected int maxMemoryPerTable
joinStrategySet
protected org.apache.derby.iapi.sql.compile.JoinStrategy[] joinStrategySet
OptimizerFactoryImpl
public OptimizerFactoryImpl()
boot
public void boot(boolean create,
java.util.Properties startParams)
throws org.apache.derby.iapi.error.StandardException
- Description copied from interface:
org.apache.derby.iapi.services.monitor.ModuleControl
- Boot this module with the given properties. Creates a module instance
that can be found using the findModule() methods of Monitor.
The module can only be found using one of these findModule() methods
once this method has returned.
An implementation's boot method can throw StandardException. If it
is thrown the module is not registered by the monitor and therefore cannot
be found through a findModule(). In this case the module's stop() method
is not called, thus throwing this exception must free up any
resources.
When create is true the contents of the properties object
will be written to the service.properties of the persistent
service. Thus any code that requires an entry in service.properties
must explicitly place the value in this properties set
using the put method.
Typically the properties object contains one or more default
properties sets, which are not written out to service.properties.
These default sets are how callers modify the create process. In a
JDBC connection database create the first set of defaults is a properties
object that contains the attributes that were set on the jdbc:derby: URL.
This attributes properties set has the second default properties set as
its default. This set (which could be null) contains the properties
that the user set on their DriverManager.getConnection() call, and are thus
not owned by cloudscape code, and thus must not be modified by cloudscape
code.
When create is false the properties object contains all the properties
set in the service.properties file plus a limited number of
attributes from the JDBC URL attributes or connection properties set.
This avoids properties set by the user compromising the boot process.
An example of a property passed in from the JDBC world is the bootPassword
for encrypted databases.
Code should not hold onto the passed in properties reference after boot time
as its contents may change underneath it. At least after the complete boot
is completed, the links to all the default sets will be removed.
- Specified by:
boot in interface org.apache.derby.iapi.services.monitor.ModuleControl
stop
public void stop()
- Description copied from interface:
org.apache.derby.iapi.services.monitor.ModuleControl
- Stop the module.
The module may be found via a findModule() method until some time after
this method returns. Therefore the factory must be prepared to reject requests
to it once it has been stopped. In addition other modules may cache a reference
to the module and make requests of it after it has been stopped, these requests
should be rejected as well.
- Specified by:
stop in interface org.apache.derby.iapi.services.monitor.ModuleControl
getOptimizer
public org.apache.derby.iapi.sql.compile.Optimizer getOptimizer(org.apache.derby.iapi.sql.compile.OptimizableList optimizableList,
org.apache.derby.iapi.sql.compile.OptimizablePredicateList predList,
org.apache.derby.iapi.sql.dictionary.DataDictionary dDictionary,
org.apache.derby.iapi.sql.compile.RequiredRowOrdering requiredRowOrdering,
int numTablesInQuery,
org.apache.derby.iapi.sql.conn.LanguageConnectionContext lcc)
throws org.apache.derby.iapi.error.StandardException
- Description copied from interface:
org.apache.derby.iapi.sql.compile.OptimizerFactory
- Only one optimizer level should exist in the database, however, the
connection may have multiple instances of that optimizer
at a given time.
- Specified by:
getOptimizer in interface org.apache.derby.iapi.sql.compile.OptimizerFactory
getCostEstimate
public org.apache.derby.iapi.sql.compile.CostEstimate getCostEstimate()
throws org.apache.derby.iapi.error.StandardException
- Description copied from interface:
org.apache.derby.iapi.sql.compile.OptimizerFactory
- Return a new CostEstimate.
- Specified by:
getCostEstimate in interface org.apache.derby.iapi.sql.compile.OptimizerFactory
supportsOptimizerTrace
public boolean supportsOptimizerTrace()
- Description copied from interface:
org.apache.derby.iapi.sql.compile.OptimizerFactory
- Return whether or not the optimizer associated with
this factory supports optimizer trace.
- Specified by:
supportsOptimizerTrace in interface org.apache.derby.iapi.sql.compile.OptimizerFactory
getOptimizerImpl
protected org.apache.derby.iapi.sql.compile.Optimizer getOptimizerImpl(org.apache.derby.iapi.sql.compile.OptimizableList optimizableList,
org.apache.derby.iapi.sql.compile.OptimizablePredicateList predList,
org.apache.derby.iapi.sql.dictionary.DataDictionary dDictionary,
org.apache.derby.iapi.sql.compile.RequiredRowOrdering requiredRowOrdering,
int numTablesInQuery,
org.apache.derby.iapi.sql.conn.LanguageConnectionContext lcc)
throws org.apache.derby.iapi.error.StandardException
getMaxMemoryPerTable
public int getMaxMemoryPerTable()
- Description copied from interface:
org.apache.derby.iapi.sql.compile.OptimizerFactory
- Return the maxMemoryPerTable setting, this is used in
optimizer, as well as subquery materialization at run time.
- Specified by:
getMaxMemoryPerTable in interface org.apache.derby.iapi.sql.compile.OptimizerFactory
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