Class OptimizerFactoryImpl

    • Field Detail

      • optimizerId

        protected java.lang.String optimizerId
      • ruleBasedOptimization

        protected boolean ruleBasedOptimization
      • noTimeout

        protected boolean noTimeout
      • useStatistics

        protected boolean useStatistics
      • maxMemoryPerTable

        protected int maxMemoryPerTable
      • joinOrderOptimization

        private boolean joinOrderOptimization
    • Constructor Detail

      • OptimizerFactoryImpl

        public OptimizerFactoryImpl()
    • Method Detail

      • boot

        public void boot​(boolean create,
                         java.util.Properties startParams)
                  throws StandardException
        Description copied from interface: 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 Derby code, and thus must not be modified by Derby 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 ModuleControl
        Throws:
        StandardException - Module cannot be started.
        See Also:
        Monitor, ModuleFactory
      • stop

        public void stop()
        Description copied from interface: 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 ModuleControl
        See Also:
        Monitor, ModuleFactory
      • doJoinOrderOptimization

        public boolean doJoinOrderOptimization()
        Description copied from interface: OptimizerFactory
        Tell whether to do join order optimization.
        Specified by:
        doJoinOrderOptimization in interface OptimizerFactory
        Returns:
        true means do join order optimization, false means don't do it.