Java Doc for ContextService.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » iapi » services » context » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.iapi.services.context   Source Cross Reference   Class Diagram   Java Document (Java Doc)   java.lang.Object    org.apache.derby.iapi.services.context.ContextService ContextService final public class ContextService (Code) A set of static methods to supply easier access to contexts. Constructor Summary public   ContextService()      Create a new ContextService for a Derby system. Method Summary public static  Context getContext(String contextId)      Find the context with the given name in the context service factory loaded for the system. public static  Context getContextOrNull(String contextId)      Find the context with the given name in the context service factory loaded for the system. public  ContextManager getCurrentContextManager()      Get current Context Manager linked to the current Thread. public static  ContextService getFactory()      public  ContextManager newContextManager()      It's up to the caller to track this context manager and set it in the context manager list using setCurrentContextManager. public  void notifyAllActiveThreads(Context c)      synchronized  void removeContext(ContextManager cm)      Remove a ContextManager from the list of all active contexts managers. public  void resetCurrentContextManager(ContextManager cm)      Break the link between the current Thread and the passed in ContextManager. public  void setCurrentContextManager(ContextManager cm)      Link the current thread to the passed in Contextmanager so that a subsequent call to getCurrentContextManager by the current Thread will return cm. ContextManagers are tied to a Thread while the thread is executing Derby code. public static  void stop()      So it can be given to us and taken away... Constructor Detail ContextService public ContextService()(Code) Create a new ContextService for a Derby system. Only a single system is active at any time. Method Detail getContext public static Context getContext(String contextId)(Code) Find the context with the given name in the context service factory loaded for the system. The requested context, null if it doesn't exist. getContextOrNull public static Context getContextOrNull(String contextId)(Code) Find the context with the given name in the context service factory loaded for the system. This version will not do any debug checking, but return null quietly if it runs into any problems. The requested context, null if it doesn't exist. getCurrentContextManager public ContextManager getCurrentContextManager()(Code) Get current Context Manager linked to the current Thread. See setCurrentContextManager for details. Note that this call can be expensive and is only intended to be used in "stateless" situations. Ideally code has a reference to the correct ContextManager from another Object, such as a pushed Context. ContextManager current Context Manager getFactory public static ContextService getFactory()(Code) newContextManager public ContextManager newContextManager()(Code) It's up to the caller to track this context manager and set it in the context manager list using setCurrentContextManager. We don't keep track of it due to this call being made. notifyAllActiveThreads public void notifyAllActiveThreads(Context c)(Code) removeContext synchronized void removeContext(ContextManager cm)(Code) Remove a ContextManager from the list of all active contexts managers. resetCurrentContextManager public void resetCurrentContextManager(ContextManager cm)(Code) Break the link between the current Thread and the passed in ContextManager. Called in a pair with setCurrentContextManager, see that method for details. setCurrentContextManager public void setCurrentContextManager(ContextManager cm)(Code) Link the current thread to the passed in Contextmanager so that a subsequent call to getCurrentContextManager by the current Thread will return cm. ContextManagers are tied to a Thread while the thread is executing Derby code. For example on most JDBC method calls the ContextManager backing the Connection object is tied to the current Thread at the start of the method and reset at the end of the method. Once the Thread has completed its Derby work the method resetCurrentContextManager must be called with the same ContextManager to break the link. Note that a subsquent use of the ContextManager may be on a separate Thread, the Thread is only linked to the ContextManager between the setCurrentContextManager and resetCurrentContextManager calls. ContextService supports nesting of calls by a single Thread, either with the same ContextManager or a different ContextManager. The same ContextManager would be pushed during a nested JDBC call in a procedure or function. A different ContextManager would be pushed during a call on a different embedded JDBC Connection in a procedure or function. stop public static void stop()(Code) So it can be given to us and taken away... Methods inherited from java.lang.Object native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc) public boolean equals(Object obj)(Code)(Java Doc) protected void finalize() throws Throwable(Code)(Java Doc) final native public Class getClass()(Code)(Java Doc) native public int hashCode()(Code)(Java Doc) final native public void notify()(Code)(Java Doc) final native public void notifyAll()(Code)(Java Doc) public String toString()(Code)(Java Doc) final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc) final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc) final public void wait() throws InterruptedException(Code)(Java Doc)