Examples of org.apache.derby.iapi.services.context.ContextManager

Package org.apache.derby.iapi.services.context

Examples of org.apache.derby.iapi.services.context.ContextManager

org.apache.derby.iapi.services.context.ContextManager
The ContextManager collects contexts as they are created. It maintains stacks of contexts by named ids, so that the top context of a given type can be returned. It also maintains a global stack so that contexts can be traversed in the order they were created.
The first implementation of the context manager assumes there is only one thread to worry about and that the user(s) of the class only create one instance of ContextManager.


        public void run() {


            // The thread needs a ContextManager since two threads
            // cannot share a context
            ContextManager bootThreadCm = null;
            try {


                bootThreadCm = ContextService.getFactory().newContextManager();
                ContextService.getFactory().
                    setCurrentContextManager(bootThreadCm);

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            // error we get at this point is going to shut down the db.


            while (true)
            {
                // allocate new context and associate new xact with it.
                ContextManager cm      = contextFactory.newContextManager();
                contextFactory.setCurrentContextManager(cm);


        try {
                RawTransaction rawtran = 
                    startTransaction(

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    if (fid == null)
      throw StandardException.newException(SQLState.LANG_FILE_DOES_NOT_EXIST, sqlName,schemaName);


    long generationId = fid.getGenerationId();


        ContextManager cm = ContextService.getFactory().getCurrentContextManager();
    FileResource fr = af.getTransaction(cm).getFileHandler();


    String externalName = JarUtil.mkExternalName(schemaName, sqlName, fr.getSeparatorChar());


    return fr.getAsFile(externalName, generationId);

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        XAXactId xid_im = new XAXactId(xid);
        XATransactionState tranState = getTransactionState(xid_im);
        
        if (tranState == null) {
            XAResourceManager rm = ra.getXAResourceManager();
            ContextManager inDoubtCM = rm.find(xid);
            // RM also does not know about this xid.
            if (inDoubtCM == null)
                throw new XAException(XAException.XAER_NOTA);
            ContextService csf = ContextService.getFactory();
            csf.setCurrentContextManager(inDoubtCM);
            try {
                rm.commit(inDoubtCM, xid_im, onePhase);
                
                // close the connection/transaction since it can never
                // be used again.
                inDoubtCM.cleanupOnError(StandardException.closeException());
                return;
            } catch (StandardException se) {
                // The rm threw an exception, clean it up in the approprate
                // context.  There is no transactionResource to handle the
                // exception for us.
                inDoubtCM.cleanupOnError(se);
                throw wrapInXAException(se);
            } finally {
                csf.resetCurrentContextManager(inDoubtCM);
            }

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        XATransactionState tranState = getTransactionState(xid_im);
        
        if (tranState == null) {
            XAResourceManager rm = ra.getXAResourceManager();
            
            ContextManager inDoubtCM = rm.find(xid);
            
            // RM also does not know about this xid.
            if (inDoubtCM == null)
                throw new XAException(XAException.XAER_NOTA);

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        XATransactionState tranState = getTransactionState(xid_im);
        if (tranState == null) {
            XAResourceManager rm = ra.getXAResourceManager();
            
            ContextManager inDoubtCM = rm.find(xid);
            
            // RM also does not know about this xid.
            if (inDoubtCM == null)
                throw new XAException(XAException.XAER_NOTA);
            
            ContextService csf = ContextService.getFactory();
            
            csf.setCurrentContextManager(inDoubtCM);
            try {
                rm.forget(inDoubtCM, xid_im);
                
                // close the connection/transaction since it can never be used again.
                inDoubtCM.cleanupOnError(StandardException.closeException());
                return;
            } catch (StandardException se) {
                // The rm threw an exception, clean it up in the approprate
                // context.  There is no transactionResource to handle the
                // exception for us.
                inDoubtCM.cleanupOnError(se);
                throw wrapInXAException(se);
            } finally {
                csf.resetCurrentContextManager(inDoubtCM);
            }

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        XATransactionState tranState = getTransactionState(xid_im);
        
        if (tranState == null) {
            XAResourceManager rm = ra.getXAResourceManager();
            
            ContextManager inDoubtCM = rm.find(xid);
            
            // RM also does not know about this xid.
            if (inDoubtCM == null)
                throw new XAException(XAException.XAER_NOTA);
            
            ContextService csf = ContextService.getFactory();
            
            csf.setCurrentContextManager(inDoubtCM);
            try {
                rm.rollback(inDoubtCM, xid_im);
                
                // close the connection/transaction since it can never be used again.
                inDoubtCM.cleanupOnError(StandardException.closeException());
                return;
            } catch (StandardException se) {
                // The rm threw an exception, clean it up in the approprate
                // context.  There is no transactionResource to handle the
                // exception for us.
                inDoubtCM.cleanupOnError(se);
                throw wrapInXAException(se);
            } finally {
                csf.resetCurrentContextManager(inDoubtCM);
            }

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     **/
    public TransactionManager getInternalTransaction()
        throws StandardException
    {
        // Get the context manager.
        ContextManager cm = getContextManager();


        // Allocate a new transaction no matter what.
        
        // Create a transaction, make a context for it, and push the context.
        // Note this puts the raw store transaction context

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     **/
    public TransactionController startNestedUserTransaction(boolean readOnly)
        throws StandardException
    {
        // Get the context manager.
        ContextManager cm = getContextManager();


        // Allocate a new transaction no matter what.
        
        // Create a transaction, make a context for it, and push the context.
        // Note this puts the raw store transaction context

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    /*
    ** The current connection is the one in the current
    ** connection context, so get the context.
    */
    ContextManager  cm = getCurrentContextManager();


    ConnectionContext localCC = null;


    /*
      cm is null the very first time, and whenever
      we aren't actually nested.
     */
    if (cm != null) {
      localCC = (ConnectionContext)
        (cm.getContext(ConnectionContext.CONTEXT_ID));
    }


    return localCC;
  }

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