public void push(Program program) throws XATransactionException {
this.evaluator.close();
program.reset(this.getContext().getConnectionId());
program.setTrappingExceptions(
program.getExceptionGroup() != null
|| (!this.programs.isEmpty() && this.programs.peek().isTrappingExceptions()));
TempTableStore tts = getTempTableStore();
getContext().setTempTableStore(program.getTempTableStore());
program.getTempTableStore().setParentTempTableStore(tts);
this.programs.push(program);
VariableContext context = new VariableContext(true);
context.setParentContext(this.currentVarContext);
this.currentVarContext = context;
VariableContext cc = new VariableContext(true);
cc.setParentContext(this.cursorStates);
this.cursorStates = cc;
if (program.isAtomic() && this.blockContext == null) {
TransactionContext tc = this.getContext().getTransactionContext();
if (tc != null && tc.getTransactionType() == Scope.NONE) {
// start a transaction
this.getContext().getTransactionServer().begin(tc);
this.blockContext = tc;
program.setStartedTxn(true);
}
}
}
/**
* Process the procedure, using the stack of Programs supplied by the ProcessorEnvironment. With
* each pass through the loop, the current Program is gotten off the top of the stack, and the
* current instruction is gotten from that program; each call to an instruction's process method
* may alter the Program Stack and/or the current instruction pointer of a Program, so it's
* important that this method's loop refer to the call stack of the ProcessorEnvironment each
* time, and not cache things in local variables. If the current Program's current instruction is
* null, then it's time to pop that Program off the stack.
*
* @return List a single tuple containing one Integer: the update count resulting from the
* procedure execution.
*/
private TupleSource processProcedure()
throws TeiidComponentException, TeiidProcessingException, BlockedException {
// execute plan
ProgramInstruction inst = null;
while (!this.programs.empty()) {
Program program = peek();
inst = program.getCurrentInstruction();
if (inst == null) {
LogManager.logTrace(
org.teiid.logging.LogConstants.CTX_DQP, "Finished program", program); // $NON-NLS-1$
// look ahead to see if we need to process in place
VariableContext vc = this.cursorStates.getParentContext();
CursorState last = (CursorState) this.cursorStates.getValue(null);
if (last != null) {
if (last.resultsBuffer == null && (last.usesLocalTemp || !txnTupleSources.isEmpty())) {
last.resultsBuffer =
bufferMgr.createTupleBuffer(
last.processor.getOutputElements(),
getContext().getConnectionId(),
TupleSourceType.PROCESSOR);
last.returning = true;
}
if (last.returning) {
while (last.ts.hasNext()) {
List<?> tuple = last.ts.nextTuple();
last.resultsBuffer.addTuple(tuple);
}
last.resultsBuffer.close();
last.ts = last.resultsBuffer.createIndexedTupleSource(true);
last.returning = false;
}
}
this.pop(true);
continue;
}
try {
if (inst instanceof RepeatedInstruction) {
LogManager.logTrace(
org.teiid.logging.LogConstants.CTX_DQP,
"Executing repeated instruction",
inst); //$NON-NLS-1$
RepeatedInstruction loop = (RepeatedInstruction) inst;
if (loop.testCondition(this)) {
LogManager.logTrace(
org.teiid.logging.LogConstants.CTX_DQP,
"Passed condition, executing program " + loop.getNestedProgram()); // $NON-NLS-1$
inst.process(this);
this.push(loop.getNestedProgram());
continue;
}
LogManager.logTrace(
org.teiid.logging.LogConstants.CTX_DQP,
"Exiting repeated instruction",
inst); //$NON-NLS-1$
loop.postInstruction(this);
} else {
LogManager.logTrace(
org.teiid.logging.LogConstants.CTX_DQP, "Executing instruction", inst); // $NON-NLS-1$
inst.process(this);
this.evaluator.close();
}
} catch (RuntimeException e) {
throw e;
} catch (TeiidComponentException e) {
throw e;
} catch (Exception e) {
// processing or teiidsqlexception
boolean atomic = program.isAtomic();
while (program.getExceptionGroup() == null) {
this.pop(false);
if (this.programs.empty()) {
// reached the top without a handler, so throw
if (e instanceof TeiidProcessingException) {
throw (TeiidProcessingException) e;
}
throw new ProcedureErrorInstructionException(QueryPlugin.Event.TEIID30167, e);
}
program = peek();
atomic |= program.isAtomic();
}
this.pop(false); // allow the current program to go out of scope
if (atomic) {
TransactionContext tc = this.getContext().getTransactionContext();
if (tc != null && tc.getTransactionType() != Scope.NONE) {
// a non-completing atomic block under a higher level transaction
// this will not work correctly until we support
// checkpoints/subtransactions
try {
tc.getTransaction().setRollbackOnly();
} catch (IllegalStateException e1) {
throw new TeiidComponentException(e1);
} catch (SystemException e1) {
throw new TeiidComponentException(e1);
}
}
}
if (program.getExceptionProgram() == null) {
continue;
}
Program exceptionProgram = program.getExceptionProgram();
this.push(exceptionProgram);
TeiidSQLException tse = TeiidSQLException.create(e);
GroupSymbol gs = new GroupSymbol(program.getExceptionGroup());
this.currentVarContext.setValue(exceptionSymbol(gs, 0), tse.getSQLState());
this.currentVarContext.setValue(exceptionSymbol(gs, 1), tse.getErrorCode());
this.currentVarContext.setValue(exceptionSymbol(gs, 2), tse.getTeiidCode());
this.currentVarContext.setValue(exceptionSymbol(gs, 3), tse);
this.currentVarContext.setValue(exceptionSymbol(gs, 4), tse.getCause());
continue;
}
program.incrementProgramCounter();
}
CursorState last = (CursorState) this.cursorStates.getValue(null);
if (last == null) {
return CollectionTupleSource.createNullTupleSource();
}
return last.ts;
}