How to use

getFunction

method

in

org.apache.asterix.metadata.api.IMetadataManager

private static Function lookupUserDefinedFunctionDecl(MetadataTransactionContext mdTxnCtx,
    FunctionSignature signature) throws AlgebricksException {
  if (signature.getNamespace() == null) {
    return null;
  }
  return MetadataManager.INSTANCE.getFunction(mdTxnCtx, signature);
}

    MetadataManager.INSTANCE.getFunction(metadataProvider.getMetadataTxnContext(), signature);
if (function == null) {
  return null;

protected void handleFunctionDropStatement(MetadataProvider metadataProvider, Statement stmt) throws Exception {
  FunctionDropStatement stmtDropFunction = (FunctionDropStatement) stmt;
  SourceLocation sourceLoc = stmtDropFunction.getSourceLocation();
  FunctionSignature signature = stmtDropFunction.getFunctionSignature();
  signature.setNamespace(getActiveDataverseName(signature.getNamespace()));
  MetadataTransactionContext mdTxnCtx = MetadataManager.INSTANCE.beginTransaction();
  metadataProvider.setMetadataTxnContext(mdTxnCtx);
  MetadataLockUtil.functionStatementBegin(lockManager, metadataProvider.getLocks(), signature.getNamespace(),
      signature.getNamespace() + "." + signature.getName());
  try {
    Function function = MetadataManager.INSTANCE.getFunction(mdTxnCtx, signature);
    // If function == null && stmtDropFunction.getIfExists() == true, commit txn directly.
    if (function == null && !stmtDropFunction.getIfExists()) {
      throw new CompilationException(ErrorCode.UNKNOWN_FUNCTION, sourceLoc, signature);
    } else if (function != null) {
      if (isFunctionUsed(mdTxnCtx, signature, null)) {
        throw new MetadataException(ErrorCode.METADATA_DROP_FUCTION_IN_USE, sourceLoc, signature);
      } else {
        MetadataManager.INSTANCE.dropFunction(mdTxnCtx, signature);
      }
    }
    MetadataManager.INSTANCE.commitTransaction(mdTxnCtx);
  } catch (Exception e) {
    abort(e, e, mdTxnCtx);
    throw e;
  } finally {
    metadataProvider.getLocks().unlock();
  }
}

List<FunctionSignature> appliedFunctions = cfs.getAppliedFunctions();
for (FunctionSignature func : appliedFunctions) {
  if (MetadataManager.INSTANCE.getFunction(mdTxnCtx, func) == null) {
    throw new CompilationException(ErrorCode.FEED_CONNECT_FEED_APPLIED_INVALID_FUNCTION, sourceLoc,
        func.getName());