public void Validate(string id, string epl)
{
// id can be empty or null for validation call
InternalValidate(epl);
try
{
// check if the input contains any our delimiters
// such as [DO NOT FIRE ALERT BLOCK START] ... [DO NOT FIRE ALERT BLOCK STOP]
var parser = new EplParser();
bool shouldParse = parser.HasSubscriptionMarkers(epl);
// Check if a block is present
if (shouldParse) // yes
{
EplParsedTuple tuple = parser.Parse(epl);
// Compile stage 1
// Read block of statements that doesn't require alert subscriber into module
Module module = _engine.EPAdministrator.DeploymentAdmin.Parse(tuple.EplScript);
// iterate through each epl separated by a semicolon ";"
foreach (var item in module.Items)
{
_engine.EPAdministrator.CompileEPL(item.Expression);
}
// Compile stage 2
_engine.EPAdministrator.CompileEPL(tuple.StatementToFireAlert);
}
else // no parsing needed, just compile whatever we have
{
_engine.EPAdministrator.CompileEPL(epl);
}
}
catch (Exception ex)
{
string newMessage = string.Concat("Rule ", id, " is invalid");
throw new ArgumentException(newMessage, ex);
}
}
private EPStatement InsertEplStatementIntoNesper(string id, string epl)
{
_log.Info($"Epl: {epl}");
InternalValidate();
// check if the input contains any our delimiters
// such as [DO NOT FIRE ALERT BLOCK START] ... [DO NOT FIRE ALERT BLOCK STOP]
var parser = new EplParser();
bool shouldParse = parser.HasSubscriptionMarkers(epl);
EPStatement epStatement = null;
// Check if a block is present
if (shouldParse) // yes
{
_log.Info("Scripting block found");
// read the two parts
// first should just be imported into NEsper
// without adding any subscriber
// second part should contain a single epl that
// will fire an alert
EplParsedTuple tuple = parser.Parse(epl);
var md5 = new Md5();
string hash = md5.GetHashAsHex(tuple.EplScript);
var kvp = LoadedModules.FirstOrDefault(x => x.Value.Checksum == hash);
bool isNewModule = kvp.Value == null;
if (isNewModule)
{
_log.Info("Creating module from script");
var result = _engine.EPAdministrator.DeploymentAdmin.ParseDeploy(tuple.EplScript);
var mi = new NesperModuleItem
{
Id = result.DeploymentId,
UseCount = 1,
Checksum = hash
};
_log.Info($"Scripting block contained {result.Statements.Count} statements");
LoadedModules.Add(id, mi);
}
else
{
kvp.Value.UseCount++;
}
// create epl that will be linked with a subscriber
_log.Info("Creating statement that fires alert");
if (!string.IsNullOrWhiteSpace(tuple.StatementToFireAlert)) //we can now potentially have some statements which don't actually need to be attached.
{
epStatement = _engine.EPAdministrator.CreateEPL(tuple.StatementToFireAlert, id);
}
}
else
{
_log.Info("Creating statement that fires alert");
epStatement = _engine.EPAdministrator.CreateEPL(epl, id);
_log.Info("Created id: " + epStatement.Name);
}
return(epStatement);
}
