public static EventStream GetAuditProxy(String engineURI, String statementName, Attribute[] annotations, FilterSpecCompiled filterSpec, EventStream designated)
{
var audit = AuditEnum.STREAM.GetAudit(annotations);
if (audit == null)
{
return(designated);
}
var writer = new StringWriter();
writer.Write(filterSpec.FilterForEventType.Name);
if (filterSpec.Parameters != null && filterSpec.Parameters.Length > 0)
{
writer.Write('(');
String delimiter = "";
foreach (FilterSpecParam[] paramLine in filterSpec.Parameters)
{
writer.Write(delimiter);
WriteFilter(writer, paramLine);
delimiter = " or ";
}
writer.Write(')');
}
return((EventStream)EventStreamProxy.NewInstance(engineURI, statementName, writer.ToString(), designated));
}
/// <summary>
/// See the method of the same name in <seealso cref="com.espertech.esper.view.stream.StreamFactoryService" />.
/// Always attempts to reuse an existing event stream. May thus return a new event stream or an existing event
/// stream depending on whether filter criteria match.
/// </summary>
/// <param name="statementId">the statement id</param>
/// <param name="filterSpec">is the filter definition</param>
/// <param name="filterService">filter service to activate filter if not already active</param>
/// <param name="epStatementAgentInstanceHandle">is the statement resource lock</param>
/// <param name="isJoin">is indicatng whether the stream will participate in a join statement, information necessary for stream reuse and multithreading concerns</param>
/// <param name="agentInstanceContext"></param>
/// <param name="hasOrderBy">if the consumer has order-by</param>
/// <param name="filterWithSameTypeSubselect">if set to <c>true</c> [filter with same type subselect].</param>
/// <param name="annotations">The annotations.</param>
/// <param name="stateless">if set to <c>true</c> [stateless].</param>
/// <param name="streamNum">The stream num.</param>
/// <param name="isCanIterateUnbound">if set to <c>true</c> [is can iterate unbound].</param>
/// <returns>
/// newly createdStatement event stream, not reusing existing instances
/// </returns>
/// <exception cref="IllegalStateException">Filter spec object already found in collection</exception>
public Pair <EventStream, IReaderWriterLock> CreateStream(
int statementId,
FilterSpecCompiled filterSpec,
FilterService filterService,
EPStatementAgentInstanceHandle epStatementAgentInstanceHandle,
bool isJoin,
AgentInstanceContext agentInstanceContext,
bool hasOrderBy,
bool filterWithSameTypeSubselect,
Attribute[] annotations,
bool stateless,
int streamNum,
bool isCanIterateUnbound)
{
EventStream eventStream;
if (Log.IsDebugEnabled)
{
Log.Debug(".createStream hashCode=" + filterSpec.GetHashCode() + " filter=" + filterSpec);
}
// Check if a stream for this filter already exists
StreamEntry entry;
var forceNewStream = isJoin || (!_isReuseViews) || hasOrderBy || filterWithSameTypeSubselect || stateless;
if (forceNewStream)
{
entry = _eventStreamsIdentity.Get(filterSpec);
}
else
{
entry = _eventStreamsRefCounted[filterSpec];
}
// If pair exists, either reference count or illegal state
if (entry != null)
{
if (forceNewStream)
{
throw new IllegalStateException("Filter spec object already found in collection");
}
else
{
Log.Debug(".createStream filter already found");
_eventStreamsRefCounted.Reference(filterSpec);
// audit proxy
eventStream = EventStreamProxy.GetAuditProxy(
_engineURI, epStatementAgentInstanceHandle.StatementHandle.StatementName, annotations,
filterSpec, entry.EventStream);
// We return the lock of the statement first establishing the stream to use that as the new statement's lock
return(new Pair <EventStream, IReaderWriterLock>(
eventStream, entry.Callback.AgentInstanceHandle.StatementAgentInstanceLock));
}
}
// New event stream
var resultEventType = filterSpec.ResultEventType;
var zeroDepthStream = isCanIterateUnbound
? (EventStream) new ZeroDepthStreamIterable(resultEventType)
: (EventStream) new ZeroDepthStreamNoIterate(resultEventType);
// audit proxy
var inputStream = EventStreamProxy.GetAuditProxy(
_engineURI, epStatementAgentInstanceHandle.StatementHandle.StatementName, annotations, filterSpec,
zeroDepthStream);
eventStream = inputStream;
FilterHandleCallback filterCallback;
if (filterSpec.OptionalPropertyEvaluator != null)
{
filterCallback = new ProxyFilterHandleCallback()
{
ProcStatementId = () => statementId,
ProcMatchFound = (theEvent, allStmtMatches) =>
{
var result = filterSpec.OptionalPropertyEvaluator.GetProperty(theEvent, agentInstanceContext);
if (result != null)
{
eventStream.Insert(result);
}
},
ProcIsSubselect = () => false
};
}
else
{
filterCallback = new ProxyFilterHandleCallback()
{
ProcStatementId = () => statementId,
ProcMatchFound = (theEvent, allStmtMatches) =>
{
if (InstrumentationHelper.ENABLED)
{
InstrumentationHelper.Get().QFilterActivationStream(theEvent.EventType.Name, streamNum);
}
eventStream.Insert(theEvent);
if (InstrumentationHelper.ENABLED)
{
InstrumentationHelper.Get().AFilterActivationStream();
}
},
ProcIsSubselect = () => false
};
}
var handle = new EPStatementHandleCallback(epStatementAgentInstanceHandle, filterCallback);
// Store stream for reuse
entry = new StreamEntry(eventStream, handle);
if (forceNewStream)
{
_eventStreamsIdentity.Put(filterSpec, entry);
}
else
{
_eventStreamsRefCounted[filterSpec] = entry;
}
// Activate filter
var filterValues = filterSpec.GetValueSet(null, agentInstanceContext, null);
var filterServiceEntry = filterService.Add(filterValues, handle);
entry.FilterServiceEntry = filterServiceEntry;
return(new Pair <EventStream, IReaderWriterLock>(inputStream, null));
}
