#### [Abblix\.SharedSignals](https://www.abblix.com/en/docs/api/abblix-sharedsignals 'index')
### [Abblix\.SharedSignals\.Transmitter](https://www.abblix.com/en/docs/api/abblix-sharedsignals/Abblix.SharedSignals.Transmitter 'Abblix\.SharedSignals\.Transmitter')

## SubjectMatcher Class

The subject matching of SSF 1\.0 Section 8\.1\.3\.1: the rule by which a transmitter decides
whether an event's subject falls under a subject the receiver added to its stream\. Simple
subjects match when exactly identical; complex subjects match when EVERY field is undefined
on either side or identical on both \- which is what makes an absent field a wildcard, so a
receiver adding just a tenant hears about every user of that tenant, and one adding user
plus device still hears an event that names only the user\.

```csharp
public static class SubjectMatcher
```

Inheritance [System\.Object](https://learn.microsoft.com/en-us/dotnet/api/system.object 'System\.Object') → SubjectMatcher
### Methods

## SubjectMatcher\.Identical\(SubjectIdentifier, SubjectIdentifier\) Method {#Abblix.SharedSignals.Transmitter.SubjectMatcher.Identical(Abblix.SecurityEvents.Subjects.SubjectIdentifier,Abblix.SecurityEvents.Subjects.SubjectIdentifier)}

"Exactly identical" \(SSF 1\.0 Section 8\.1\.3\.1\), taken at the wire level: two subjects are
identical when they serialize to equal JSON\. The serialized form is what both parties
actually exchanged, and each subtype writes its members in one fixed order, so the
comparison is deterministic without a per\-format equality to maintain\. Public beside
[Matches\(SubjectIdentifier, SubjectIdentifier\)](https://www.abblix.com/en/docs/api/abblix-sharedsignals/Abblix.SharedSignals.Transmitter.SubjectMatcher#Abblix.SharedSignals.Transmitter.SubjectMatcher.Matches(Abblix.SecurityEvents.Subjects.SubjectIdentifier,Abblix.SecurityEvents.Subjects.SubjectIdentifier) 'Abblix\.SharedSignals\.Transmitter\.SubjectMatcher\.Matches\(Abblix\.SecurityEvents\.Subjects\.SubjectIdentifier, Abblix\.SecurityEvents\.Subjects\.SubjectIdentifier\)') because subject BOOKKEEPING wants the strict relation: a removal
undoes exactly what was added, where the wildcard matching would over\-reach\.

```csharp
public static bool Identical(Abblix.SecurityEvents.Subjects.SubjectIdentifier first, Abblix.SecurityEvents.Subjects.SubjectIdentifier second);
```
#### Parameters

###### `first` [Abblix\.SecurityEvents\.Subjects\.SubjectIdentifier](https://learn.microsoft.com/en-us/dotnet/api/abblix.securityevents.subjects.subjectidentifier 'Abblix\.SecurityEvents\.Subjects\.SubjectIdentifier') {#Abblix.SharedSignals.Transmitter.SubjectMatcher.Identical(Abblix.SecurityEvents.Subjects.SubjectIdentifier,Abblix.SecurityEvents.Subjects.SubjectIdentifier).first}

###### `second` [Abblix\.SecurityEvents\.Subjects\.SubjectIdentifier](https://learn.microsoft.com/en-us/dotnet/api/abblix.securityevents.subjects.subjectidentifier 'Abblix\.SecurityEvents\.Subjects\.SubjectIdentifier') {#Abblix.SharedSignals.Transmitter.SubjectMatcher.Identical(Abblix.SecurityEvents.Subjects.SubjectIdentifier,Abblix.SecurityEvents.Subjects.SubjectIdentifier).second}

#### Returns
[System\.Boolean](https://learn.microsoft.com/en-us/dotnet/api/system.boolean 'System\.Boolean')

## SubjectMatcher\.Matches\(SubjectIdentifier, SubjectIdentifier\) Method {#Abblix.SharedSignals.Transmitter.SubjectMatcher.Matches(Abblix.SecurityEvents.Subjects.SubjectIdentifier,Abblix.SecurityEvents.Subjects.SubjectIdentifier)}

Decides whether two subjects match under Section 8\.1\.3\.1\. The relation is symmetric:
the section's rules read the same whichever side the receiver's subject is on\.

```csharp
public static bool Matches(Abblix.SecurityEvents.Subjects.SubjectIdentifier first, Abblix.SecurityEvents.Subjects.SubjectIdentifier second);
```
#### Parameters

###### `first` [Abblix\.SecurityEvents\.Subjects\.SubjectIdentifier](https://learn.microsoft.com/en-us/dotnet/api/abblix.securityevents.subjects.subjectidentifier 'Abblix\.SecurityEvents\.Subjects\.SubjectIdentifier') {#Abblix.SharedSignals.Transmitter.SubjectMatcher.Matches(Abblix.SecurityEvents.Subjects.SubjectIdentifier,Abblix.SecurityEvents.Subjects.SubjectIdentifier).first}

One subject \- conventionally the one added to the stream\.

###### `second` [Abblix\.SecurityEvents\.Subjects\.SubjectIdentifier](https://learn.microsoft.com/en-us/dotnet/api/abblix.securityevents.subjects.subjectidentifier 'Abblix\.SecurityEvents\.Subjects\.SubjectIdentifier') {#Abblix.SharedSignals.Transmitter.SubjectMatcher.Matches(Abblix.SecurityEvents.Subjects.SubjectIdentifier,Abblix.SecurityEvents.Subjects.SubjectIdentifier).second}

The other \- conventionally the event's subject\.

#### Returns
[System\.Boolean](https://learn.microsoft.com/en-us/dotnet/api/system.boolean 'System\.Boolean')