CompositeKeyGen

Allows to create composite key encoded as Int64 (long).

Usually you should use these identifiers in domain objects (aggregates).

Each key is composed from 3 elements:

• instanceId - could be server identifier
• tenantId - could be tenant identifier
• sequenceId - incrementing identifier from other source

Configuration

This should be done once at application startup:

// Define configuration
var config = new MaskConfig(instanceBits: 5, tenantBits: 14);

// Create key generator
var serverId = _application.Configuration.GetServerId(); // this is your code :)
var generator = new KeyGenerator(serverId, config);

Configuration defined above will give you the following maximum values:

   Max InstanceId:     31
   Max TenantId:       16383
   Max SequenceId:     17592186044415

For given configuration max sequenceId will be 8192 times bigger than int.MaxValue.

Usage

When you need to create key:

// Create key providing tenantId and sequenceId
var sequenceId = _hiloGenerator.GetNext(); // this is your code :)
var id = generator.Create(tenantId, sequenceId);

Instead of HiLo you can use LinearKeyAllocator.

Output for example data:

    For:
        instanceId = 1;
        tenantId = 10;
        sequenceId = 100;

    Created id will be:
        long id = 288406298012156004

When you need to verify key for given tenantId you can reconstruct provided identifier:

CompositeKey reconstructed = generator.Reconstruct(id);
if (reconstructed.TenantId != _userContext.TenantId) throw...