ISnapshotHolder

Process(T) : T

Process change.

change

change.

返回值: change (diff or snapshot clone on first call).

ResetSnapshot(SecurityId)

Reset snapshot for the specified security.

securityId

Security ID.

TryGetSnapshot(SecurityId, T) : bool

Try get snapshot for the specified security.

securityId

Security ID.

snapshot

Snapshot if exists, otherwise .

返回值: true if snapshot exists; otherwise false.