github.com/swiftstack/ProxyFS@v0.0.0-20210203235616-4017c267d62f/pfsagentd/LeaseRequestClient.uml (about)

     1  @startuml
     2  
     3  scale 800 width
     4  
     5  state None : No lease held
     6  state SharedLeaseRequested : Awaiting ProxyFS to grant either\nSharedLease or ExclusiveLease
     7  state SharedLeaseGranted : Able to grant multiple SharedLocks
     8  state SharedLeasePromoting : Awaiting ProxyFS to grant ExclusiveLease\nor be forced to release SharedLease
     9  state PreparingToReleaseSharedLease : Draining SharedLocks and invalidating\nCached Attributes and ExtentMap
    10  state SharedLeaseReleasing : Awaiting ProxyFS to acknowledge\nSharedLease has been released
    11  state ExclusiveLeaseRequested : Awaiting ProxyFS to\ngrant ExclusiveLease
    12  state ExclusiveLeaseGranted : Able to grant multiple\nSharedLocks or one ExclusiveLock
    13  state PreparingToReleaseExclusiveLease : Draining Locks, invalidating Cached\nAttributes and ExtentMap, and\nflushing in-flight LogSegment PUTs
    14  state ExclusiveLeaseReleasing : Awaiting ProxyFS to acknowledge\nExclusiveLease has been released
    15  state PreparingToDemoteExclusiveLease : Flushing in-flight LogSegment PUTs
    16  state ExclusiveLeaseDemoting : Awaiting ProxyFS to acknowlege ExclusiveLease\nhas been demoted to a SharedLease
    17  
    18  [*] --> None
    19  
    20  None --> SharedLeaseRequested
    21  None --> ExclusiveLeaseRequested
    22  
    23  SharedLeaseRequested --> SharedLeaseGranted
    24  SharedLeaseRequested --> ExclusiveLeaseGranted
    25  
    26  SharedLeaseGranted --> PreparingToReleaseSharedLease
    27  PreparingToReleaseSharedLease --> SharedLeaseReleasing
    28  SharedLeaseReleasing --> None
    29  
    30  SharedLeaseGranted --> SharedLeasePromoting
    31  SharedLeasePromoting --> PreparingToReleaseSharedLease
    32  SharedLeasePromoting --> ExclusiveLeaseGranted
    33  
    34  ExclusiveLeaseRequested --> ExclusiveLeaseGranted
    35  
    36  ExclusiveLeaseGranted --> PreparingToReleaseExclusiveLease
    37  PreparingToReleaseExclusiveLease --> ExclusiveLeaseReleasing
    38  ExclusiveLeaseReleasing --> None
    39  
    40  ExclusiveLeaseGranted --> PreparingToDemoteExclusiveLease
    41  PreparingToDemoteExclusiveLease --> ExclusiveLeaseDemoting
    42  ExclusiveLeaseDemoting --> SharedLeaseGranted
    43  
    44  @enduml