@0xd75a34c00d06ab36;

using Common = import "common.capnp";

struct Update {
    newResource @0 :List(Resource);
    # List of new resources that were created since the last Update was sent

    statsUpdate @1 :Common.IntMap(Stats);
    # All resource stats that have changed since the last update

    newPollOps @2 :List(PollOp);
    # List of all new poll ops that have been invoked on resources since the last update

    droppedEvents @3 :UInt64;
    # Count of how many resource events were not recorded because the applications event buffer was
    # at capacity.
    #
    # If everything is working normally, this is 0. If it is not that may inidcate that some data is
    # missing from this update and it may be necessary to increase the number of events buffered by
    # the application to ensure that data loss is avoided.
    #
    # If the application's instrumentation ensures reliable delivery of events, this will alway be 0
}

struct Resource {
    id @0 :Common.Id;
    # The resource's ID.
    #
    # This uniquely identifies this resource across all *currently live* resoures.

    metadata @1 :Common.MetaId;
    # Numeric ID of the resource's Metadata.

    concreteType @2 :Text;
    # Name of the concrete Rust type of this resource

    kind @3 :Kind;
    # The kind of this resource
    struct Kind {
        union {
            known @0 :WellKnown;
            other @1 :Text;
        }

        enum WellKnown {
            timer @0;
        }
    }

    location @4 :Common.Location;
    # The location in code where this resource was created

    parentResourceId @5 :Common.Id;
    # ID of the parent resource

    internal @6 :Bool;
    # Wether or not this resource is an internal component of another resource
}

struct Stats {
    # Task runtime stats of a resource

    createdAt @0 :Common.Timestamp;
    # Timestamp of when the resource was created

    droppedAt @1 :Common.Timestamp;
    # Timestamp of when the resource was dropped

    attributes @2 :List(Common.Attribute);
    # State attributes of the resource. These are dependent on the type of the resource. For example
    # a timer resource will have a duration, while a semaphore resource may have permits as an
    # attribute. These values may change over time as the state of the resource changes. Therefore
    # they live in the runtime stats rather than the static data describing the resource
}

struct PollOp {
    metadata @1 :Common.MetaId;
    # Numeric ID of the op's Metadata
    # 
    # This identifies the `Metadata` that describes the `tracing` span corresponding to this op. The
    # metadata for this ID will have been sent in a prior `RegisterMetadata` message.

    resource @0 :Common.Id;
    # The resource's ID

    name @2 :Text;
    # Name of this op (e.g. poll_elapsed, new_timeout, reset, etc.)

    task @3 :Common.Id;
    # The ID of the task context that this poll op has been called from

    asyncOp @4 :Common.Id;
    # The ID of the async op that this poll op is part of

    ready @5 :Bool;
    # Wheter this poll op has return with `Ready` or not.
}