mirror of https://github.com/status-im/consul.git
49 lines
1.7 KiB
Go
49 lines
1.7 KiB
Go
package cache
|
|
|
|
import (
|
|
"time"
|
|
)
|
|
|
|
// Request is a cache-able request.
|
|
//
|
|
// This interface is typically implemented by request structures in
|
|
// the agent/structs package.
|
|
type Request interface {
|
|
// CacheInfo returns information used for caching this request.
|
|
CacheInfo() RequestInfo
|
|
}
|
|
|
|
// RequestInfo represents cache information for a request. The caching
|
|
// framework uses this to control the behavior of caching and to determine
|
|
// cacheability.
|
|
type RequestInfo struct {
|
|
// Key is a unique cache key for this request. This key should
|
|
// absolutely uniquely identify this request, since any conflicting
|
|
// cache keys could result in invalid data being returned from the cache.
|
|
Key string
|
|
|
|
// Token is the ACL token associated with this request.
|
|
//
|
|
// Datacenter is the datacenter that the request is targeting.
|
|
//
|
|
// Both of these values are used to partition the cache. The cache framework
|
|
// today partitions data on these values to simplify behavior: by
|
|
// partitioning ACL tokens, the cache doesn't need to be smart about
|
|
// filtering results. By filtering datacenter results, the cache can
|
|
// service the multi-DC nature of Consul. This comes at the expense of
|
|
// working set size, but in general the effect is minimal.
|
|
Token string
|
|
Datacenter string
|
|
|
|
// MinIndex is the minimum index being queried. This is used to
|
|
// determine if we already have data satisfying the query or if we need
|
|
// to block until new data is available. If no index is available, the
|
|
// default value (zero) is acceptable.
|
|
MinIndex uint64
|
|
|
|
// Timeout is the timeout for waiting on a blocking query. When the
|
|
// timeout is reached, the last known value is returned (or maybe nil
|
|
// if there was no prior value).
|
|
Timeout time.Duration
|
|
}
|