62 lines
1.9 KiB
Go
62 lines
1.9 KiB
Go
package store
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import (
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"fmt"
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"time"
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"github.com/coreos/etcd/third_party/github.com/goraft/raft"
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)
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// A lookup of factories by version.
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var factories = make(map[int]CommandFactory)
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var minVersion, maxVersion int
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// The CommandFactory provides a way to create different types of commands
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// depending on the current version of the store.
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type CommandFactory interface {
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Version() int
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CreateUpgradeCommand() raft.Command
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CreateSetCommand(key string, dir bool, value string, expireTime time.Time) raft.Command
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CreateCreateCommand(key string, dir bool, value string, expireTime time.Time, unique bool) raft.Command
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CreateUpdateCommand(key string, value string, expireTime time.Time) raft.Command
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CreateDeleteCommand(key string, dir, recursive bool) raft.Command
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CreateCompareAndSwapCommand(key string, value string, prevValue string,
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prevIndex uint64, expireTime time.Time) raft.Command
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CreateCompareAndDeleteCommand(key string, prevValue string, prevIndex uint64) raft.Command
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CreateSyncCommand(now time.Time) raft.Command
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}
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// RegisterCommandFactory adds a command factory to the global registry.
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func RegisterCommandFactory(factory CommandFactory) {
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version := factory.Version()
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if GetCommandFactory(version) != nil {
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panic(fmt.Sprintf("Command factory already registered for version: %d", factory.Version()))
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}
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factories[version] = factory
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// Update compatibility versions.
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if minVersion == 0 || version > minVersion {
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minVersion = version
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}
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if maxVersion == 0 || version > maxVersion {
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maxVersion = version
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}
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}
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// GetCommandFactory retrieves a command factory for a given command version.
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func GetCommandFactory(version int) CommandFactory {
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return factories[version]
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}
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// MinVersion returns the minimum compatible store version.
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func MinVersion() int {
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return minVersion
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}
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// MaxVersion returns the maximum compatible store version.
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func MaxVersion() int {
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return maxVersion
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}
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