sessionctx

type Context interface {
	planctx.Common
	// EncodeStates encodes session states into a JSON.
	EncodeStates(context.Context, *sessionstates.SessionStates) error
	// DecodeStates decodes a map into session states.
	DecodeStates(context.Context, *sessionstates.SessionStates) error
	tablelock.TableLockContext
	// RollbackTxn rolls back the current transaction.
	RollbackTxn(ctx context.Context)
	// CommitTxn commits the current transaction.
	// buffered KV changes will be discarded, call StmtCommit if you want to commit them.
	CommitTxn(ctx context.Context) error
	// GetSchemaValidator returns the schema validator.
	GetSchemaValidator() validatorapi.Validator
	// GetSQLServer returns the sqlsvrapi.Server.
	GetSQLServer() sqlsvrapi.Server
	// GetTableCtx returns the table.MutateContext
	GetTableCtx() tblctx.MutateContext
	// GetPlanCtx gets the plan context of the current session.
	GetPlanCtx() planctx.PlanContext
	// GetDistSQLCtx gets the distsql ctx of the current session
	GetDistSQLCtx() *distsqlctx.DistSQLContext
	// RefreshTxnCtx commits old transaction without retry,
	// and creates a new transaction.
	// now just for load data and batch insert.
	RefreshTxnCtx(context.Context) error
	// GetSessionPlanCache returns the session-level cache of the physical plan.
	GetSessionPlanCache() SessionPlanCache
	// StmtCommit flush all changes by the statement to the underlying transaction.
	// it must be called before CommitTxn, else all changes since last StmtCommit
	// will be lost. For SQL statement, StmtCommit or StmtRollback is called automatically.
	// the "Stmt" not only means SQL statement, but also any KV changes, such as
	// meta KV.
	StmtCommit(ctx context.Context)
	// StmtRollback provides statement level rollback. The parameter `forPessimisticRetry` should be true iff it's used
	// for auto-retrying execution of DMLs in pessimistic transactions.
	// if error happens when you are handling batch of KV changes since last StmtCommit
	// or StmtRollback, and you don't want them to be committed, you must call StmtRollback
	// before you start another batch, otherwise, the previous changes might be committed
	// unexpectedly.
	StmtRollback(ctx context.Context, isForPessimisticRetry bool)
	// IsDDLOwner checks whether this session is DDL owner.
	IsDDLOwner() bool
	// PrepareTSFuture uses to prepare timestamp by future.
	PrepareTSFuture(ctx context.Context, future oracle.Future, scope string) error
	// GetPreparedTxnFuture returns the TxnFuture if it is valid or pending.
	// It returns nil otherwise.
	GetPreparedTxnFuture() TxnFuture
	// GetTxnWriteThroughputSLI returns the TxnWriteThroughputSLI.
	GetTxnWriteThroughputSLI() *sli.TxnWriteThroughputSLI
	// GetBuiltinFunctionUsage returns the BuiltinFunctionUsage of current Context, which is not thread safe.
	// Use primitive map type to prevent circular import. Should convert it to telemetry.BuiltinFunctionUsage before using.
	GetBuiltinFunctionUsage() map[string]uint32
	// GetStmtStats returns stmtstats.StatementStats owned by implementation.
	GetStmtStats() *stmtstats.StatementStats
	// ShowProcess returns ProcessInfo running in current Context
	ShowProcess() *sessmgr.ProcessInfo
	// GetAdvisoryLock acquires an advisory lock (aka GET_LOCK()).
	GetAdvisoryLock(string, int64) error
	// IsUsedAdvisoryLock checks for existing locks (aka IS_USED_LOCK()).
	IsUsedAdvisoryLock(string) uint64
	// ReleaseAdvisoryLock releases an advisory lock (aka RELEASE_LOCK()).
	ReleaseAdvisoryLock(string) bool
	// ReleaseAllAdvisoryLocks releases all advisory locks that this session holds.
	ReleaseAllAdvisoryLocks() int
	// GetExtensions returns the `*extension.SessionExtensions` object
	GetExtensions() *extension.SessionExtensions
	// InSandBoxMode indicates that this Session is in sandbox mode
	// Ref about sandbox mode: https://dev.mysql.com/doc/refman/8.0/en/expired-password-handling.html
	InSandBoxMode() bool
	// EnableSandBoxMode enable the sandbox mode of this Session
	EnableSandBoxMode()
	// DisableSandBoxMode enable the sandbox mode of this Session
	DisableSandBoxMode()
	// ReportUsageStats reports the usage stats to the global collector
	ReportUsageStats()
	// NewStmtIndexUsageCollector creates a new index usage collector for statement
	NewStmtIndexUsageCollector() *indexusage.StmtIndexUsageCollector
	// GetCursorTracker returns the cursor tracker of the session
	GetCursorTracker() cursor.Tracker
	// GetCommitWaitGroup returns the wait group for async commit and secondary lock cleanup background goroutines
	GetCommitWaitGroup() *sync.WaitGroup
	// GetTraceCtx returns the context bind with trace information.
	// The trace information is set when entering server/conn.dispatch and reset after dispatch returns.
	// The context only contains the initial trace information, which is used to track the execution of the current statement.
	// During the execution of the statement, additional information may be added to the context, like context.WithValue(), that is not included.
	GetTraceCtx() context.Context
}

type InstancePlanCache interface {
	// Get gets the cached value from the cache according to key and opts.
	Get(key string, paramTypes any) (value any, ok bool)
	// Put puts the key and value into the cache.
	Put(key string, value, paramTypes any) (succ bool)
	// All returns all cached values.
	// Returned values are read-only, don't modify them.
	All() (values []any)
	// Evict evicts some cached values.
	Evict(evictAll bool) (detailInfo string, numEvicted int)
	// Size returns the number of cached values.
	Size() int64
	// MemUsage returns the total memory usage of this plan cache.
	MemUsage() int64
	// GetLimits returns the soft and hard memory limits of this plan cache.
	GetLimits() (softLimit, hardLimit int64)
	// SetLimits sets the soft and hard memory limits of this plan cache.
	SetLimits(softLimit, hardLimit int64)
}

type SessionPlanCache interface {
	Get(key string, paramTypes any) (value any, ok bool)
	Put(key string, value, paramTypes any)
	Delete(key string)
	DeleteAll()
	Size() int
	SetCapacity(capacity uint) error
	Close()
}

type SessionStatesHandler interface {
	// EncodeSessionStates encodes session states into a JSON.
	EncodeSessionStates(context.Context, Context, *sessionstates.SessionStates) error
	// DecodeSessionStates decodes a map into session states.
	DecodeSessionStates(context.Context, Context, *sessionstates.SessionStates) error
}

type TxnFuture interface {
	// Wait converts pending txn to valid
	Wait(ctx context.Context, sctx Context) (kv.Transaction, error)
}