mirror of https://github.com/jackc/pgx.git
78 lines
2.2 KiB
Go
78 lines
2.2 KiB
Go
package stmtcache
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import (
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"math"
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"github.com/jackc/pgx/v5/pgconn"
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)
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// UnlimitedCache implements Cache with no capacity limit.
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type UnlimitedCache struct {
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m map[string]*pgconn.StatementDescription
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invalidStmts []*pgconn.StatementDescription
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}
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// NewUnlimitedCache creates a new UnlimitedCache.
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func NewUnlimitedCache() *UnlimitedCache {
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return &UnlimitedCache{
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m: make(map[string]*pgconn.StatementDescription),
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}
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}
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// Get returns the statement description for sql. Returns nil if not found.
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func (c *UnlimitedCache) Get(sql string) *pgconn.StatementDescription {
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return c.m[sql]
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}
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// Put stores sd in the cache. Put panics if sd.SQL is "". Put does nothing if sd.SQL already exists in the cache.
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func (c *UnlimitedCache) Put(sd *pgconn.StatementDescription) {
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if sd.SQL == "" {
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panic("cannot store statement description with empty SQL")
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}
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if _, present := c.m[sd.SQL]; present {
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return
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}
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c.m[sd.SQL] = sd
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}
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// Invalidate invalidates statement description identified by sql. Does nothing if not found.
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func (c *UnlimitedCache) Invalidate(sql string) {
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if sd, ok := c.m[sql]; ok {
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delete(c.m, sql)
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c.invalidStmts = append(c.invalidStmts, sd)
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}
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}
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// InvalidateAll invalidates all statement descriptions.
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func (c *UnlimitedCache) InvalidateAll() {
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for _, sd := range c.m {
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c.invalidStmts = append(c.invalidStmts, sd)
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}
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c.m = make(map[string]*pgconn.StatementDescription)
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}
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// GetInvalidated returns a slice of all statement descriptions invalidated since the last call to RemoveInvalidated.
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func (c *UnlimitedCache) GetInvalidated() []*pgconn.StatementDescription {
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return c.invalidStmts
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}
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// RemoveInvalidated removes all invalidated statement descriptions. No other calls to Cache must be made between a
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// call to GetInvalidated and RemoveInvalidated or RemoveInvalidated may remove statement descriptions that were
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// never seen by the call to GetInvalidated.
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func (c *UnlimitedCache) RemoveInvalidated() {
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c.invalidStmts = nil
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}
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// Len returns the number of cached prepared statement descriptions.
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func (c *UnlimitedCache) Len() int {
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return len(c.m)
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}
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// Cap returns the maximum number of cached prepared statement descriptions.
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func (c *UnlimitedCache) Cap() int {
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return math.MaxInt
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}
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