2861ce3b89
Details: http://golang.org/s/gobind LGTM=adonovan R=adonovan CC=golang-codereviews https://golang.org/cl/116800043
61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package seq
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//#cgo LDFLAGS: -llog
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//#include <android/log.h>
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//#include <string.h>
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//import "C"
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import (
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"fmt"
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"sync"
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)
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// refs stores Go objects that have been passed to another language.
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var refs struct {
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sync.Mutex
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next int32 // next reference number to use for Go object, always negative
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refs map[interface{}]int32
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objs map[int32]interface{}
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}
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func init() {
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refs.Lock()
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refs.next = -24 // Go objects get negative reference numbers. Arbitrary starting point.
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refs.refs = make(map[interface{}]int32)
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refs.objs = make(map[int32]interface{})
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refs.Unlock()
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}
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// A Ref represents a Java or Go object passed across the language
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// boundary.
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type Ref struct {
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Num int32
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}
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// Get returns the underlying object.
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func (r *Ref) Get() interface{} {
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refs.Lock()
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obj, ok := refs.objs[r.Num]
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refs.Unlock()
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if !ok {
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panic(fmt.Sprintf("unknown ref %d", r.Num))
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}
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return obj
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}
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// Delete remove the reference to the underlying object.
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func Delete(num int32) {
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refs.Lock()
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obj, ok := refs.objs[num]
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if !ok {
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panic(fmt.Sprintf("seq.Delete unknown refnum: %d", num))
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}
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delete(refs.objs, num)
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delete(refs.refs, obj)
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refs.Unlock()
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}
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