Go 鐃叔はワ申鐃初ー鐃緒申文鐃緒申鐃緒申鐃緒申咾鐃緒申襦�鐃夙わ申鐃緒申鐃獣につわ申鐃緒申
Go 鐃叔関随申鐃緒申鐃緒申鐃緒申佑離鐃緒申蕁種申鐃夙緒申未鐃緒申鐃夙わ申鐃祝￥申鐃緒申鐃初ー鐃緒申奪鐃緒申鐃緒申鐃緒申鐃淑醐申鐃緒申鐃緒申鐃緒申鐃緒申奪鐃緒申鐃緒申襯鰹申鐃緒申匹鐃渋醐申澆鐃緒申泙鐃緒申鐃� (鐃緒申)
鐃緒申鐃緒申蓮鐃� Go 鐃緒申鐃緒申鐃緒申鐃淳計とわ申鐃銃ワ申鐃初ー鐃緒申鐃緒申鐃緒申鐃熟種申鐃緒申辰鐃緒申蝓�標鐃緒申薀わ申屮鐃所が鐃緒申鐃初ー鐃緒申鐃緒申鐃緒申攣襪件申討鐃緒申襪�鐃緒申任鐃緒申腓�鐃緒申鐃緒申 鐃緒申鐃緒申鐃淳計わ申標鐃緒申薀わ申屮鐃緒申鐃�API鐃緒申鐃淳計わ申澆胴圓鐃緒申泙鐃緒申腓�鐃緒申
TL;DR
- 鐃緒申鐃緒申鐃淳計とわ申鐃銃は￥申Java的鐃純外鐃緒申鐃緒申鐃緒申同鐃緒申鐃淑常申痢鐃淑醐申鐃緒申鐃緒申鐃俊にわ申鐃淑わ申鐃祝ワ申鐃初ー鐃緒申鐃緒申鐃緒申鐃緒申能
- 鐃緒申鐃緒申鐃緒申 Go 鐃塾ワ申鐃初ー鐃祝関わ申鐃緒申哲鐃舜にわ申蝓�鐃緒申鐃緒申鐃緒申鐃緒申討鐃緒申覆鐃緒申鐃緒申蕁種申鐃渋随申鐃�
- 鐃渋際にワ申鐃初ー鐃緒申文鐃緒申鐃緒申鐃緒申咾鐃緒申鐃銃わ申鐃緒申鐃緒申鐃祝つわ申鐃銃の駕申鐃緒申
Go 鐃塾ワ申鐃初ー鐃緒申鐃緒申鐃緒申法
Java 鐃緒申鐃純外鐃緒申鐃緒申鐃叔は￥申鐃純外鐃薯キワ申奪鐃緒申鐃緒申襪随申鐃緒申鐃緒申鐃術の刻申文鐃緒申鐃術意わ申鐃緒申討鐃緒申蝓�鐃緒申鐃祝わ申鐃殉ッワ申鐃藷グわ申鐃暑こ鐃夙わ申鐃叔わ申鐃殉わ申鐃緒申 鐃緒申鐃緒申魯鐃緒申薀刻申離張蝓種申鐃渋わ申鐃緒申鐃緒申僂鐃緒申謄鐃緒申屮鐃緒申薀刻申鐃殉とわ申鐃淑�鐃緒申鐃緒申鐃暑こ鐃夙わ申任鐃緒申泙鐃緒申鐃� 鐃緒申鐃緒申鐃叔￥申同鐃緒申鐃緒申鐃初ス鐃叔わ申鐃粛にわ申螢�鐃初ー鐃緒申鐃緒申鐃緒申鐃循なわ申鐃緒申砲蓮鐃� try 鐃緒申優鐃緒申箸鐃緒申覆鐃緒申箸鐃緒申鐃緒申覆鐃緒申鐃緒申鐃緒申鐃緒申鐃粛�鐃緒申泙鐃緒申鐃�
鐃緒申鐃重�鐃緒申鐃緒申任鐃緒申鐃緒申鐃緒申祿逸申鐃� Errno 鐃緒申鐃初ス鐃叔￥申鐃淑わ申鐃緒申鐃縦わ申鐃緒申 errno 鐃緒申 EINTR 鐃塾常申鐃熟ワ申肇薀わ申鐃緒申鐃緒申鐃緒申鐃淑鰹申鐃塾ワ申鐃緒申鐃緒申鐃叔は緒申了鐃緒申鐃暑コ鐃緒申鐃宿はわ申鐃緒申鐃淑わ申泙鐃緒申鐃�
try {
while (true) {
try {
// ...
} catch (Errno e) {
if (e.getErrno() == Errno.EINTR) {
continue;
}
throw e;
}
}
} catch (Exception e) {
System.err.println(e.getMessage());
System.exit(1);
}
Go 鐃塾常申隋�鐃緒申鐃緒申的鐃祝ワ申鐃初ー鐃緒申 error 鐃夙わ申鐃緒申鐃緒申鐃藷タ￥申鐃春ワ申鐃緒申鐃緒申鐃祝わ申辰鐃緒申屬鐃緒申鐃殉わ申鐃緒申 Go 鐃祝はワ申鐃初ー鐃緒申鐃緒申鐃緒申鐃術の刻申文鐃熟わ申鐃緒申泙鐃緒申鵑�￥申鐃緒申鐃藷タ￥申鐃春ワ申鐃緒申鐃緒申鐃緒申鐃縮に使わ申鐃緒申 conversion 鐃緒申文鐃緒申 Java 鐃緒申 catch 鐃緒申同鐃緒申鐃淑常申竜鐃叔緒申鐃緒申鐃獣てわ申鐃緒申里如鐃緒申鐃緒申鐃祝なわ申泙鐃緒申鐃�conversion 鐃祝は種申鐃緒申2鐃緒申鐃緒申僚鐃緒申鐃緒申鐃緒申鐃緒申蝓�鐃緒申鐃縮にわ申辰道箸鐃淑�鐃緒申鐃殉わ申鐃緒申
// 鐃緒申鐃緒申廛鐃緒申 conversion.鐃緒申鐃� if 文鐃緒申鐃夙み刻申錣誌申道箸鐃緒申鐃緒申鐃緒申奮鐃緒申両鐃緒式鐃緒申if 文鐃祝書ける。
if nerr, ok := err.(net.Error); ok && nerr.Temporary() {
continue
}
// Type switch. 複鐃緒申鐃塾件申鐃塾随申鐃緒申分鐃緒申鐃薯見やす鐃緒申鐃書けわ申
switch e := err.(type) {
case net.Error:
if e.Temporary() {
continue
}
// ...
}
鐃渋際にわ申複鐃緒申鐃塾ワ申鐃初ー鐃緒申鐃薯扱わ申鐃緒申鐃緒申鐃緒申鐃熟わ申鐃殉わ申覆鐃緒申里函鐃� io.EOF 鐃緒申鐃粛に件申鐃叔はなわ申鐃緒申鐃緒申鐃緒申鐃俊わ申鐃暑エ鐃初ー鐃緒申鐃緒申鐃緒申里如鐃緒申鐃緒申鐃竣ワ申鐃� conversion 鐃緒申 if 文鐃緒申鐃夙み刻申錣誌申鐃緒申茲�鐃夙わ申鐃殉わ申鐃緒申
conversion 鐃熟駈申鐃塾件申鐃緒申鐃緒申鐃叔なわ申鐃縮わ申 interface 鐃舜わ申鐃術器申鐃緒申鐃叔緒申覆里如鐃� interface 鐃緒申鐃緒申欸鐃緒申箸鐃緒申道箸鐃緒申鐃緒申箸如鐃� Java 鐃緒申鐃純外鐃緒申鐃舜わ申同鐃緒申鐃処う鐃緒申複鐃緒申鐃塾件申鐃塾ワ申鐃初ー鐃緒申泙箸鐃銃逸申鐃緒申鐃緒申鐃夙わ申鐃叔わ申鐃殉わ申鐃緒申鐃純え鐃出￥申 syscall.Errno 鐃緒申 net.Error 鐃緒申鐃藷タ￥申鐃春ワ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申討鐃緒申鐃塾で￥申鐃緒申曚匹離鐃緒申鐃緒申匹麓鐃緒申里茲�鐃祝わ申鐃緒申鐃緒申的鐃祝書くわ申鐃夙わ申鐃叔わ申鐃殉わ申鐃緒申
defer r.Close()
for {
data, err := r.Read()
// 鐃叔醐申離如鐃緒申鐃緒申鐃緒申匹濆鐃緒申澆弔鐃�EOF鐃緒申鐃瞬わ申鐃緒申鐃緒申鐃緒申鐃塾で￥申鐃緒申鐃初ー鐃緒申鐃緒申鐃獣ワ申鐃緒申鐃�data鐃緒申鐃緒申鐃獣ワ申鐃緒申鐃緒申
if len(data) > 0 {
received <- data
}
if err == io.EOF {
break
}
if err != nil {
if nerr, ok := err.(net.Error); ok && nerr.Temporary() {
continue
}
log.Error(err)
break
}
}
Go 鐃塾ワ申鐃初ー鐃祝関わ申鐃緒申哲鐃緒申
Go 鐃塾削申圓琉鐃粛でわ申鐃緒申 Dave Cheney 鐃緒申鐃�Blog 鐃祝￥申Go鐃塾ワ申鐃初ー鐃緒申鐃出わ申鐃緒申鐃緒申廚鐃重�鐃舜わ申鐃述介さわ申討鐃緒申泙鐃緒申鐃�
In the majority of cases, error values returned from functions should be opaque to the caller. That is to say, a test that error is nil indicates if the call succeeded or failed, and that鐃緒申s all there is to it.
A small number of cases, generally revolving around interactions with the world outside your process, like network activity, require that the caller investigate the nature of the error to decide if it is reasonable to retry the operation.
鐃緒申:
鐃循とわ申匹離鐃緒申鐃緒申鐃緒申砲鐃緒申鐃緒申董鐃緒申愎鐃緒申鐃緒申屬鐃緒申鐃� error 鐃粛は呼び出わ申鐃緒申鐃祝とっわ申鐃緒申透鐃緒申鐃叔わ申鐃緒申戮鐃緒申任鐃緒申鐃� error 鐃緒申 nil 鐃緒申鐃宿わ申鐃緒申鐃緒申鐃緒申鐃獣ワ申鐃緒申鐃暑こ鐃夙で呼び出わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃宿わ申鐃緒申鐃緒申鐃塾るこ鐃夙わ申鐃叔わ申鐃緒申鐃緒申鐃緒申鐃銃わ申鐃緒申幣鐃塾わ申鐃夙はでわ申鐃殉わ申鐃緒申
鐃緒申鐃淑わ申鐃緒申鐃緒申鐃緒申鐃祝わ申鐃緒申鐃銃￥申鐃緒申縫優奪肇錙種申鐃緒申覆疋廛鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申箸鐃緒申箸蠅刻申鐃緒申鐃祝￥申鐃銃び出わ申側鐃緒申鐃緒申鐃初ー鐃塾種申鐃縮わ申調鐃駿て￥申鐃緒申鐃緒申鐃夙ライ鐃緒申鐃緒申戮鐃緒申鐃緒申匹鐃緒申鐃緒申鐃緒申鐃緒申必鐃竣わ申鐃緒申鐃緒申泙鐃緒申鐃�
鐃緒申鐃緒申 "error ... should be opaque to the caller" 鐃緒申鐃緒申分鐃熟￥申鐃緒申脳匆陲垢鐃� issue 鐃叔わ申 Go 鐃緒申 philosophy 鐃緒申鐃夙醐申鐃准わ申鐃緒申討鐃緒申泙鐃緒申鐃� 鐃緒申鐃緒申 Blog 鐃緒申鐃緒申鐃熟駕申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申隼廚鐃緒申泙鐃緒申鐃緒申鐃緒申鐃緒申鵑垢鐃夙種申鐃塾よう鐃緒申鐃緒申鐃祝になってわ申鐃緒申茲�鐃叔わ申鐃緒申
- 鐃緒申能鐃淑限わ申鐃緒申未龍鐃緒申鐃重�鐃淑ワ申鐃初ー鐃緒申鐃巡エ鐃初ー鐃緒申鐃緒申魯僖奪鐃緒申鐃緒申鐃緒申鐃緒申妨鐃緒申鐃緒申鐃緒申覆鐃�
- 鐃緒申鐃初ー鐃緒申鐃緒申鐃緒申必鐃竣な常申鐃熟￥申鐃緒申鐃緒申鐃�
Timeout() bool鐃緒申Temporary() bool鐃夙わ申鐃獣わ申鐃緒申的鐃祝縁申鐃緒申鐃緒申鐃潤ソ鐃獣ドわ申鐃緒申鐃緒申鐃緒申鐃�
鐃緒申鐃緒申鐃淳計誌申鐃循のわ申鐃緒申法鐃緒申鐃緒申鐃塾ワ申鐃初ー鐃緒申判鐃縮わ申鐃暑た鐃緒申縫鐃緒申蕁種申鐃獣ワ申鐃緒申鐃緒申鐃緒申文鐃緒申鐃緒申泪奪鐃緒申鐃緒申襪件申鐃緒申鐃祝￥申鐃緒申覆鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃殉わ申鐃緒申
Go 鐃緒申文鐃緒申鐃緒申妊鐃緒申蕁種申鐃夙緒申未鐃緒申討鐃緒申鐃緒申鐃緒申
鐃緒申鐃瞬よく文鐃緒申鐃緒申鐃緒申咾鐃緒申鐃銃わ申鐃殉ってわ申鐃暑エ鐃初ー鐃緒申鐃緒申鐃緒申鐃瞬わ申 net.errClosing 鐃叔わ申鐃緒申鐃緒申鐃緒申麓鐃緒申里茲�鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申討鐃緒申襯�鐃初ー鐃緒申鐃緒申任鐃緒申鐃�
errClosing = errors.New("use of closed network connection")
鐃緒申鐃塾ワ申鐃初ー鐃熟￥申 Close 鐃緒申鐃曙た Listener 鐃緒申 Conn 鐃緒申 Accept(), Read(), Write(), Close() 鐃淑どのメソ鐃獣ドわ申討喀个鐃緒申鐃緒申鐃緒申鐃緒申屬鐃緒申鐃殉わ申鐃緒申
鐃緒申鐃塾ワ申鐃初ー鐃緒申 net 鐃術ッワ申鐃緒申鐃緒申鐃緒申鐃夙わ申鐃緒申鐃緒申佑箸鐃緒申鐃緒申屬鐃緒申鐃緒申肇謄鐃緒申鐃緒申鐃叔わ申鐃緒申鐃夙わ申鐃銃わ申鐃初ず鐃緒申 if err == errClosing 鐃塾よう鐃淑使わ申鐃緒申鐃熟わ申鐃緒申討鐃緒申泙鐃緒申鐃�
鐃緒申鐃塾ワ申鐃初ー鐃緒申鐃緒申鐃緒申鐃獣わ申鐃銃び出わ申側鐃熟わ申鐃叔わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃縮居申鐃緒申里如鐃� "should be opaque" 鐃淑のわ申鐃夙思わ申鐃殉わ申鐃緒申
鐃緒申鐃緒申鐃叔￥申 Go 鐃熟ネットワー鐃緒申鐃塾ブワ申鐃獣ワ申鐃緒申IO鐃緒申鐃藷タワ申鐃緒申捻鐃緒申辰鐃緒申謄離鐃瞬ワ申鐃獣ワ申鐃緒申IO鐃緒申API鐃緒申鐃藷供わ申鐃銃わ申鐃緒申鐃緒申鐃淑ので￥申 Listener.Accept() 鐃緒申 Conn.Read() 鐃熟呼び出わ申側鐃緒申屮鐃緒申奪鐃緒申鐃緒申泙鐃緒申鐃緒申鐃緒申鐃緒申離瓮緒申奪匹鐃緒申鐃緒申僂鐃緒申鐃夙わ申鐃緒申鐃緒申立鐃緒申鐃緒申 goroutine 鐃緒申箸鐃緒申泙鐃緒申鐃緒申鐃緒申鐃緒申鐃� Accept() 鐃緒申 Read() 鐃緒申鐃銃わ申鐃緒申 goroutine 鐃緒申澆鐃緒申鐃緒申覆蓮鐃緒申鐃緒申鐃� Listener 鐃緒申 Conn 鐃緒申 Close() 鐃緒申鐃暑こ鐃夙でわ申鐃緒申鐃緒申鐃緒申的鐃緒申鐃淳計のネットワー鐃緒申鐃竣ワ申鐃緒申鐃緒申鐃叔￥申鐃緒申鐃緒申呂箸鐃緒申董鐃� errClosing 鐃緒申鐃瞬わ申里任鐃緒申鐃�
errClosing 鐃塾よう鐃淑駕申鐃緒申鐃緒申能鐃淑ワ申鐃初ー鐃緒申発鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申的鐃淑醐申鐃緒申鐃緒申蓮鐃�Conn鐃叔わ申鐃緒申个鐃緒申離鐃緒申奪鐃緒申鐃緒申鐃塾てる、Listener 鐃叔わ申鐃緒申丱廛鐃緒申鐃緒申鐃準自鐃塾わ申澆鐃暑こ鐃夙でわ申鐃緒申鐃緒申鐃緒申鐃塾際にワ申鐃初ー鐃緒申鐃緒申鐃緒申暴颪�べわ申鐃叔わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申 errClosing 鐃塾よう鐃緒申鐃緒申鐃緒申呂鐃夙�鐃緒申鐃緒申鐃暑エ鐃初ー鐃薯エラー鐃緒申鐃緒申鐃祝書いてわ申鐃緒申鐃初、鐃緒申鐃緒申鐃竣なワ申鐃初ー鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申討鐃緒申泙鐃緒申泙鐃緒申鐃�
Close() 鐃緒申鐃緒申鐃緒申鐃夙わ申 Accept() 鐃緒申 Read() 鐃塾ワ申鐃初ー鐃緒申無鐃暑す鐃暑こ鐃夙わ申任鐃緒申泙鐃緒申鐃緒申鐃� Close() 鐃緒申鐃緒申里鐃緒申未鐃� goroutine 鐃淑のわ申鐃緒申鐃楯でわ申鐃緒申鐃緒申 errClosing 鐃淑鰹申鐃塾ワ申鐃初ー鐃殉わ申無鐃暑し鐃銃わ申鐃殉わ申鐃緒申能鐃緒申鐃緒申鐃緒申鐃暑気鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申弔鐃殉わ申鐃緒申
鐃緒申鐃緒申 errClosing 鐃緒申鐃緒申鐃緒申鐃緒申討曚鐃緒申鐃緒申箸鐃緒申鐃� Issue golang/go#4373 鐃緒申鐃緒申鐃所、鐃緒申鐃初ー鐃緒申鐃緒申鐃祝書きわ申鐃緒申鐃淑わ申鐃夙わ申鐃緒申鐃醇ー鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申討鐃緒申譴随申鐃縮￥申 Won't fix 鐃緒申戰襪�鐃緒申鐃緒申鐃緒申鐃殉わ申鐃緒申鐃緒申鐃殉わ申鐃緒申鐃緒申鐃緒申鐃緒申鐃夙件申泙辰鐃緒申錣縁申任呂鐃緒申鐃殉わ申鐃藷が￥申鐃淳計者わ申鐃緒申鐃緒申焚鐃緒申鐃緒申任鐃緒申覆鐃緒申鐃緒申蕁種申鐃緒申鐃縮に醐申鐃緒申鐃緒申必鐃竣わ申鐃淑わ申鐃祝と実際のユー鐃緒申鐃緒申鐃緒申鐃緒申鐃淑わ申鐃塾ワ申鐃初ー鐃熟ワ申鐃緒申鐃祝書きわ申鐃緒申鐃淑わ申鐃祝のミワ申鐃殉ッワ申鐃塾逸申鐃瞬わ申鐃緒申鐃緒申隼廚鐃緒申泙鐃緒申鐃�
go#4373 鐃夙器申連鐃緒申鐃緒申 Issue 鐃夙わ申鐃銃￥申golang/go#9405 鐃盾あ鐃緒申泙鐃緒申鐃�
鐃緒申鐃緒申鐃緒申蓮鐃� http 鐃緒申鐃初イ鐃緒申鐃緒申箸鬟織鐃緒申爛�鐃緒申鐃緒申鐃春わ申鐃緒申鐃緒申鐃術わ申鐃緒申鐃楯わ申 (Timeout() bool 鐃緒申鐃緒申鐃緒申鐃緒申討鐃緒申覆鐃�) errClosing 鐃緒申鐃緒申鐃塾まわ申鐃瞬わ申鐃緒申討鐃緒申泙鐃緒申箸鐃緒申鐃緒申鐃緒申鐃叔￥申鐃緒申発鐃緒申鐃� Go 1.5 鐃叔は緒申鐃緒申鐃術みわ申鐃緒申鐃緒申覆里任鐃緒申鐃緒申鐃緒申鐃緒申潺鐃所ー鐃緒申鐃緒申鐃緒申討鐃緒申鐃� Go 1.4 鐃殉でではワ申鐃緒申鐃準ア鐃緒申鐃夙わ申鐃緒申鐃緒申鐃宿わ申鐃緒申鐃緒申判鐃所す鐃暑た鐃緒申鐃� errClosing 鐃緒申文鐃緒申鐃緒申鐃緒申咾鐃宿�鐃竣になってわ申鐃殉ってわ申鐃殉わ申鐃緒申
鐃緒申鐃塾よう鐃祝￥申鐃処し鐃緒申多鐃緒申鐃緒申無鐃緒申鐃緒申里痢鐃緒申澤彈圓鐃緒申鐃緒申蠅件申討鐃緒申覆鐃緒申罅種申鐃緒申鐃緒申鐃緒申鐃緒申鐃出ワ申鐃祝わ申螢�鐃初ー鐃緒申文鐃緒申鐃緒申鐃緒申咾鐃夙緒申蠅件申討鐃緒申襯縁申鐃緒申鐃緒申鐃緒申鐃叔逸申覆鐃緒申鐃渋醐申澆鐃緒申泙鐃緒申鐃� 鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃緒申鐃殉でもこ鐃緒申鐃緒申鐃純外鐃叔わ申鐃獣て￥申 Go 鐃塾ワ申鐃初ー鐃緒申鐃緒申鐃緒申鐃遵い鐃緒申鐃初エ鐃初ー鐃緒申文鐃緒申鐃緒申鐃緒申咾鐃緒申覆鐃緒申箸鐃緒申鐃緒申覆鐃緒申箸鐃緒申辰鐃緒申茲�鐃淑わ申鐃夙はなわ申鐃緒申 Go 鐃緒申哲鐃舜は醐申鐃緒申的鐃祝わ申鐃殉わ申鐃緒申能鐃緒申鐃銃わ申鐃緒申隼廚鐃緒申泙鐃緒申鐃�
@methane
