33
Replies
The scope simply is NOT locked.
By Charlie Arehart
No one says it is. I, in particular, have been talking all along about "session-scoped locks". In any case, I have included code, where necessary, to clarify what I mean. The proof of the pudding is in the eating.
All that said, my original reply to you on this was that the updates in Zachary's two requests will NOT block each other.
By Charlie Arehart
It is unnecessary to tell me that. It is clear from the discussion that I am aware of it. Otherwise, why else would I be suggesting. as an alternative. a lock to enable requests to "block" each other?
Hello friends--I have also provided my own reproduction:
application.cfc
public void function onRequestEnd(TargetPage) {
if (TargetPage == '/test2.cfc' || TargetPage == '/test3.cfc') {
session[TargetPage & ' end time'] = now()
}
return
}
public boolean function onRequestStart(required string TargetPage) {
if (TargetPage == '/test2.cfc' || TargetPage == '/test3.cfc') {
session[TargetPage & ' start time'] = now()
}
return
}
test.cfm
<cfif !SESSION.keyExists('myVariable')>
<cfset SESSION.myVariable = 0>
</cfif>
<!DOCTYPE html>
<html>
<head>
<title>Test Page</title>
<script>
async function sendRequests() {
fetch('test2.cfc?method=request1')
.then(function(response) { return response.text(); })
.then(function(data) { console.log('Response from request1:', data); })
await setTimeout(250)
fetch('test2.cfc?method=request2')
.then(function(response) { return response.text(); })
.then(function(data) { console.log('Response from request2:', data); })
}
</script>
</head>
<body>
<button type="button" onclick="sendRequests()">Click Me</button>
<cfdump var=#SESSION#>
</body>
</html>
test2.cfc
component {
remote numeric function request1() returnformat="JSON" {
sleep(2000);
lock scope="session" type="exclusive" timeout="3" {
session.myVariable = 2;
return session.myVariable;
}
}
remote numeric function request2() returnformat="JSON" {
sleep(2000);
lock scope="session" type="readonly" timeout="3" {
return session.myVariable;
}
}
}
In sum, myVariable is still 0, even though the request1 is return the new value (2), but request 2 overwrites not only myVariable, but also the /test1.cfc start time and /test1.cfc end time variables. Basically, the whole session is persisted with no care for what was already in the session.
Correct me if my implementation was poor, but it seems the locks are not solving this issue.
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