...
| Code Block |
|---|
rule store_name {
select when echo name
pre{
name = event:attr(attrs{"name")}.klog("our passed in name: ")
}
send_directive("store_name", {"name":name})
fired{
ent:name := name
}
} |
...
| Code Block |
|---|
rule hello_world {
select when echo hello
pre {
name = event:attr(attrs{"name")}.klog("our passed in name: ")
.defaultsTo(ent:name,"use stored name")
}
send_directive("say", {"something": "Hello " + name})
} |
...
| Code Block |
|---|
rule hello_world {
select when echo hello
pre {
name = event:attr(attrs{"name")}.klog("our passed in name: ")
|| ent:name.klog("use stored name")
}
send_directive("say", {"something": "Hello " + name})
} |
As an aside, this use of the Boolean or operator (`||`) is a shorter form, for this particular case, of using the Boolean ternary operator, shown in context here:
| Code Block |
|---|
name = event:attr(attrs{"name")}.klog("our passed in name: ") => event:attr(attrs{"name")} | ent:name.klog("use stored name") |
...
Replace the entire prelude with the code shown below:
| Code Block |
|---|
id = event:attr(attrs{"id")} || "_0" first = ent:name{[id,"name","first"]} last = ent:name{[id,"name","last"]} name = first + " " + last |
...
| Code Block |
|---|
rule store_name {
select when echo name
pre{
passed_id = event:attr(attrs{"id")}.klog("our passed in id: ")
passed_first_name = event:attr(attrs{"first_name")}.klog("our passed in first_name: ")
passed_last_name = event:attr(attrs{"last_name")}.klog("our passed in last_name: ")
}
send_directive("store_name", {
"id" : passed_id,
"first_name" : passed_first_name,
"last_name" : passed_last_name
})
always{
ent:name := ent:name.defaultsTo(clear_name, "initialization was needed");
ent:name := ent:name.put([passed_id,"name","first"], passed_first_name)
.put([passed_id,"name","last"], passed_last_name)
}
} |
...
| Code Block |
|---|
pre{
id = event:attr(attrs{"id")} || "_0"
name = name(id)
} |
...
| Code Block |
|---|
rule hello_world {
select when echo hello
pre{
id = event:attr(attrs{"id")} || "_0"
name = name(id)
visits = ent:name{[id,"visits"]}.defaultsTo(0)
}
send_directive("say", {"something":"Hello " + name})
fired {
ent:name{[id,"visits"]} := visits + 1
}
} |
...