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Add callback based result retrieval for asyncAwaitAny.

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This can be used to safely retrieve scoped data.
This commit is contained in:
Sönke Ludwig 2017-01-15 23:55:37 +01:00
parent f3c84d497e
commit 32d360baac
1 changed files with 22 additions and 3 deletions
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25
source/vibe/internal/async.d
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@ -42,12 +42,22 @@ nothrow {
return tuple(waitable.results);
}
struct Waitable(alias wait, alias cancel, CB) {
struct Waitable(alias wait, alias cancel, CB, on_result...)
if (on_result.length <= 1)
{
import std.traits : ReturnType;
alias Callback = CB;
ParameterTypeTuple!Callback results;
static if (on_result.length == 0) {
ParameterTypeTuple!Callback results;
void setResult(ref ParameterTypeTuple!Callback r) { this.results = r; }
} else {
import std.format : format;
alias PTypes = ParameterTypeTuple!Callback;
mixin(q{void setResult(%s) { on_result[0](%s); }}.format(generateParamDecls!Callback, generateParamNames!Callback));
}
bool cancelled;
auto waitCallback(Callback cb) nothrow { return wait(cb); }
@ -107,7 +117,7 @@ void asyncAwaitAny(bool interruptible, string func = __FUNCTION__, Waitables...)
fired[i] = true;
any_fired = true;
static if (PTypes.length)
waitables[i].results = AliasSeq!(%s);
waitables[i].setResult(%s);
if (t != Task.init) switchToTask(t);
}}.format(generateParamDecls!(CBDel!W), generateParamNames!(CBDel!W)));
callbacks[i] = cb;
@ -186,6 +196,12 @@ private struct ScopeGuard { @safe nothrow: void delegate() op; ~this() { if (op
(cb) { c++; },
void delegate(int) @safe nothrow
) w2;
Waitable!(
(cb) { c++; cb(42); },
(cb) { assert(false); },
void delegate(int) @safe nothrow,
(int n) { assert(n == 42); }
) w3;
asyncAwaitAny!false(w1, w2);
assert(w1.results[0] == 42 && w2.results[0] == 0);
@ -194,6 +210,9 @@ private struct ScopeGuard { @safe nothrow: void delegate() op; ~this() { if (op
asyncAwaitAny!false(w2, w1);
assert(w1.results[0] == 42 && w2.results[0] == 0);
assert(a == 2 && b == 1 && c == 1);
asyncAwaitAny!false(w3);
assert(c == 2);
}
private string generateParamDecls(Fun)()