eval_cached event: change interface to traceID\tjobsetID\tevaluationID

I was not going to break the interface until I noticed
the current implementation uses the string literal \t.

src/lib/Hydra/Event/EvalCached.pm

@@ -0,0 +1,63 @@
+package Hydra::Event::EvalCached;
+
+use strict;
+use warnings;
+
+sub parse :prototype(@) {
+    unless (@_ == 3) {
+        die "eval_cached: payload takes exactly three arguments, but ", scalar(@_), " were given";
+    }
+
+    my ($trace_id, $jobset_id, $evaluation_id) = @_;
+
+    unless ($jobset_id =~ /^\d+$/) {
+        die "eval_cached: payload argument jobset_id should be an integer, but '", $jobset_id, "' was given"
+    }
+    unless ($evaluation_id =~ /^\d+$/) {
+        die "eval_cached: payload argument evaluation_id should be an integer, but '", $evaluation_id, "' was given"
+    }
+
+    return Hydra::Event::EvalCached->new($trace_id, int($jobset_id), int($evaluation_id));
+}
+
+sub new {
+    my ($self, $trace_id, $jobset_id, $evaluation_id) = @_;
+    return bless {
+        "trace_id" => $trace_id,
+        "jobset_id" => $jobset_id,
+        "evaluation_id" => $evaluation_id,
+        "jobset" => undef,
+        "evaluation" => undef
+    }, $self;
+}
+
+sub interestedIn {
+    my ($self, $plugin) = @_;
+    return int(defined($plugin->can('evalCached')));
+}
+
+sub load {
+    my ($self, $db) = @_;
+
+    if (!defined($self->{"jobset"})) {
+        $self->{"jobset"} = $db->resultset('Jobsets')->find({ id => $self->{"jobset_id"}})
+            or die "Jobset $self->{'jobset_id'} does not exist\n";
+    }
+
+    if (!defined($self->{"evaluation"})) {
+        $self->{"evaluation"} = $db->resultset('JobsetEvals')->find({ id => $self->{"evaluation_id"}})
+            or die "Jobset $self->{'jobset_id'} does not exist\n";
+    }
+}
+
+sub execute {
+    my ($self, $db, $plugin) = @_;
+
+    $self->load($db);
+
+    $plugin->evalCached($self->{"trace_id"}, $self->{"jobset"}, $self->{"evaluation"});
+
+    return 1;
+}
+
+1;