From 4f6f85dd8b0a2b2a9123408d78d346dfb039cecd Mon Sep 17 00:00:00 2001
From: Mike Taylor <mike@indexdata.com>
Date: Tue, 9 May 2006 16:21:37 +0000
Subject: [PATCH] Super-groovy asynchronicity, baby!

---
 test-pod.pl |   59 +++++++++++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 45 insertions(+), 14 deletions(-)

diff --git a/test-pod.pl b/test-pod.pl
index 5270aa5..3eb8535 100644
--- a/test-pod.pl
+++ b/test-pod.pl
@@ -1,9 +1,9 @@
 #!/usr/bin/perl -w
 
-# $Id: test-pod.pl,v 1.2 2006-05-09 12:09:44 mike Exp $
+# $Id: test-pod.pl,v 1.3 2006-05-09 16:21:37 mike Exp $
 #
 # Run like this:
-#	ZOOM_RECORD_NO_FORCE_SYNC=1 perl -I lib test-pod.pl
+#	ZOOM_RECORD_NO_FORCE_SYNC=1 YAZ_LOG=pod perl -I lib test-pod.pl
 # (at least until the default sync. behaviour of ZOOM-C changes.)
 
 use strict;
@@ -12,28 +12,59 @@ use warnings;
 use ZOOM::Pod;
 
 my $pod = new ZOOM::Pod("bagel.indexdata.com/gils",
-			"z3950.loc.gov:7090/Voyager",
-			"localhost:9999",
+			"bagel.indexdata.com/marc",
+			#"z3950.loc.gov:7090/Voyager",
+			#"localhost:9999",
 			);
+$pod->option(elementSetName => "b");
 $pod->callback(ZOOM::Event::RECV_SEARCH, \&completed_search);
 $pod->callback(ZOOM::Event::RECV_RECORD, \&got_record);
-$pod->search_pqf("mineral");
+$pod->search_pqf("the");
 my $err = $pod->wait();
-print "failed with error $err" if $err;
+die "$pod->wait() failed with error $err" if $err;
 
 sub completed_search {
-    my($conn, $rs, $event) = @_;
+    my($conn, $state, $rs, $event) = @_;
     print $conn->option("host"), ": found ", $rs->size(), " records\n";
-    my $rec = $rs->record(0);
-    print($conn->option("host"), ": rec(0) is ",
-	  defined $rec ? ("$rec = '", $rec->render(), "'") : "undefined",
-	  "\n");
+    $state->{next_to_fetch} = 0;
+    $state->{next_to_show} = 0;
+    request_record($conn, $rs, $state);
     return 0;
 }
 
 sub got_record {
-    my($conn, $rs, $event) = @_;
-    my $rec = $rs->record(0);
-    print $conn->option("host"), ": got 0: $rec = '", $rec->render(), "'\n";
+    my($conn, $state, $rs, $event) = @_;
+
+    {
+	# Sanity-checking assertions.  These should be impossible
+	my $ns = $state->{next_to_show};
+	my $nf = $state->{next_to_fetch};
+	if ($ns > $nf) {
+	    die "next_to_show > next_to_fetch ($ns > $nf)";
+	} elsif ($ns == $nf) {
+	    die "next_to_show == next_to_fetch ($ns)";
+	}
+    }
+
+    my $i = $state->{next_to_show}++;
+    my $rec = $rs->record($i);
+    print $conn->option("host"), ": record $i is ", render_record($rec), "\n";
+    request_record($conn, $rs, $state);
     return 0;
 }
+
+sub request_record {
+    my($conn, $rs, $state) = @_;
+
+    my $i = $state->{next_to_fetch}++;
+    my $rec = $rs->record($i);
+    print($conn->option("host"), ": pre-fetch: record $i is ",
+	  render_record($rec), "\n");
+}
+
+sub render_record {
+    my($rec) = @_;
+
+    return "undefined" if !defined $rec;
+    return "'" . $rec->render() . "'";
+}
-- 
1.7.10.4