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Short-circuit --head handler when count is reached

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This commit is contained in:
John Wiegley 2010-03-16 14:20:09 -04:00
parent 3e21a171c7
commit 2f9ea39869
2 changed files with 11 additions and 4 deletions
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8
src/filters.cc
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@ -107,6 +107,9 @@ void truncate_xacts::flush()
void truncate_xacts::operator()(post_t& post)
{
if (completed)
return;
if (last_xact != post.xact) {
if (last_xact)
xacts_seen++;
@ -114,8 +117,11 @@ void truncate_xacts::operator()(post_t& post)
}
if (tail_count == 0 && head_count > 0 &&
static_cast<int>(xacts_seen) >= head_count)
static_cast<int>(xacts_seen) >= head_count) {
flush();
completed = true;
return;
}
posts.push_back(&post);
}

7
src/filters.h
View file

@ -125,8 +125,9 @@ public:
class truncate_xacts : public item_handler<post_t>
{
int head_count;
int tail_count;
int head_count;
int tail_count;
bool completed;
posts_list posts;
std::size_t xacts_seen;
@ -139,7 +140,7 @@ public:
int _head_count, int _tail_count)
: item_handler<post_t>(handler),
head_count(_head_count), tail_count(_tail_count),
xacts_seen(0), last_xact(NULL) {
completed(false), xacts_seen(0), last_xact(NULL) {
TRACE_CTOR(truncate_xacts, "post_handler_ptr, int, int");
}
virtual ~truncate_xacts() {