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[RocksDB] Expose count for WriteBatch

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Summary: As title. Exposed a Count function that returns the number of updates in a batch. Could be handy for replication sequence number check.

Test Plan: make check;

Reviewers: emayanke, sheki, dhruba

CC: leveldb

Differential Revision: https://reviews.facebook.net/D11523
This commit is contained in:
Haobo Xu 2013-06-26 10:50:58 -07:00
parent 34ef873290
commit 71e0f695c1
3 changed files with 14 additions and 1 deletions
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4
db/write_batch.cc
View File

@ -45,6 +45,10 @@ void WriteBatch::Clear() {
rep_.resize(kHeader);
}
int WriteBatch::Count() const {
return WriteBatchInternal::Count(this);
}
Status WriteBatch::Iterate(Handler* handler) const {
Slice input(rep_);
if (input.size() < kHeader) {

6
db/write_batch_test.cc
View File

@ -67,6 +67,7 @@ TEST(WriteBatchTest, Empty) {
WriteBatch batch;
ASSERT_EQ("", PrintContents(&batch));
ASSERT_EQ(0, WriteBatchInternal::Count(&batch));
ASSERT_EQ(0, batch.Count());
}
TEST(WriteBatchTest, Multiple) {
@ -81,6 +82,7 @@ TEST(WriteBatchTest, Multiple) {
"Delete(box)@101"
"Put(foo, bar)@100",
PrintContents(&batch));
ASSERT_EQ(3, batch.Count());
}
TEST(WriteBatchTest, Corruption) {
@ -103,16 +105,19 @@ TEST(WriteBatchTest, Append) {
WriteBatchInternal::Append(&b1, &b2);
ASSERT_EQ("",
PrintContents(&b1));
ASSERT_EQ(0, b1.Count());
b2.Put("a", "va");
WriteBatchInternal::Append(&b1, &b2);
ASSERT_EQ("Put(a, va)@200",
PrintContents(&b1));
ASSERT_EQ(1, b1.Count());
b2.Clear();
b2.Put("b", "vb");
WriteBatchInternal::Append(&b1, &b2);
ASSERT_EQ("Put(a, va)@200"
"Put(b, vb)@201",
PrintContents(&b1));
ASSERT_EQ(2, b1.Count());
b2.Delete("foo");
WriteBatchInternal::Append(&b1, &b2);
ASSERT_EQ("Put(a, va)@200"
@ -120,6 +125,7 @@ TEST(WriteBatchTest, Append) {
"Put(b, vb)@201"
"Delete(foo)@203",
PrintContents(&b1));
ASSERT_EQ(4, b1.Count());
}
} // namespace leveldb

5
include/leveldb/write_batch.h
View File

@ -59,9 +59,12 @@ class WriteBatch {
};
Status Iterate(Handler* handler) const;
// Retrive the serialized version of this batch.
// Retrieve the serialized version of this batch.
std::string Data() { return rep_; }
// Returns the number of updates in the batch
int Count() const;
// Constructor with a serialized string object
WriteBatch(std::string rep): rep_(rep) {}