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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <vespa/vespalib/testkit/testapp.h>
#include <vespa/vespalib/stllike/string.h>
#include <vespa/searchlib/util/bufferwriter.h>
#include <vespa/searchlib/util/drainingbufferwriter.h>
#include <vespa/vespalib/util/rand48.h>
namespace search {
namespace {
class StoreBufferWriter : public BufferWriter
{
std::vector<char> _buf;
std::vector<std::unique_ptr<std::vector<char> > > _bufs;
size_t _bytesWritten;
uint32_t _incompleteBuffers;
public:
static constexpr size_t BUFFER_SIZE = 262144;
StoreBufferWriter();
~StoreBufferWriter();
void flush() override;
size_t getBytesWritten() const { return _bytesWritten; }
std::vector<char> getSingleBuffer() const;
};
StoreBufferWriter::StoreBufferWriter()
: BufferWriter(),
_buf(),
_bytesWritten(0),
_incompleteBuffers(0)
{
_buf.resize(BUFFER_SIZE);
setup(&_buf[0], _buf.size());
}
StoreBufferWriter::~StoreBufferWriter() = default;
void
StoreBufferWriter::flush() {
assert(_incompleteBuffers == 0); // all previous buffers must have been full
size_t nowLen = usedLen();
if (nowLen != _buf.size()) {
// buffer is not full, only allowed for last buffer
++_incompleteBuffers;
}
if (nowLen == 0) {
return; // empty buffer
}
_bufs.emplace_back(std::make_unique<std::vector<char>>());
_bufs.back()->resize(BUFFER_SIZE);
_buf.resize(nowLen);
_bufs.back()->swap(_buf);
_bytesWritten += nowLen;
setup(&_buf[0], _buf.size());
}
std::vector<char>
StoreBufferWriter::getSingleBuffer() const
{
std::vector<char> res;
size_t needSize = 0;
for (const auto &buf : _bufs) {
needSize += buf->size();
}
res.reserve(needSize);
for (const auto &buf : _bufs) {
res.insert(res.end(), buf->cbegin(), buf->cend());
}
return res;
}
}
TEST("Test that bufferwriter works with no writes")
{
DrainingBufferWriter writer;
writer.flush();
EXPECT_EQUAL(0u, writer.getBytesWritten());
}
TEST("Test that bufferwriter works with single byte write")
{
DrainingBufferWriter writer;
char a = 4;
writer.write(&a, sizeof(a));
writer.flush();
EXPECT_EQUAL(1u, writer.getBytesWritten());
}
TEST("Test that bufferwriter works with multiple writes")
{
DrainingBufferWriter writer;
char a = 4;
int16_t b = 5;
int32_t c = 6;
writer.write(&a, sizeof(a));
writer.write(&b, sizeof(b));
writer.write(&c, sizeof(c));
writer.flush();
EXPECT_EQUAL(7u, writer.getBytesWritten());
}
TEST("Test that bufferwriter works with long writes")
{
std::vector<char> a;
const size_t mysize = 10000000;
const size_t drainerBufferSize = DrainingBufferWriter::BUFFER_SIZE;
EXPECT_GREATER(mysize, drainerBufferSize);
a.resize(mysize);
DrainingBufferWriter writer;
writer.write(&a[0], a.size());
writer.flush();
EXPECT_EQUAL(a.size(), writer.getBytesWritten());
}
TEST("Test that bufferwriter passes on written data")
{
std::vector<int> a;
const size_t mysize = 25000000;
const size_t drainerBufferSize = DrainingBufferWriter::BUFFER_SIZE;
EXPECT_GREATER(mysize * sizeof(int), drainerBufferSize);
a.reserve(mysize);
vespalib::Rand48 rnd;
for (uint32_t i = 0; i < mysize; ++i) {
a.emplace_back(rnd.lrand48());
}
StoreBufferWriter writer;
writer.write(&a[0], a.size() * sizeof(int));
writer.flush();
EXPECT_EQUAL(a.size() * sizeof(int), writer.getBytesWritten());
std::vector<char> written = writer.getSingleBuffer();
EXPECT_EQUAL(a.size() * sizeof(int), written.size());
EXPECT_TRUE(memcmp(&a[0], &written[0], written.size()) == 0);
}
}
TEST_MAIN()
{
TEST_RUN_ALL();
}
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