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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/data/memorydatastore.h>
#include <vespa/vespalib/util/array.hpp>
namespace vespalib {
using alloc::Alloc;
using LockGuard = std::lock_guard<std::mutex>;
MemoryDataStore::MemoryDataStore(Alloc && initialAlloc, std::mutex * lock)
: _buffers(),
_writePos(0),
_lock(lock)
{
_buffers.reserve(24);
_buffers.emplace_back(std::move(initialAlloc));
}
MemoryDataStore::~MemoryDataStore() = default;
MemoryDataStore::Reference
MemoryDataStore::push_back(const void * data, const size_t sz)
{
std::unique_ptr<LockGuard> guard;
if (_lock != nullptr) {
guard = std::make_unique<LockGuard>(*_lock);
}
const Alloc & b = _buffers.back();
if ((sz + _writePos) > b.size()) {
size_t newSize(std::max(sz, _buffers.back().size()*2));
_buffers.emplace_back(b.create(newSize));
_writePos = 0;
}
Alloc & buf = _buffers.back();
Reference ref(static_cast<char *>(buf.get()) + _writePos);
_writePos += sz;
guard.reset();
if (sz > 0) {
memcpy(ref.data(), data, sz);
}
return ref;
}
} // namespace vespalib
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