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document_stream.h
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#ifndef SIMDJSON_INLINE_DOCUMENT_STREAM_H
#define SIMDJSON_INLINE_DOCUMENT_STREAM_H
#include "simdjson/dom/document_stream.h"
#include <algorithm>
#include <limits>
#include <stdexcept>
namespace simdjson {
namespace dom {
#ifdef SIMDJSON_THREADS_ENABLED
inline void stage1_worker::finish() {
std::unique_lock<std::mutex> lock(locking_mutex);
cond_var.wait(lock, [this]{return has_work == false;});
}
inline stage1_worker::~stage1_worker() {
stop_thread();
}
inline void stage1_worker::start_thread() {
std::unique_lock<std::mutex> lock(locking_mutex);
if(thread.joinable()) {
return; // This should never happen but we never want to create more than one thread.
}
thread = std::thread([this]{
while(can_work) {
std::unique_lock<std::mutex> thread_lock(locking_mutex);
cond_var.wait(thread_lock, [this]{return has_work || !can_work;});
if(!can_work) {
break;
}
this->owner->stage1_thread_error = this->owner->run_stage1(*this->stage1_thread_parser,
this->_next_batch_start);
this->has_work = false;
thread_lock.unlock();
cond_var.notify_one(); // will notify "finish"
}
}
);
}
inline void stage1_worker::stop_thread() {
std::unique_lock<std::mutex> lock(locking_mutex);
// We have to make sure that all locks can be released.
can_work = false;
has_work = false;
lock.unlock();
cond_var.notify_all();
if(thread.joinable()) {
thread.join();
}
}
inline void stage1_worker::run(document_stream * ds, dom::parser * stage1, size_t next_batch_start) {
std::unique_lock<std::mutex> lock(locking_mutex);
owner = ds;
_next_batch_start = next_batch_start;
stage1_thread_parser = stage1;
has_work = true;
lock.unlock();
cond_var.notify_one();// will notify the thread lock
}
#endif
really_inline document_stream::document_stream(
dom::parser &_parser,
const uint8_t *_buf,
size_t _len,
size_t _batch_size
) noexcept
: parser{&_parser},
buf{_buf},
len{_len},
batch_size{_batch_size},
error{SUCCESS}
{
#ifdef SIMDJSON_THREADS_ENABLED
if(worker.get() == nullptr) {
error = MEMALLOC;
}
#endif
}
really_inline document_stream::document_stream() noexcept
: parser{nullptr},
buf{nullptr},
len{0},
batch_size{0},
error{UNINITIALIZED} {
}
really_inline document_stream::~document_stream() noexcept {
}
really_inline document_stream::iterator document_stream::begin() noexcept {
start();
// If there are no documents, we're finished.
return iterator(*this, error == EMPTY);
}
really_inline document_stream::iterator document_stream::end() noexcept {
return iterator(*this, true);
}
really_inline document_stream::iterator::iterator(document_stream& _stream, bool is_end) noexcept
: stream{_stream}, finished{is_end} {
}
really_inline simdjson_result<element> document_stream::iterator::operator*() noexcept {
// Once we have yielded any errors, we're finished.
if (stream.error) { finished = true; return stream.error; }
return stream.parser->doc.root();
}
really_inline document_stream::iterator& document_stream::iterator::operator++() noexcept {
stream.next();
// If that was the last document, we're finished.
if (stream.error == EMPTY) { finished = true; }
return *this;
}
really_inline bool document_stream::iterator::operator!=(const document_stream::iterator &other) const noexcept {
return finished != other.finished;
}
inline void document_stream::start() noexcept {
if (error) { return; }
error = parser->ensure_capacity(batch_size);
if (error) { return; }
// Always run the first stage 1 parse immediately
batch_start = 0;
error = run_stage1(*parser, batch_start);
if (error) { return; }
#ifdef SIMDJSON_THREADS_ENABLED
if (next_batch_start() < len) {
// Kick off the first thread if needed
error = stage1_thread_parser.ensure_capacity(batch_size);
if (error) { return; }
worker->start_thread();
start_stage1_thread();
if (error) { return; }
}
#endif // SIMDJSON_THREADS_ENABLED
next();
}
really_inline size_t document_stream::iterator::current_index() const noexcept {
return stream.doc_index;
}
really_inline std::string_view document_stream::iterator::source() const noexcept {
size_t next_doc_index = stream.batch_start + stream.parser->implementation->structural_indexes[stream.parser->implementation->next_structural_index];
return std::string_view(reinterpret_cast<const char*>(stream.buf) + current_index(), next_doc_index - current_index() - 1);
}
inline void document_stream::next() noexcept {
if (error) { return; }
// Load the next document from the batch
doc_index = batch_start + parser->implementation->structural_indexes[parser->implementation->next_structural_index];
error = parser->implementation->stage2_next(parser->doc);
// If that was the last document in the batch, load another batch (if available)
while (error == EMPTY) {
batch_start = next_batch_start();
if (batch_start >= len) { break; }
#ifdef SIMDJSON_THREADS_ENABLED
load_from_stage1_thread();
#else
error = run_stage1(*parser, batch_start);
#endif
if (error) { continue; } // If the error was EMPTY, we may want to load another batch.
// Run stage 2 on the first document in the batch
doc_index = batch_start + parser->implementation->structural_indexes[parser->implementation->next_structural_index];
error = parser->implementation->stage2_next(parser->doc);
}
}
inline size_t document_stream::next_batch_start() const noexcept {
return batch_start + parser->implementation->structural_indexes[parser->implementation->n_structural_indexes];
}
inline error_code document_stream::run_stage1(dom::parser &p, size_t _batch_start) noexcept {
// If this is the final batch, pass partial = false
size_t remaining = len - _batch_start;
if (remaining <= batch_size) {
return p.implementation->stage1(&buf[_batch_start], remaining, false);
} else {
return p.implementation->stage1(&buf[_batch_start], batch_size, true);
}
}
#ifdef SIMDJSON_THREADS_ENABLED
inline void document_stream::load_from_stage1_thread() noexcept {
worker->finish();
// Swap to the parser that was loaded up in the thread. Make sure the parser has
// enough memory to swap to, as well.
std::swap(*parser, stage1_thread_parser);
error = stage1_thread_error;
if (error) { return; }
// If there's anything left, start the stage 1 thread!
if (next_batch_start() < len) {
start_stage1_thread();
}
}
inline void document_stream::start_stage1_thread() noexcept {
// we call the thread on a lambda that will update
// this->stage1_thread_error
// there is only one thread that may write to this value
// TODO this is NOT exception-safe.
this->stage1_thread_error = UNINITIALIZED; // In case something goes wrong, make sure it's an error
size_t _next_batch_start = this->next_batch_start();
worker->run(this, & this->stage1_thread_parser, _next_batch_start);
}
#endif // SIMDJSON_THREADS_ENABLED
} // namespace dom
really_inline simdjson_result<dom::document_stream>::simdjson_result() noexcept
: simdjson_result_base() {
}
really_inline simdjson_result<dom::document_stream>::simdjson_result(error_code error) noexcept
: simdjson_result_base(error) {
}
really_inline simdjson_result<dom::document_stream>::simdjson_result(dom::document_stream &&value) noexcept
: simdjson_result_base(std::forward<dom::document_stream>(value)) {
}
#if SIMDJSON_EXCEPTIONS
really_inline dom::document_stream::iterator simdjson_result<dom::document_stream>::begin() noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return first.begin();
}
really_inline dom::document_stream::iterator simdjson_result<dom::document_stream>::end() noexcept(false) {
if (error()) { throw simdjson_error(error()); }
return first.end();
}
#else // SIMDJSON_EXCEPTIONS
really_inline dom::document_stream::iterator simdjson_result<dom::document_stream>::begin() noexcept {
first.error = error();
return first.begin();
}
really_inline dom::document_stream::iterator simdjson_result<dom::document_stream>::end() noexcept {
first.error = error();
return first.end();
}
#endif // SIMDJSON_EXCEPTIONS
} // namespace simdjson
#endif // SIMDJSON_INLINE_DOCUMENT_STREAM_H