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#ifndef WORKLOAD_GENERATOR_H
#define WORKLOAD_GENERATOR_H
#include "api_const.h"
#include "configuration_settings.h"
#include "random_generator.h"
#include "debug_utils.h"
#include "thread_manager.h"
namespace test_harness {
class workload_generator {
public:
workload_generator(configuration *configuration)
{
_configuration = configuration;
}
~workload_generator()
{
if (_session != nullptr) {
if (_session->close(_session, NULL) != 0)
/* Failing to close session is not blocking. */
debug_info(
"Failed to close session, shutting down uncleanly", _trace_level, DEBUG_ERROR);
_session = nullptr;
}
if (_conn != nullptr) {
if (_conn->close(_conn, NULL) != 0)
/* Failing to close connection is not blocking. */
debug_info(
"Failed to close connection, shutting down uncleanly", _trace_level, DEBUG_ERROR);
_conn = nullptr;
}
}
/*
* Function that performs the following steps using the configuration that is defined by the
* test:
* - Create the working dir.
* - Open a connection.
* - Open a session.
* - Create n collections as per the configuration.
* - Open a cursor on each collection.
* - Insert m key/value pairs in each collection. Values are random strings which size is
* defined by the configuration.
*/
int
load(const char *home = DEFAULT_DIR)
{
WT_CURSOR *cursor;
int64_t collection_count, key_count, value_size;
std::string collection_name;
cursor = nullptr;
collection_count = key_count = value_size = 0;
collection_name = "";
/* Create the working dir. */
testutil_make_work_dir(home);
/* Open connection. */
testutil_check(wiredtiger_open(home, NULL, CONNECTION_CREATE, &_conn));
/* Open session. */
testutil_check(_conn->open_session(_conn, NULL, NULL, &_session));
/* Create n collections as per the configuration and store each collection name. */
testutil_check(_configuration->get_int(COLLECTION_COUNT, collection_count));
for (int i = 0; i < collection_count; ++i) {
collection_name = "table:collection" + std::to_string(i);
testutil_check(
_session->create(_session, collection_name.c_str(), DEFAULT_TABLE_SCHEMA));
_collection_names.push_back(collection_name);
}
debug_info(
std::to_string(collection_count) + " collections created", _trace_level, DEBUG_INFO);
/* Open a cursor on each collection and use the configuration to insert key/value pairs. */
testutil_check(_configuration->get_int(KEY_COUNT, key_count));
testutil_check(_configuration->get_int(VALUE_SIZE, value_size));
for (const auto &collection_name : _collection_names) {
/* WiredTiger lets you open a cursor on a collection using the same pointer. When a
* session is closed, WiredTiger APIs close the cursors too. */
testutil_check(
_session->open_cursor(_session, collection_name.c_str(), NULL, NULL, &cursor));
for (size_t j = 0; j < key_count; ++j) {
cursor->set_key(cursor, j);
/* Generation of a random string value using the size defined in the test
* configuration. */
std::string generated_value =
random_generator::random_generator::get_instance().generate_string(value_size);
cursor->set_value(cursor, generated_value.c_str());
testutil_check(cursor->insert(cursor));
}
}
debug_info(
std::to_string(collection_count) + " key/value inserted", _trace_level, DEBUG_INFO);
debug_info("Load stage done", _trace_level, DEBUG_INFO);
return (0);
}
/* Do the work of the main part of the workload. */
int
run()
{
WT_SESSION *session;
int64_t duration_seconds, read_threads;
session = nullptr;
duration_seconds = read_threads = 0;
testutil_check(_configuration->get_int(DURATION_SECONDS, duration_seconds));
testutil_check(_configuration->get_int(READ_THREADS, read_threads));
/* Generate threads to execute read operations on the collections. */
for (int i = 0; i < read_threads; ++i) {
testutil_check(_conn->open_session(_conn, NULL, NULL, &session));
thread_context *tc =
new thread_context(session, _collection_names, thread_operation::READ);
_thread_manager.add_thread(tc, &execute_operation);
}
/*
* Spin until duration seconds has expired. If the call to run() returns we destroy the test
* and the workload generator.
*/
std::this_thread::sleep_for(std::chrono::seconds(duration_seconds));
_thread_manager.finish();
debug_info("Run stage done", _trace_level, DEBUG_INFO);
return 0;
}
/* Workload threaded operations. */
static void
execute_operation(thread_context &context)
{
thread_operation operation;
operation = context.get_thread_operation();
if (context.get_session() == nullptr) {
testutil_die(DEBUG_ABORT, "system: execute_operation : Session is NULL");
}
switch (operation) {
case thread_operation::INSERT:
/* Sleep until it is implemented. */
std::this_thread::sleep_for(std::chrono::seconds(1));
break;
case thread_operation::READ:
read_operation(context);
break;
case thread_operation::REMOVE:
/* Sleep until it is implemented. */
std::this_thread::sleep_for(std::chrono::seconds(1));
break;
case thread_operation::UPDATE:
/* Sleep until it is implemented. */
std::this_thread::sleep_for(std::chrono::seconds(1));
break;
default:
testutil_die(DEBUG_ABORT, "system: thread_operation is unknown : %d",
static_cast<int>(thread_operation::UPDATE));
break;
}
}
/* Basic read operation that walks a cursors across all collections. */
static void
read_operation(thread_context &context)
{
WT_CURSOR *cursor;
std::vector<WT_CURSOR *> cursors;
/* Get a cursor for each collection in collection_names. */
for (const auto &it : context.get_collection_names()) {
testutil_check(context.get_session()->open_cursor(
context.get_session(), it.c_str(), NULL, NULL, &cursor));
cursors.push_back(cursor);
}
while (context.is_running()) {
/* Walk each cursor. */
for (const auto &it : cursors)
it->next(it);
}
}
/* WiredTiger APIs wrappers for single operations. */
static int
insert(WT_CURSOR *cursor)
{
if (cursor == nullptr)
throw std::invalid_argument("Failed to call insert, invalid cursor");
return (cursor->insert(cursor));
}
static int
search(WT_CURSOR *cursor)
{
if (cursor == nullptr)
throw std::invalid_argument("Failed to call search, invalid cursor");
return (cursor->search(cursor));
}
static int
search_near(WT_CURSOR *cursor, int *exact)
{
if (cursor == nullptr)
throw std::invalid_argument("Failed to call search_near, invalid cursor");
return (cursor->search_near(cursor, exact));
}
static int
update(WT_CURSOR *cursor)
{
if (cursor == nullptr)
throw std::invalid_argument("Failed to call update, invalid cursor");
return (cursor->update(cursor));
}
private:
std::vector<std::string> _collection_names;
configuration *_configuration = nullptr;
WT_CONNECTION *_conn = nullptr;
WT_SESSION *_session = nullptr;
thread_manager _thread_manager;
};
} // namespace test_harness
#endif
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