sf_daq_buffer/core-buffer/test/test_FastQueue.cpp

#include "FastQueue.hpp"
#include "gtest/gtest.h"

using namespace core_buffer;

TEST(FastQueue, basic_interaction)
{
    size_t n_slots = 5;
    size_t slot_data_n_bytes = MODULE_N_BYTES * 2;
    FastQueue<DetectorFrame> queue(slot_data_n_bytes, n_slots);
    int slot_id;

    // The queue at the beginning should be empty.
    ASSERT_EQ(queue.read(), -1);
    // Cannot commit a slot until you reserve it.
    ASSERT_THROW(queue.commit(), runtime_error);
    // Cannot release a slot until its ready.
    ASSERT_THROW(queue.release(), runtime_error);

    // Reserve a slot.
    slot_id = queue.reserve();
    ASSERT_NE(slot_id, -1);
    // But you cannot reserve 2 slots at once.
    ASSERT_EQ(queue.reserve(), -1);
    // And cannot read this slot until its committed.
    ASSERT_EQ(queue.read(), -1);

    auto detector_frame = queue.get_metadata_buffer(slot_id);
    char* meta_ptr = (char*) detector_frame;
    char* data_ptr = (char*) queue.get_data_buffer(slot_id);

    queue.commit();

    slot_id = queue.read();
    // Once the slot is committed we should be able to read it.
    ASSERT_NE(slot_id, -1);
    // You can read the same slot multiple times.
    ASSERT_NE(queue.read(), -1);
    // The 2 buffers should match the committed slot.
    ASSERT_EQ(meta_ptr, (char*)(queue.get_metadata_buffer(slot_id)));
    ASSERT_EQ(data_ptr, (char*)(queue.get_data_buffer(slot_id)));

    queue.release();
}

TEST(FastQueue, queue_full)
{
    size_t n_slots = 5;
    size_t slot_data_n_bytes = MODULE_N_BYTES * 2;
    FastQueue<DetectorFrame> queue(slot_data_n_bytes, n_slots);

    // There is nothing to be read in the queue.
    ASSERT_EQ(queue.read(), -1);

    for (size_t i=0; i<n_slots; i++) {
        // Business as usual here, we still have slots left.
        ASSERT_NE(queue.reserve(), -1);
        queue.commit();
    }

    // There are no more slots available.
    ASSERT_EQ(queue.reserve(), -1);
    // We now read the first slot.
    ASSERT_EQ(queue.read(), 0);
    // But until we release it we cannot re-use it.
    ASSERT_EQ(queue.reserve(), -1);

    queue.release();
    // After the release, the first slot is again ready for writing.
    ASSERT_EQ(queue.reserve(), 0);
}

TEST(FastQueue, data_transfer)
{
    size_t n_slots = 5;
    size_t slot_data_n_bytes = MODULE_N_BYTES * 2;
    FastQueue<DetectorFrame> queue(slot_data_n_bytes, n_slots);

    int write_slot_id = queue.reserve();

    auto w_metadata = queue.get_metadata_buffer(write_slot_id);
    w_metadata->pulse_id = 1;
    w_metadata->frame_index = 2;
    w_metadata->daq_rec = 3;
    w_metadata->n_received_packets = 4;

    auto w_data = (uint16_t*)(queue.get_data_buffer(write_slot_id));
    for (size_t i=0; i<MODULE_N_PIXELS; i++) {
        w_data[i] = (uint16_t) i;
    }

    queue.commit();

    auto read_slot_id = queue.read();

    auto r_metadata = queue.get_metadata_buffer(read_slot_id);
    EXPECT_EQ(w_metadata->pulse_id, r_metadata->pulse_id);
    EXPECT_EQ(w_metadata->frame_index, r_metadata->frame_index);
    EXPECT_EQ(w_metadata->daq_rec, r_metadata->daq_rec);
    EXPECT_EQ(w_metadata->n_received_packets, r_metadata->n_received_packets);

    auto r_data = (uint16_t*)(queue.get_data_buffer(read_slot_id));
    for (size_t i=0; i<MODULE_N_PIXELS; i++) {
        ASSERT_EQ(r_data[i], (uint16_t) i);
    }
}