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225 rivejä
6.5 KiB
225 rivejä
6.5 KiB
// Copyright (c) 2011 The LevelDB Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file. See the AUTHORS file for names of contributors.
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#include "leveldb/env.h"
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#include <algorithm>
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#include <atomic>
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#include "port/port.h"
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#include "port/thread_annotations.h"
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#include "util/mutexlock.h"
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#include "util/testharness.h"
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#include "util/testutil.h"
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namespace leveldb {
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static const int kDelayMicros = 100000;
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class EnvTest {
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public:
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EnvTest() : env_(Env::Default()) {}
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Env* env_;
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};
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namespace {
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static void SetAtomicBool(void* atomic_bool_ptr) {
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std::atomic<bool>* atomic_bool =
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reinterpret_cast<std::atomic<bool>*>(atomic_bool_ptr);
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atomic_bool->store(true, std::memory_order_relaxed);
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}
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} // namespace
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TEST(EnvTest, ReadWrite) {
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Random rnd(test::RandomSeed());
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// Get file to use for testing.
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std::string test_dir;
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ASSERT_OK(env_->GetTestDirectory(&test_dir));
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std::string test_file_name = test_dir + "/open_on_read.txt";
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WritableFile* writable_file;
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ASSERT_OK(env_->NewWritableFile(test_file_name, &writable_file));
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// Fill a file with data generated via a sequence of randomly sized writes.
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static const size_t kDataSize = 10 * 1048576;
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std::string data;
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while (data.size() < kDataSize) {
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int len = rnd.Skewed(18); // Up to 2^18 - 1, but typically much smaller
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std::string r;
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test::RandomString(&rnd, len, &r);
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ASSERT_OK(writable_file->Append(r));
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data += r;
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if (rnd.OneIn(10)) {
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ASSERT_OK(writable_file->Flush());
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}
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}
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ASSERT_OK(writable_file->Sync());
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ASSERT_OK(writable_file->Close());
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delete writable_file;
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// Read all data using a sequence of randomly sized reads.
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SequentialFile* sequential_file;
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ASSERT_OK(env_->NewSequentialFile(test_file_name, &sequential_file));
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std::string read_result;
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std::string scratch;
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while (read_result.size() < data.size()) {
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int len = std::min<int>(rnd.Skewed(18), data.size() - read_result.size());
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scratch.resize(std::max(len, 1)); // at least 1 so &scratch[0] is legal
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Slice read;
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ASSERT_OK(sequential_file->Read(len, &read, &scratch[0]));
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if (len > 0) {
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ASSERT_GT(read.size(), 0);
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}
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ASSERT_LE(read.size(), len);
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read_result.append(read.data(), read.size());
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}
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ASSERT_EQ(read_result, data);
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delete sequential_file;
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}
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TEST(EnvTest, RunImmediately) {
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std::atomic<bool> called(false);
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env_->Schedule(&SetAtomicBool, &called);
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env_->SleepForMicroseconds(kDelayMicros);
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ASSERT_TRUE(called.load(std::memory_order_relaxed));
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}
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TEST(EnvTest, RunMany) {
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std::atomic<int> last_id(0);
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struct Callback {
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std::atomic<int>* const last_id_ptr_; // Pointer to shared state.
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const int id_; // Order# for the execution of this callback.
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Callback(std::atomic<int>* last_id_ptr, int id)
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: last_id_ptr_(last_id_ptr), id_(id) {}
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static void Run(void* arg) {
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Callback* callback = reinterpret_cast<Callback*>(arg);
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int current_id = callback->last_id_ptr_->load(std::memory_order_relaxed);
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ASSERT_EQ(callback->id_ - 1, current_id);
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callback->last_id_ptr_->store(callback->id_, std::memory_order_relaxed);
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}
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};
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Callback callback1(&last_id, 1);
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Callback callback2(&last_id, 2);
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Callback callback3(&last_id, 3);
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Callback callback4(&last_id, 4);
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env_->Schedule(&Callback::Run, &callback1);
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env_->Schedule(&Callback::Run, &callback2);
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env_->Schedule(&Callback::Run, &callback3);
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env_->Schedule(&Callback::Run, &callback4);
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env_->SleepForMicroseconds(kDelayMicros);
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ASSERT_EQ(4, last_id.load(std::memory_order_relaxed));
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}
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struct State {
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port::Mutex mu;
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int val GUARDED_BY(mu);
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int num_running GUARDED_BY(mu);
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State(int val, int num_running) : val(val), num_running(num_running) {}
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};
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static void ThreadBody(void* arg) {
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State* s = reinterpret_cast<State*>(arg);
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s->mu.Lock();
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s->val += 1;
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s->num_running -= 1;
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s->mu.Unlock();
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}
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TEST(EnvTest, StartThread) {
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State state(0, 3);
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for (int i = 0; i < 3; i++) {
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env_->StartThread(&ThreadBody, &state);
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}
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while (true) {
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state.mu.Lock();
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int num = state.num_running;
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state.mu.Unlock();
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if (num == 0) {
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break;
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}
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env_->SleepForMicroseconds(kDelayMicros);
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}
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MutexLock l(&state.mu);
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ASSERT_EQ(state.val, 3);
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}
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TEST(EnvTest, TestOpenNonExistentFile) {
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// Write some test data to a single file that will be opened |n| times.
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std::string test_dir;
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ASSERT_OK(env_->GetTestDirectory(&test_dir));
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std::string non_existent_file = test_dir + "/non_existent_file";
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ASSERT_TRUE(!env_->FileExists(non_existent_file));
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RandomAccessFile* random_access_file;
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Status status =
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env_->NewRandomAccessFile(non_existent_file, &random_access_file);
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ASSERT_TRUE(status.IsNotFound());
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SequentialFile* sequential_file;
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status = env_->NewSequentialFile(non_existent_file, &sequential_file);
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ASSERT_TRUE(status.IsNotFound());
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}
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TEST(EnvTest, ReopenWritableFile) {
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std::string test_dir;
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ASSERT_OK(env_->GetTestDirectory(&test_dir));
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std::string test_file_name = test_dir + "/reopen_writable_file.txt";
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env_->DeleteFile(test_file_name);
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WritableFile* writable_file;
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ASSERT_OK(env_->NewWritableFile(test_file_name, &writable_file));
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std::string data("hello world!");
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ASSERT_OK(writable_file->Append(data));
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ASSERT_OK(writable_file->Close());
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delete writable_file;
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ASSERT_OK(env_->NewWritableFile(test_file_name, &writable_file));
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data = "42";
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ASSERT_OK(writable_file->Append(data));
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ASSERT_OK(writable_file->Close());
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delete writable_file;
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ASSERT_OK(ReadFileToString(env_, test_file_name, &data));
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ASSERT_EQ(std::string("42"), data);
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env_->DeleteFile(test_file_name);
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}
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TEST(EnvTest, ReopenAppendableFile) {
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std::string test_dir;
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ASSERT_OK(env_->GetTestDirectory(&test_dir));
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std::string test_file_name = test_dir + "/reopen_appendable_file.txt";
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env_->DeleteFile(test_file_name);
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WritableFile* appendable_file;
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ASSERT_OK(env_->NewAppendableFile(test_file_name, &appendable_file));
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std::string data("hello world!");
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ASSERT_OK(appendable_file->Append(data));
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ASSERT_OK(appendable_file->Close());
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delete appendable_file;
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ASSERT_OK(env_->NewAppendableFile(test_file_name, &appendable_file));
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data = "42";
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ASSERT_OK(appendable_file->Append(data));
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ASSERT_OK(appendable_file->Close());
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delete appendable_file;
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ASSERT_OK(ReadFileToString(env_, test_file_name, &data));
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ASSERT_EQ(std::string("hello world!42"), data);
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env_->DeleteFile(test_file_name);
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}
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} // namespace leveldb
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int main(int argc, char** argv) { return leveldb::test::RunAllTests(); }
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