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