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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <string>
#include "base/files/file_path.h"
#include "base/message_loop/message_loop.h"
#include "base/timer/timer.h"
#include "base/tuple.h"
#include "build/build_config.h"
// Re-creates a given test file inside the cache test folder.
bool CreateCacheTestFile(const base::FilePath& name);
// Deletes all file son the cache.
bool DeleteCache(const base::FilePath& path);
// Fills buffer with random values (may contain nulls unless no_nulls is true).
void CacheTestFillBuffer(char* buffer, size_t len, bool no_nulls);
// Generates a random key of up to 200 bytes.
std::string GenerateKey(bool same_length);
// Returns true if the cache is not corrupt.
bool CheckCacheIntegrity(const base::FilePath& path, bool new_eviction,
uint32 mask);
// -----------------------------------------------------------------------
// Simple helper to deal with the message loop on a test.
class MessageLoopHelper {
// Run the message loop and wait for num_callbacks before returning. Returns
// false if we are waiting to long. Each callback that will be waited on is
// required to call CallbackWasCalled() to indicate when it was called.
bool WaitUntilCacheIoFinished(int num_callbacks);
// True if a given callback was called more times than it expected.
bool callback_reused_error() const { return callback_reused_error_; }
void set_callback_reused_error(bool error) {
callback_reused_error_ = error;
int callbacks_called() const { return callbacks_called_; }
// Report that a callback was called. Each callback that will be waited on
// via WaitUntilCacheIoFinished() is expected to call this method to
// indicate when it has been executed.
void CallbackWasCalled() { ++callbacks_called_; }
// Sets the number of callbacks that can be received so far.
void ExpectCallbacks(int num_callbacks) {
num_callbacks_ = num_callbacks;
num_iterations_ = last_ = 0;
completed_ = false;
// Called periodically to test if WaitUntilCacheIoFinished should return.
void TimerExpired();
base::RepeatingTimer<MessageLoopHelper> timer_;
int num_callbacks_;
int num_iterations_;
int last_;
bool completed_;
// True if a callback was called/reused more than expected.
bool callback_reused_error_;
int callbacks_called_;
// -----------------------------------------------------------------------
// Simple callback to process IO completions from the cache. It allows tests
// with multiple simultaneous IO operations.
class CallbackTest {
// Creates a new CallbackTest object. When the callback is called, it will
// update |helper|. If |reuse| is false and a callback is called more than
// once, or if |reuse| is true and a callback is called more than twice, an
// error will be reported to |helper|.
CallbackTest(MessageLoopHelper* helper, bool reuse);
void Run(int result);
int last_result() const { return last_result_; }
MessageLoopHelper* helper_;
int reuse_;
int last_result_;