Rename OS-specific MemoryPressureMonitor implementations.

base/chromeos/memory_pressure_monitor_chromeos_unittest.cc

-// Copyright 2014 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 "base/basictypes.h"
-#include "base/chromeos/memory_pressure_monitor_chromeos.h"
-#include "base/memory/memory_pressure_listener.h"
-#include "base/message_loop/message_loop.h"
-#include "testing/gtest/include/gtest/gtest.h"
-
-namespace base {
-
-namespace {
-
-// True if the memory notifier got called.
-// Do not read/modify value directly.
-bool on_memory_pressure_called = false;
-
-// If the memory notifier got called, this is the memory pressure reported.
-MemoryPressureListener::MemoryPressureLevel on_memory_pressure_level =
-    MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE;
-
-// Processes OnMemoryPressure calls.
-void OnMemoryPressure(MemoryPressureListener::MemoryPressureLevel level) {
-  on_memory_pressure_called = true;
-  on_memory_pressure_level = level;
-}
-
-// Resets the indicator for memory pressure.
-void ResetOnMemoryPressureCalled() {
-  on_memory_pressure_called = false;
-}
-
-// Returns true when OnMemoryPressure was called (and resets it).
-bool WasOnMemoryPressureCalled() {
-  bool b = on_memory_pressure_called;
-  ResetOnMemoryPressureCalled();
-  return b;
-}
-
-}  // namespace
-
-class TestMemoryPressureMonitor : public MemoryPressureMonitorChromeOS {
- public:
-  TestMemoryPressureMonitor() :
-    MemoryPressureMonitorChromeOS(
-        MemoryPressureMonitorChromeOS::THRESHOLD_DEFAULT),
-    memory_in_percent_override_(0) {
-    // Disable any timers which are going on and set a special memory reporting
-    // function.
-    StopObserving();
-  }
-  ~TestMemoryPressureMonitor() override {}
-
-  void SetMemoryInPercentOverride(int percent) {
-    memory_in_percent_override_ = percent;
-  }
-
-  void CheckMemoryPressureForTest() {
-    CheckMemoryPressure();
-  }
-
- private:
-  int GetUsedMemoryInPercent() override {
-    return memory_in_percent_override_;
-  }
-
-  int memory_in_percent_override_;
-  DISALLOW_COPY_AND_ASSIGN(TestMemoryPressureMonitor);
-};
-
-// This test tests the various transition states from memory pressure, looking
-// for the correct behavior on event reposting as well as state updates.
-TEST(MemoryPressureMonitorChromeOSTest, CheckMemoryPressure) {
-  base::MessageLoopForUI message_loop;
-  scoped_ptr<TestMemoryPressureMonitor> monitor(
-      new TestMemoryPressureMonitor);
-  scoped_ptr<MemoryPressureListener> listener(
-      new MemoryPressureListener(base::Bind(&OnMemoryPressure)));
-  // Checking the memory pressure while 0% are used should not produce any
-  // events.
-  monitor->SetMemoryInPercentOverride(0);
-  ResetOnMemoryPressureCalled();
-
-  monitor->CheckMemoryPressureForTest();
-  message_loop.RunUntilIdle();
-  EXPECT_FALSE(WasOnMemoryPressureCalled());
-  EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_NONE,
-            monitor->GetCurrentPressureLevel());
-
-  // Setting the memory level to 80% should produce a moderate pressure level.
-  monitor->SetMemoryInPercentOverride(80);
-  monitor->CheckMemoryPressureForTest();
-  message_loop.RunUntilIdle();
-  EXPECT_TRUE(WasOnMemoryPressureCalled());
-  EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
-            monitor->GetCurrentPressureLevel());
-  EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
-            on_memory_pressure_level);
-
-  // We need to check that the event gets reposted after a while.
-  int i = 0;
-  for (; i < 100; i++) {
-    monitor->CheckMemoryPressureForTest();
-    message_loop.RunUntilIdle();
-    EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
-              monitor->GetCurrentPressureLevel());
-    if (WasOnMemoryPressureCalled()) {
-      EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
-                on_memory_pressure_level);
-      break;
-    }
-  }
-  // Should be more then 5 and less then 100.
-  EXPECT_LE(5, i);
-  EXPECT_GE(99, i);
-
-  // Setting the memory usage to 99% should produce critical levels.
-  monitor->SetMemoryInPercentOverride(99);
-  monitor->CheckMemoryPressureForTest();
-  message_loop.RunUntilIdle();
-  EXPECT_TRUE(WasOnMemoryPressureCalled());
-  EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL,
-            on_memory_pressure_level);
-  EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL,
-            monitor->GetCurrentPressureLevel());
-
-  // Calling it again should immediately produce a second call.
-  monitor->CheckMemoryPressureForTest();
-  message_loop.RunUntilIdle();
-  EXPECT_TRUE(WasOnMemoryPressureCalled());
-  EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL,
-            on_memory_pressure_level);
-  EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_CRITICAL,
-            monitor->GetCurrentPressureLevel());
-
-  // When lowering the pressure again we should not get an event, but the
-  // pressure should go back to moderate.
-  monitor->SetMemoryInPercentOverride(80);
-  monitor->CheckMemoryPressureForTest();
-  message_loop.RunUntilIdle();
-  EXPECT_FALSE(WasOnMemoryPressureCalled());
-  EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
-            monitor->GetCurrentPressureLevel());
-
-  // We should need exactly the same amount of calls as before, before the next
-  // call comes in.
-  int j = 0;
-  for (; j < 100; j++) {
-    monitor->CheckMemoryPressureForTest();
-    message_loop.RunUntilIdle();
-    EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
-              monitor->GetCurrentPressureLevel());
-    if (WasOnMemoryPressureCalled()) {
-      EXPECT_EQ(MemoryPressureListener::MEMORY_PRESSURE_LEVEL_MODERATE,
-                on_memory_pressure_level);
-      break;
-    }
-  }
-  // We should have needed exactly the same amount of checks as before.
-  EXPECT_EQ(j, i);
-}
-
-}  // namespace base