Purge once random minutes(between 30min and 60min) after backgrounded.

chrome/browser/memory/tab_manager_unittest.cc

 // 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 "chrome/browser/memory/tab_manager.h"
 
 #include <algorithm>
 #include <map>
 #include <vector>
 
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/field_trial.h"
 #include "base/strings/string16.h"
 #include "base/test/mock_entropy_provider.h"
 #include "base/test/simple_test_tick_clock.h"
 #include "base/time/time.h"
 #include "build/build_config.h"
 #include "chrome/browser/memory/tab_manager_web_contents_data.h"
 #include "chrome/browser/memory/tab_stats.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/tabs/test_tab_strip_model_delegate.h"
 #include "chrome/common/chrome_features.h"
 #include "chrome/common/url_constants.h"
 #include "chrome/test/base/chrome_render_view_host_test_harness.h"
 #include "chrome/test/base/testing_profile.h"
 #include "components/variations/variations_associated_data.h"
+#include "content/public/browser/render_process_host.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/test/mock_render_process_host.h"
 #include "content/public/test/web_contents_tester.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "url/gurl.h"
 
 using content::WebContents;
 using content::WebContentsTester;
 
 namespace memory {
 namespace {
@@ skipping 624 matching lines @@
   EXPECT_FALSE(tm.under_memory_pressure_);
   EXPECT_EQ(0u, task_runner->size());
   EXPECT_EQ(0u, tm.notified_renderers_.size());
 
 
   // Clean up the tabstrip.
   tabstrip.CloseAllTabs();
   ASSERT_TRUE(tabstrip.empty());
 }
 
-TEST_F(TabManagerTest, NextPurgeAndSuspendState) {
+TEST_F(TabManagerTest, DefaultTimeToPurgeInCorrectRange) {
+  TabManager tab_manager;
+  base::TimeDelta time_to_purge =
+      tab_manager.GetTimeToPurge(TabManager::kDefaultMinTimeToPurge);
+  EXPECT_GE(time_to_purge, base::TimeDelta::FromMinutes(30));
+  EXPECT_LT(time_to_purge, base::TimeDelta::FromMinutes(60));
+}
+
+TEST_F(TabManagerTest, ShouldPurgeAtDefaultTime) {
   TabManager tab_manager;
   TabStripDummyDelegate delegate;
   TabStripModel tabstrip(&delegate, profile());
   tabstrip.AddObserver(&tab_manager);
 
   WebContents* test_contents = CreateWebContents();
   tabstrip.AppendWebContents(test_contents, false);
 
-  // Use default time-to-first-purge  defined in TabManager.
-  base::TimeDelta threshold = TabManager::kDefaultTimeToFirstPurge;
   base::SimpleTestTickClock test_clock;
+  tab_manager.set_test_tick_clock(&test_clock);
 
+  tab_manager.GetWebContentsData(test_contents)->set_is_purged(false);
   tab_manager.GetWebContentsData(test_contents)
-      ->SetPurgeAndSuspendState(TabManager::RUNNING);
+      ->SetLastInactiveTime(test_clock.NowTicks());
   tab_manager.GetWebContentsData(test_contents)
-      ->SetLastPurgeAndSuspendModifiedTimeForTesting(test_clock.NowTicks());
+      ->set_time_to_purge(base::TimeDelta::FromMinutes(1));
 
-  // Wait 30 minutes and verify that the tab is still RUNNING.
-  test_clock.Advance(base::TimeDelta::FromMinutes(30));
-  EXPECT_EQ(TabManager::RUNNING,
-            tab_manager.GetNextPurgeAndSuspendState(
-                test_contents, test_clock.NowTicks(), threshold));
+  // Wait 1 minute and verify that the tab is still not to be purged.
+  test_clock.Advance(base::TimeDelta::FromMinutes(1));
+  EXPECT_FALSE(tab_manager.ShouldPurgeNow(test_contents));
 
-  // Wait another second and verify that it is now SUSPENDED.
+  // Wait another 1 second and verify that it should be purged now .
   test_clock.Advance(base::TimeDelta::FromSeconds(1));
-  EXPECT_EQ(TabManager::SUSPENDED,
-            tab_manager.GetNextPurgeAndSuspendState(
-                test_contents, test_clock.NowTicks(), threshold));
+  EXPECT_TRUE(tab_manager.ShouldPurgeNow(test_contents));
 
+  tab_manager.GetWebContentsData(test_contents)->set_is_purged(true);
   tab_manager.GetWebContentsData(test_contents)
-      ->SetPurgeAndSuspendState(TabManager::SUSPENDED);
-  tab_manager.GetWebContentsData(test_contents)
-      ->SetLastPurgeAndSuspendModifiedTimeForTesting(test_clock.NowTicks());
+      ->SetLastInactiveTime(test_clock.NowTicks());
 
-  test_clock.Advance(base::TimeDelta::FromSeconds(1200));
-  EXPECT_EQ(TabManager::SUSPENDED,
-            tab_manager.GetNextPurgeAndSuspendState(
-                test_contents, test_clock.NowTicks(), threshold));
-
-  test_clock.Advance(base::TimeDelta::FromSeconds(1));
-  EXPECT_EQ(TabManager::RESUMED,
-            tab_manager.GetNextPurgeAndSuspendState(
-                test_contents, test_clock.NowTicks(), threshold));
-
-  tab_manager.GetWebContentsData(test_contents)
-      ->SetPurgeAndSuspendState(TabManager::RESUMED);
-  tab_manager.GetWebContentsData(test_contents)
-      ->SetLastPurgeAndSuspendModifiedTimeForTesting(test_clock.NowTicks());
-
-  test_clock.Advance(base::TimeDelta::FromSeconds(10));
-  EXPECT_EQ(TabManager::RESUMED,
-            tab_manager.GetNextPurgeAndSuspendState(
-                test_contents, test_clock.NowTicks(), threshold));
-
-  test_clock.Advance(base::TimeDelta::FromSeconds(1));
-  EXPECT_EQ(TabManager::SUSPENDED,
-            tab_manager.GetNextPurgeAndSuspendState(
-                test_contents, test_clock.NowTicks(), threshold));
-
-  // Clean up the tabstrip.
-  tabstrip.CloseAllTabs();
-  EXPECT_TRUE(tabstrip.empty());
+  // Wait 1 day and verify that the tab is still be purged.
+  test_clock.Advance(base::TimeDelta::FromHours(24));
+  EXPECT_FALSE(tab_manager.ShouldPurgeNow(test_contents));
 }
 
-TEST_F(TabManagerTest, ActivateTabResetPurgeAndSuspendState) {
+TEST_F(TabManagerTest, ActivateTabResetPurgeState) {
   TabManager tab_manager;
   TabStripDummyDelegate delegate;
   TabStripModel tabstrip(&delegate, profile());
   tabstrip.AddObserver(&tab_manager);
+  tab_manager.test_tab_strip_models_.push_back(
+      TabManager::TestTabStripModel(&tabstrip, false /* !is_app */));
+
+  base::SimpleTestTickClock test_clock;
+  tab_manager.set_test_tick_clock(&test_clock);
 
   WebContents* tab1 = CreateWebContents();
   WebContents* tab2 = CreateWebContents();
   tabstrip.AppendWebContents(tab1, true);
   tabstrip.AppendWebContents(tab2, false);
 
-  base::SimpleTestTickClock test_clock;
+  tab_manager.GetWebContentsData(tab2)->SetLastInactiveTime(
+      test_clock.NowTicks());
+  static_cast<content::MockRenderProcessHost*>(tab2->GetRenderProcessHost())
+      ->set_is_process_backgrounded(true);
+  EXPECT_TRUE(tab2->GetRenderProcessHost()->IsProcessBackgrounded());
 
-  // Initially PurgeAndSuspend state should be RUNNING.
-  EXPECT_EQ(TabManager::RUNNING,
-            tab_manager.GetWebContentsData(tab2)->GetPurgeAndSuspendState());
+  // Initially PurgeAndSuspend state should be NOT_PURGED.
+  EXPECT_FALSE(tab_manager.GetWebContentsData(tab2)->is_purged());
+  tab_manager.GetWebContentsData(tab2)->set_time_to_purge(
+      base::TimeDelta::FromMinutes(1));
+  test_clock.Advance(base::TimeDelta::FromMinutes(2));
+  tab_manager.PurgeBackgroundedTabsIfNeeded();
+  // Since tab2 is kept inactive and background for more than time-to-purge,
+  // tab2 should be purged.
+  EXPECT_TRUE(tab_manager.GetWebContentsData(tab2)->is_purged());
 
-  tab_manager.GetWebContentsData(tab2)->SetPurgeAndSuspendState(
-      TabManager::SUSPENDED);
-  tab_manager.GetWebContentsData(tab2)
-      ->SetLastPurgeAndSuspendModifiedTimeForTesting(test_clock.NowTicks());
-
-  // Activate tab2. Tab2's PurgeAndSuspend state should be RUNNING.
+  // Activate tab2. Tab2's PurgeAndSuspend state should be NOT_PURGED.
   tabstrip.ActivateTabAt(1, true /* user_gesture */);
-  EXPECT_EQ(TabManager::RUNNING,
-            tab_manager.GetWebContentsData(tab2)->GetPurgeAndSuspendState());
-
-  tab_manager.GetWebContentsData(tab1)->SetPurgeAndSuspendState(
-      TabManager::RESUMED);
-  tab_manager.GetWebContentsData(tab1)
-      ->SetLastPurgeAndSuspendModifiedTimeForTesting(test_clock.NowTicks());
-
-  // Activate tab1. Tab1's PurgeAndSuspend state should be RUNNING.
-  tabstrip.ActivateTabAt(0, true /* user_gesture */);
-  EXPECT_EQ(TabManager::RUNNING,
-            tab_manager.GetWebContentsData(tab1)->GetPurgeAndSuspendState());
-
-  // Clean up the tabstrip.
-  tabstrip.CloseAllTabs();
-  EXPECT_TRUE(tabstrip.empty());
+  EXPECT_FALSE(tab_manager.GetWebContentsData(tab2)->is_purged());
 }
 
 }  // namespace memory