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/*
* Copyright (c) 2013, The Linux Foundation. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials provided
* with the distribution.
* * Neither the name of The Linux Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
* BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
* IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
package com.android.browser;
import android.app.ActivityManager;
import android.content.Context;
import java.sql.Timestamp;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
public class MemoryMonitor {
/**
* if number of tabs whose native tab is active, is greater
* than MAX_ACTIVE_TABS destroy the nativetab of oldest used Tab
*/
public static void purgeActiveTabs(Context context,
Controller controller,
BrowserSettings settings) {
if(!settings.enableMemoryMonitor())
return;
int maxActiveTabs = getMaxActiveTabs(context);
TabControl tabControl = controller.getTabControl();
ArrayList<Tab> activeTabList = new ArrayList<Tab>();
for (int i = 0; i < tabControl.getTabCount(); i++) {
Tab tab = tabControl.getTab(i);
if(tab.isNativeActive())
activeTabList.add(tab);
}
int numActiveTabsToRelease = activeTabList.size() - maxActiveTabs;
if(numActiveTabsToRelease < 1)
return;
// sort tabs in order of LRU first
Collections.sort(activeTabList, new Comparator<Tab>() {
@Override
public int compare(Tab tab1, Tab tab2) {
return tab1.getTimestamp().compareTo(tab2.getTimestamp());
}
});
for(int i = 0; i < numActiveTabsToRelease; i++) {
if(tabControl.getCurrentTab()!= activeTabList.get(i)) {
activeTabList.get(i).destroyThroughMemoryMonitor();
}
}
}
/**
* Returns the default max number of active tabs based on device's
* memory class.
*/
private static int getMaxActiveTabs(Context context) {
return context.getResources()
.getInteger(R.integer.feature_num_min_active_tabs);
}
}
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