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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.android.ddmuilib.heap;
import com.android.ddmlib.NativeAllocationInfo;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
/**
* Models a heap snapshot that is the difference between two snapshots.
*/
public class NativeHeapDiffSnapshot extends NativeHeapSnapshot {
private long mCommonAllocationsTotalMemory;
public NativeHeapDiffSnapshot(NativeHeapSnapshot newSnapshot, NativeHeapSnapshot oldSnapshot) {
// The diff snapshots behaves like a snapshot that only contains the new allocations
// not present in the old snapshot
super(getNewAllocations(newSnapshot, oldSnapshot));
Set<NativeAllocationInfo> commonAllocations =
new HashSet<NativeAllocationInfo>(oldSnapshot.getAllocations());
commonAllocations.retainAll(newSnapshot.getAllocations());
// Memory common between the old and new snapshots
mCommonAllocationsTotalMemory = getTotalMemory(commonAllocations);
}
private static List<NativeAllocationInfo> getNewAllocations(NativeHeapSnapshot newSnapshot,
NativeHeapSnapshot oldSnapshot) {
Set<NativeAllocationInfo> allocations =
new HashSet<NativeAllocationInfo>(newSnapshot.getAllocations());
allocations.removeAll(oldSnapshot.getAllocations());
return new ArrayList<NativeAllocationInfo>(allocations);
}
@Override
public String getFormattedMemorySize() {
// for a diff snapshot, we report the following string for display:
// xxx bytes new allocation + yyy bytes retained from previous allocation
// = zzz bytes total
long newAllocations = getTotalSize();
return String.format("%s bytes new + %s bytes retained = %s bytes total",
formatMemorySize(newAllocations),
formatMemorySize(mCommonAllocationsTotalMemory),
formatMemorySize(newAllocations + mCommonAllocationsTotalMemory));
}
}
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