54 lines
1.7 KiB
Java
54 lines
1.7 KiB
Java
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import java.util.Comparator;
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/**
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* Ranks classes for preloading based on how long their operations took
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* and how early the operations happened. Higher ranked classes come first.
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*/
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class ClassRank implements Comparator<Operation> {
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/**
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* Increase this number to add more weight to classes which were loaded
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* earlier.
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*/
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static final int SEQUENCE_WEIGHT = 500; // 5 ms
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static final int BUCKET_SIZE = 5;
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public int compare(Operation a, Operation b) {
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// Higher ranked operations should come first.
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int result = rankOf(b) - rankOf(a);
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if (result != 0) {
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return result;
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}
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// Make sure we don't drop one of two classes w/ the same rank.
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// If a load and an initialization have the same rank, it's OK
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// to treat the operations equally.
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return a.loadedClass.name.compareTo(b.loadedClass.name);
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}
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/** Ranks the given operation. */
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private static int rankOf(Operation o) {
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return o.medianExclusiveTimeMicros()
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+ SEQUENCE_WEIGHT / (o.index / BUCKET_SIZE + 1);
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}
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}
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