| /* |
| * Copyright (c) 2013, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package org.graalvm.compiler.debug; |
| |
| import java.util.List; |
| |
| /** |
| * Facility for recording value frequencies. |
| */ |
| public interface DebugHistogram { |
| |
| /** |
| * Gets the name specified when this objected was {@linkplain Debug#createHistogram(String) |
| * created}. |
| */ |
| String getName(); |
| |
| /** |
| * Increments the count for a given value. |
| */ |
| void add(Object value); |
| |
| void add(Object value, long count); |
| |
| /** |
| * A value and a frequency. The ordering imposed by {@link #compareTo(CountedValue)} places |
| * values with higher frequencies first. |
| */ |
| class CountedValue implements Comparable<CountedValue> { |
| |
| private long count; |
| private final Object value; |
| |
| public CountedValue(long count, Object value) { |
| this.count = count; |
| this.value = value; |
| } |
| |
| @Override |
| public int compareTo(CountedValue o) { |
| if (count < o.count) { |
| return 1; |
| } else if (count > o.count) { |
| return -1; |
| } |
| return 0; |
| } |
| |
| @Override |
| public String toString() { |
| return count + " -> " + value; |
| } |
| |
| public void inc() { |
| count++; |
| } |
| |
| public void add(long n) { |
| count += n; |
| } |
| |
| public long getCount() { |
| return count; |
| } |
| |
| public Object getValue() { |
| return value; |
| } |
| } |
| |
| /** |
| * Gets a list of the counted values, sorted in descending order of frequency. |
| */ |
| List<CountedValue> getValues(); |
| |
| /** |
| * Interface for a service that can render a visualization of a histogram. |
| */ |
| public interface Printer { |
| |
| void print(DebugHistogram histogram); |
| } |
| } |