Add support for heap dump compression (#16)

1 files changed, 39 insertions, 0 deletions

diff --git a/spark-common/src/main/java/me/lucko/spark/common/util/FormatUtil.java b/spark-common/src/main/java/me/lucko/spark/common/util/FormatUtil.java
new file mode 100644
index 0000000..37165d1
--- /dev/null
+++ b/spark-common/src/main/java/me/lucko/spark/common/util/FormatUtil.java
@@ -0,0 +1,39 @@
+/*
+ * This file is part of spark.
+ *
+ *  Copyright (c) lucko (Luck) <luck@lucko.me>
+ *  Copyright (c) contributors
+ *
+ *  This program is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program 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 for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+package me.lucko.spark.common.util;
+
+public final class FormatUtil {
+    private FormatUtil() {}
+
+    public static String percent(double value, double max) {
+        double percent = (value * 100d) / max;
+        return (int) percent + "%";
+    }
+
+    public static String formatBytes(long bytes) {
+        if (bytes == 0) {
+            return "0 bytes";
+        }
+        String[] sizes = new String[]{"bytes", "KB", "MB", "GB", "TB", "PB", "EB", "ZB", "YB"};
+        int sizeIndex = (int) (Math.log(bytes) / Math.log(1024));
+        return String.format("%.1f", bytes / Math.pow(1024, sizeIndex)) + " " + sizes[sizeIndex];
+    }
+}