Show 'available' physical memory instead of 'free'

1 files changed, 79 insertions, 0 deletions

diff --git a/spark-common/src/main/java/me/lucko/spark/common/util/LinuxProc.java b/spark-common/src/main/java/me/lucko/spark/common/util/LinuxProc.java
new file mode 100644
index 0000000..0926ae7
--- /dev/null
+++ b/spark-common/src/main/java/me/lucko/spark/common/util/LinuxProc.java
@@ -0,0 +1,79 @@
+/*
+ * 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;
+
+import org.checkerframework.checker.nullness.qual.NonNull;
+import org.checkerframework.checker.nullness.qual.Nullable;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.nio.file.Paths;
+import java.util.Collections;
+import java.util.List;
+
+/**
+ * Utility for reading from /proc/ on Linux systems.
+ */
+public enum LinuxProc {
+
+    /**
+     * Information about the system CPU.
+     */
+    CPUINFO("/proc/cpuinfo"),
+
+    /**
+     * Information about the system memory.
+     */
+    MEMINFO("/proc/meminfo");
+
+    private final Path path;
+
+    LinuxProc(String path) {
+        this.path = resolvePath(path);
+    }
+
+    private static @Nullable Path resolvePath(String path) {
+        try {
+            Path p = Paths.get(path);
+            if (Files.isReadable(p)) {
+                return p;
+            }
+        } catch (Exception e) {
+            // ignore
+        }
+        return null;
+    }
+
+    public @NonNull List<String> read() {
+        if (this.path != null) {
+            try {
+                return Files.readAllLines(this.path, StandardCharsets.UTF_8);
+            } catch (IOException e) {
+                // ignore
+            }
+        }
+
+        return Collections.emptyList();
+    }
+
+}