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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
package com.yahoo.vespa.hosted.node.admin.nodeadmin;
import com.yahoo.yolean.Exceptions;
import java.nio.file.FileSystem;
import java.nio.file.Files;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
* Reads /proc/meminfo, see proc(5).
*
* @author hakon
*/
public class ProcMeminfoReader {
private static final String PROC_MEMINFO = "/proc/meminfo";
private static final Pattern MEM_TOTAL_PATTERN = Pattern.compile("MemTotal: *([0-9]+) kB");
private static final Pattern MEM_AVAILABLE_PATTERN = Pattern.compile("MemAvailable: *([0-9]+) kB");
private final FileSystem fileSystem;
public ProcMeminfoReader(FileSystem fileSystem) {
this.fileSystem = fileSystem;
}
public ProcMeminfo read() {
return read(Exceptions.uncheck(() -> Files.readString(fileSystem.getPath(PROC_MEMINFO))));
}
static ProcMeminfo read(String meminfoContent) {
return new ProcMeminfo(readKbGroup(meminfoContent, MEM_TOTAL_PATTERN),
readKbGroup(meminfoContent, MEM_AVAILABLE_PATTERN));
}
private static long readKbGroup(String string, Pattern pattern) {
Matcher matcher = pattern.matcher(string);
if (!matcher.find())
throw new IllegalArgumentException(pattern + " did not match anything in " + PROC_MEMINFO);
return Long.parseLong(matcher.group(1)) * 1024;
}
}
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