import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.List;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class MemInfoOsMemoryInfo implements OsMemoryInfo {
    // /proc/meminfo is in kB since Linux 4.0, see https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/fs/proc/task_mmu.c?id=39a8804455fb23f09157341d3ba7db6d7ae6ee76#n22

import spock.lang.Specification

class MemInfoOsMemoryInfoTest extends Specification {
    def "parses memory from /proc/meminfo on Linux 3.x"() {
        given:
        def snapshot = new MemInfoOsMemoryInfo().getOsSnapshotFromMemInfo(meminfoLinux3())

        expect:
        snapshot.physicalMemory.free == 32_343_658_496L
        snapshot.physicalMemory.total == 50_650_296_320L

        }
    }

    private OsMemoryInfo getLinuxDelegate() {
        OsMemoryInfo cGroupDelegate = new CGroupMemoryInfo();
        OsMemoryInfo memInfoDelegate = new MemInfoOsMemoryInfo();

        OsMemoryStatus cGroupSnapshot;
        OsMemoryStatus memInfoSnapshot;

        try {
            cGroupSnapshot = cGroupDelegate.getOsSnapshot();
        } catch (UnsupportedOperationException e) {

 * On Linux or MacOs, the free memory metric doesn't include reclaimable file system caches and will thus always report that the system is almost out of memory.
 * Use {@link MemInfoOsMemoryInfo} and {@link NativeOsMemoryInfo} instead.
 * On Windows, this doesn't include the secondary commit limit, which is the maximum amount of virtual memory that can be allocated.
 * Use {@link WindowsOsMemoryInfo} instead.
 */