//package org.beryl.util;
import java.util.Locale;
public class Memory {
public static final long KB_IN_BYTES = 1024;
public static final long MB_IN_BYTES = 1024 * KB_IN_BYTES;
public static final long GB_IN_BYTES = 1024 * MB_IN_BYTES;
public static final long TB_IN_BYTES = 1024 * GB_IN_BYTES;
public static final long FOUR_MB_IN_BYTES = 4 * MB_IN_BYTES;
final static long [] sizeArray = { TB_IN_BYTES, GB_IN_BYTES, MB_IN_BYTES, KB_IN_BYTES, 1 };
final static String [] sizeUnitsArray = { "TB", "GB", "MB", "KB", "bytes" };
public static long getReasonableMemoryCushion() {
return FOUR_MB_IN_BYTES;
}
public static long bytesToKilobytes(long bytes) {
return bytes / KB_IN_BYTES;
}
public static long bytesToMegabytes(long bytes) {
return bytes / MB_IN_BYTES;
}
public static long bytesToGigabytes(long bytes) {
return bytes / GB_IN_BYTES;
}
public static long bytesToTerabytes(long bytes) {
return bytes / TB_IN_BYTES;
}
public static long freeMemory() {
final Runtime rt = Runtime.getRuntime();
return rt.freeMemory();
}
public static long memoryLimit() {
final Runtime rt = Runtime.getRuntime();
return rt.maxMemory();
}
public static double consumptionRatio() {
return freeMemory() / (double)memoryLimit();
}
public static String toString(long bytes) {
String byteSizeString = " bytes";
final int length = sizeArray.length;
double size;
double dBytes = (double) bytes;
for(int i = 0; i < length; i++) {
size = dBytes / sizeArray[i];
if(size >= 1.0) {
byteSizeString = String.format(Locale.ENGLISH, "%.4f %s", size, sizeUnitsArray[i]);
break;
}
}
return byteSizeString;
}
}