Java Utililty Methods Memory Information

String getAviableMemoryAsString()
get Aviable Memory As String

long avaiableMemory = getAvaiableMemory();
double d = avaiableMemory / 1048576;
return (int) d + "MB";

long getConsumedMemory(boolean preRunGarbageCollector)
get Consumed Memory

Runtime rt = getRuntimeAndRunGC(preRunGarbageCollector);
return bytesToMegabytes(rt.totalMemory() - rt.freeMemory());

char getDenotationOfJVMMemorySettings(String stringMapJavaOpts)
get Denotation Of JVM Memory Settings

int index = -1;
if (stringMapJavaOpts.lastIndexOf('k') != -1) {
 return 'k';
} else if (stringMapJavaOpts.lastIndexOf('K') != -1) {
 return 'K';
} else if ((index = stringMapJavaOpts.lastIndexOf('m')) != -1 && index != 2) {
 return 'm';
} else if ((index = stringMapJavaOpts.lastIndexOf('M')) != -1) {
...

String getInMemoryURL(String dbName)
get In Memory URL

String url = IN_MEMORY_URL_PREFIX + dbName;
return url;

long getJavaMemorySize(String string)
get Java Memory Size

String suffix = string.substring(string.length() - 1);
if (!suffix.matches(DIGITS_PATTERN)) {
 long value = Long.parseLong(string.substring(0, string.length() - 1));
 if (suffix.equalsIgnoreCase("k")) {
 value *= K;
 } else if (suffix.equalsIgnoreCase("m")) {
 value *= M;
 } else if (suffix.equalsIgnoreCase("g")) {
...

long getJVMMemoryMB()
get JVM Memory MB

return (Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) / mb;

String getMemory()
get Memory

return tidyFileSize(Runtime.getRuntime().totalMemory() - Runtime.getRuntime().freeMemory()) + " / "
 + tidyFileSize(Runtime.getRuntime().totalMemory()) + " / "
 + tidyFileSize(Runtime.getRuntime().maxMemory());

long getMemory()
get Memory

long used = 0;
for (int i = 0; i < 10; i++) {
 System.gc();
 long total = Runtime.getRuntime().totalMemory();
 long free = Runtime.getRuntime().freeMemory();
 used = total - free;
 if (used < MAX_MEMORY)
 return used;
...

long getMemory(String memory)
get Memory

switch (memory.charAt(memory.length() - 1)) {
case 'k':
case 'K':
 return Long.parseLong(memory.substring(0, memory.length() - 1)) * 1000L;
case 'm':
case 'M':
 return Long.parseLong(memory.substring(0, memory.length() - 1)) * 1000000L;
case 'g':
...

long getMemoryConsumedSincePreviousCall()
Returns amount of memory consumed since last call to getFreeMemory() (or this method)

long currentConsumption = runtime.freeMemory();
long consumed = currentConsumption - lastMemoryReading;
lastMemoryReading = currentConsumption;
return consumed;