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In the TIBCO Hawk microagent GetMemoryUsage() , how are the values of TotalBytes, FreeBytes, UsedBytes and PercentUsed determined ? What are their units of measurement and what do they mean?

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In case of GetMemoryUsage of bwengine,  GetMemoryUsage() returns four values, i.e. TotalBytes,FreeBytes,UsedBytes and PercentUsed.

TotalBytes -  Total number of bytes allocated to the process engine.  
FreeBytes - Total number of bytes that are not currently in use.  
UsedBytes - Total number of bytes that are currently in use.  
PercentUsed - Percentage of total bytes that are in use.  

GetMemoryUsage() is used to determine how much memory is actually used by the JVM. The BusinessWorks (BW) engine is internally a Java Virtual Machine. It uses memory as given by Process(), but inside JVM it also tracks how much of stack space is used and how much is not. GetMemoryUsage tracks the inter-usage of memory of the JVM rather thatn the operation system memory usage.

The following methods are used to get the memory used by the JVM:

long totalMemory = java.lang.Runtime.getRuntime().totalMemory();
long freeMemory = java.lang.Runtime.getRuntime().freeMemory();

The unit of measure returned by the BW Engine getMemoryUsage() is in bytes.

In the TIBCO Hawk microagent GetMemoryUsage() , how are the values of TotalBytes, FreeBytes, UsedBytes and PercentUsed determined ? What are their units of measurement and what do they mean?