Module openj9.dtfj

Package com.ibm.dtfj.java

Interface JavaRuntimeMemoryCategory

All Known Implementing Classes:

DTFJJavaRuntimeMemoryCategory, JCJavaRuntimeMemoryCategory

public interface JavaRuntimeMemoryCategory

Represents a category of native memory allocated by the Java runtime.

A category is a high-level grouping of memory allocations such as "Threads", "Classes" or "Java Heap".

Some Java runtime implementations use categories to track native memory use in the JRE.

Categories can have child categories and form a hierarchy.

The getShallow* methods return the allocation data for just this category. The getDeep* methods return the allocation data for this category and all its child categories.

Since:

1.5

Method Summary

Modifier and Type	Method	Description
Iterator	getChildren()	Gets iterator of child categories.
long	getDeepAllocations()	Gets number of allocations recorded against this category, and all children of this category.
long	getDeepBytes()	Gets number of bytes recorded against this category, and all children of this category.
Iterator	getMemorySections(boolean includeFreed)	Gets iterator of memory sections allocated against this category.
String	getName()	Gets the name of this category.
long	getShallowAllocations()	Gets number of allocations recorded against this category.
long	getShallowBytes()	Gets number of bytes allocated under this category.

Method Details

getName

String getName()
        throws CorruptDataException

Gets the name of this category. E.g. "Classes".

Returns:

Name string.

Throws:

CorruptDataException

getShallowAllocations

long getShallowAllocations()
                    throws CorruptDataException

Gets number of allocations recorded against this category.

Returns:

Allocation count.

Throws:

CorruptDataException

getShallowBytes

long getShallowBytes()
              throws CorruptDataException

Gets number of bytes allocated under this category.

Returns:

Number of bytes.

Throws:

CorruptDataException

getDeepAllocations

long getDeepAllocations()
                 throws CorruptDataException

Gets number of allocations recorded against this category, and all children of this category.

Returns:

Allocation count.

Throws:

CorruptDataException

getDeepBytes

long getDeepBytes()
           throws CorruptDataException

Gets number of bytes recorded against this category, and all children of this category.

Returns:

Number of bytes.

Throws:

CorruptDataException

getChildren

Iterator getChildren()
              throws CorruptDataException

Gets iterator of child categories.

Returns:

Iterator of JavaRuntimeMemoryCategory objects that are immediate children of this category.

Throws:

CorruptDataException

getMemorySections

Iterator getMemorySections(boolean includeFreed)
                    throws CorruptDataException,
DataUnavailable

Gets iterator of memory sections allocated against this category.

Parameters:

includeFreed - If true, iterator will iterate over blocks of memory that have been freed, but haven't been re-used yet.

Returns:

Iterator of memory sections

Throws:

CorruptDataException

DataUnavailable

See Also:

• CorruptData