capCon

Class MemLRUParameters

java.lang.Object

capCon.MemLRUParameters

All Implemented Interfaces:

Serializable

public class MemLRUParameters
extends Object
implements Serializable

Class to define the parameters of a memLru eviction controller. Hydra parameters for shared memory size are taken into consideration. This is used primarily for tests that put fixed length keys and fixed length byte arrays into the region. With this assumption, this class can calculate the estimated entries, maximum megabytes, etc for the memory controller, and the test can then tell if eviction is occurring too early, or not occurring when expected.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
protected long	allowableExcessBytes
protected int	byteArraySize
protected int	bytesPerKey
protected int	keyLength
protected int	maximumMegabytes
static int	MEGABYTE
protected long	minEvictionBytes
static int	OFF_HEAP_OVERHEAD
protected int	perEntryOverhead
protected long	regionByteLimit
protected long	totalAllowableBytes
protected int	totalBytesPerEntry
static int	UNKNOWN

Constructor Summary

Constructors

Constructor and Description
MemLRUParameters(int keyLength, int maxMegabytes, com.gemstone.gemfire.cache.Region aRegion) Create an instance of MemLRUParameters.

Method Summary

Modifier and Type	Method and Description
long	getAllowableExcessBytes() Return the number of bytes that the test should allow the region to exceed the regionByteLimit.
int	getByteArraySize() Return the size of byte arrays stored as values in the region.
int	getKeyLength() Return the fixed keyLength settting.
int	getMaxEntries() Return the max number of entries in a region before going over the eviction controller's limit.
int	getMaximumMegabytes() Return the maximum megabytes setting for the memory evictor.
long	getMinEvictionBytes() Return the lower limit for the number of bytes that must be in a region before eviction occurs.
long	getRegionByteLimit() Return the maximum number of bytes set for a region.
long	getTotalAllowableBytes() Return the total number of bytes allowd in the region.
long	getTotalBytesPerEntry() Return the number of bytes in an entry (inludes key, value and overhead)
String	toString() Return a string describing all known and calculated parameters

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Field Detail

UNKNOWN

public static int UNKNOWN

MEGABYTE

public static final int MEGABYTE

See Also:

Constant Field Values

OFF_HEAP_OVERHEAD

public static final int OFF_HEAP_OVERHEAD

See Also:

Constant Field Values

byteArraySize

protected int byteArraySize

maximumMegabytes

protected int maximumMegabytes

minEvictionBytes

protected long minEvictionBytes

allowableExcessBytes

protected long allowableExcessBytes

totalAllowableBytes

protected long totalAllowableBytes

keyLength

protected int keyLength

regionByteLimit

protected long regionByteLimit

bytesPerKey

protected int bytesPerKey

perEntryOverhead

protected int perEntryOverhead

totalBytesPerEntry

protected int totalBytesPerEntry

Constructor Detail

MemLRUParameters

public MemLRUParameters(int keyLength,
                        int maxMegabytes,
                        com.gemstone.gemfire.cache.Region aRegion)

Create an instance of MemLRUParameters.

Method Detail

getByteArraySize

public int getByteArraySize()

Return the size of byte arrays stored as values in the region.

getMaximumMegabytes

public int getMaximumMegabytes()

Return the maximum megabytes setting for the memory evictor.

Throws:

TestException - if maximumMegabytes is not available

getMinEvictionBytes

public long getMinEvictionBytes()

Return the lower limit for the number of bytes that must be in a region before eviction occurs.

Throws:

TestException - if minEvictionBytes is not available

getKeyLength

public int getKeyLength()

Return the fixed keyLength settting.

Throws:

TestException - if keyLength is not available

getRegionByteLimit

public long getRegionByteLimit()

Return the maximum number of bytes set for a region. This is the number of bytes in maximumMegabytes.

Throws:

TestException - if regionByteLimit is not available

getTotalBytesPerEntry

public long getTotalBytesPerEntry()

Return the number of bytes in an entry (inludes key, value and overhead)

Throws:

TestException - if total bytes per entry is not available

getAllowableExcessBytes

public long getAllowableExcessBytes()

Return the number of bytes that the test should allow the region to exceed the regionByteLimit.

Throws:

TestException - if allowableExcessBytes is not available

getTotalAllowableBytes

public long getTotalAllowableBytes()

Return the total number of bytes allowd in the region.

Throws:

TestException - totalAllowableBytes is not available

getMaxEntries

public int getMaxEntries()

Return the max number of entries in a region before going over the eviction controller's limit.

Throws:

TestException - if maxEntries is not available

toString

public String toString()

Return a string describing all known and calculated parameters

Overrides:

toString in class Object