@Exported public class GcInfo extends Object implements CompositeData, CompositeDataView
- Start time
- End time
- Duration
- Memory usage before the collection starts
- Memory usage after the collection ends
GcInfo is a CompositeData
The GC-specific attributes can be obtained via the CompositeData
interface. This is a historical relic, and other classes should
not copy this pattern. Use CompositeDataView instead.
CompositeData
with attributes as specified in the from method.| Modifier and Type | Method and Description |
|---|---|
boolean |
containsKey(String key)
Returns true if and only if this CompositeData instance contains
an item whose name is key.
|
boolean |
containsValue(Object value)
Returns true if and only if this CompositeData instance contains an item
whose value is value.
|
boolean |
equals(Object obj)
Indicates whether some other object is "equal to" this one.
|
static GcInfo |
from(CompositeData cd)
Returns a GcInfo object represented by the
given CompositeData.
|
Object |
get(String key)
Returns the value of the item whose name is key.
|
Object[] |
getAll(String[] keys)
Returns an array of the values of the items whose names are specified by keys, in the same order as keys.
|
CompositeType |
getCompositeType()
Returns the composite type of this composite data instance.
|
long |
getDuration()
Returns the elapsed time of this GC in milliseconds.
|
long |
getEndTime()
Returns the end time of this GC in milliseconds
since the Java virtual machine was started.
|
long |
getId()
Returns the identifier of this garbage collection which is
the number of collections that this collector has done.
|
Map<String,MemoryUsage> |
getMemoryUsageAfterGc()
Returns the memory usage of all memory pools
at the end of this GC.
|
Map<String,MemoryUsage> |
getMemoryUsageBeforeGc()
Returns the memory usage of all memory pools
at the beginning of this GC.
|
long |
getStartTime()
Returns the start time of this GC in milliseconds
since the Java virtual machine was started.
|
int |
hashCode()
Returns a hash code value for the object.
|
CompositeData |
toCompositeData(CompositeType ct)
Return the
CompositeData representation of this
GcInfo, including any GC-specific attributes. |
String |
toString()
Returns a string representation of the object.
|
Collection |
values()
Returns an unmodifiable Collection view of the item values contained in this CompositeData instance.
|
public long getId()
public long getStartTime()
public long getEndTime()
public long getDuration()
public Map<String,MemoryUsage> getMemoryUsageBeforeGc()
public Map<String,MemoryUsage> getMemoryUsageAfterGc()
public static GcInfo from(CompositeData cd)
Attribute Name Type index java.lang.Long startTime java.lang.Long endTime java.lang.Long memoryUsageBeforeGc javax.management.openmbean.TabularData memoryUsageAfterGc javax.management.openmbean.TabularData
IllegalArgumentException - if cd does not
represent a GcInfo object with the attributes
described above.public boolean containsKey(String key)
javax.management.openmbean.CompositeDatacontainsKey in interface CompositeDatakey - the key to be tested.public boolean containsValue(Object value)
javax.management.openmbean.CompositeDatacontainsValue in interface CompositeDatavalue - the value to be tested.public boolean equals(Object obj)
java.lang.Object
The equals method implements an equivalence relation
on non-null object references:
x, x.equals(x) should return
true.
x and y, x.equals(y)
should return true if and only if
y.equals(x) returns true.
x, y, and z, if
x.equals(y) returns true and
y.equals(z) returns true, then
x.equals(z) should return true.
x and y, multiple invocations of
x.equals(y) consistently return true
or consistently return false, provided no
information used in equals comparisons on the
objects is modified.
x,
x.equals(null) should return false.
The equals method for class Object implements
the most discriminating possible equivalence relation on objects;
that is, for any non-null reference values x and
y, this method returns true if and only
if x and y refer to the same object
(x == y has the value true).
Note that it is generally necessary to override the hashCode
method whenever this method is overridden, so as to maintain the
general contract for the hashCode method, which states
that equal objects must have equal hash codes.
equals in interface CompositeDataequals in class Objectobj - the reference object with which to compare.true if this object is the same as the obj
argument; false otherwise.Object.hashCode(),
HashMappublic Object get(String key)
javax.management.openmbean.CompositeDataget in interface CompositeDatakey - the name of the item.public Object[] getAll(String[] keys)
javax.management.openmbean.CompositeDatagetAll in interface CompositeDatakeys - the names of the items.public CompositeType getCompositeType()
javax.management.openmbean.CompositeDatagetCompositeType in interface CompositeDatapublic int hashCode()
java.lang.ObjectHashMap.
The general contract of hashCode is:
hashCode method
must consistently return the same integer, provided no information
used in equals comparisons on the object is modified.
This integer need not remain consistent from one execution of an
application to another execution of the same application.
equals(Object)
method, then calling the hashCode method on each of
the two objects must produce the same integer result.
Object.equals(java.lang.Object)
method, then calling the hashCode method on each of the
two objects must produce distinct integer results. However, the
programmer should be aware that producing distinct integer results
for unequal objects may improve the performance of hash tables.
As much as is reasonably practical, the hashCode method defined by
class Object does return distinct integers for distinct
objects. (This is typically implemented by converting the internal
address of the object into an integer, but this implementation
technique is not required by the
Java™ programming language.)
hashCode in interface CompositeDatahashCode in class ObjectObject.equals(java.lang.Object),
System.identityHashCode(java.lang.Object)public String toString()
java.lang.ObjecttoString method returns a string that
"textually represents" this object. The result should
be a concise but informative representation that is easy for a
person to read.
It is recommended that all subclasses override this method.
The toString method for class Object
returns a string consisting of the name of the class of which the
object is an instance, the at-sign character `@', and
the unsigned hexadecimal representation of the hash code of the
object. In other words, this method returns a string equal to the
value of:
getClass().getName() + '@' + Integer.toHexString(hashCode())
toString in interface CompositeDatatoString in class Objectpublic Collection values()
javax.management.openmbean.CompositeDatavalues in interface CompositeDatapublic CompositeData toCompositeData(CompositeType ct)
Return the CompositeData representation of this
GcInfo, including any GC-specific attributes. The
returned value will have at least all the attributes described
in the from method, plus optionally
other attributes.
toCompositeData in interface CompositeDataViewct - the CompositeType that the caller expects.
This parameter is ignored and can be null.CompositeData representation.
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