- java.lang.Object
-
- com.sun.management.GcInfo
-
- All Implemented Interfaces:
CompositeData,CompositeDataView
public class GcInfo extends Object implements CompositeData, CompositeDataView
Garbage collection information. It contains the following information for one garbage collection as well as GC-specific attributes:- Start time
- End time
- Duration
- Memory usage before the collection starts
- Memory usage after the collection ends
- Since:
- 9
-
-
Method Summary
All Methods Static Methods Instance Methods Concrete Methods Modifier and Type Method Description static GcInfofrom(CompositeData cd)Returns aGcInfoobject represented by the givenCompositeData.longgetDuration()Returns the elapsed time of this GC in milliseconds.longgetEndTime()Returns the end time of this GC in milliseconds since the Java virtual machine was started.longgetId()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.longgetStartTime()Returns the start time of this GC in milliseconds since the Java virtual machine was started.CompositeDatatoCompositeData(CompositeType ct)Return theCompositeDatarepresentation of thisGcInfo, including any GC-specific attributes.-
Methods declared in class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
-
Methods declared in interface javax.management.openmbean.CompositeData
containsKey, containsValue, equals, get, getAll, getCompositeType, hashCode, toString, values
-
-
-
-
Method Detail
-
getId
public long getId()
- Returns:
- the identifier of this garbage collection which is the number of collections that this collector has done.
-
getStartTime
public long getStartTime()
Returns the start time of this GC in milliseconds since the Java virtual machine was started.- Returns:
- the start time of this GC.
-
getEndTime
public long getEndTime()
Returns the end time of this GC in milliseconds since the Java virtual machine was started.- Returns:
- the end time of this GC.
-
getDuration
public long getDuration()
Returns the elapsed time of this GC in milliseconds.- Returns:
- the elapsed time of this GC in milliseconds.
-
getMemoryUsageBeforeGc
public Map<String,MemoryUsage> getMemoryUsageBeforeGc()
Returns the memory usage of all memory pools at the beginning of this GC. This method returns aMapof the name of a memory pool to the memory usage of the corresponding memory pool before GC starts.- Returns:
- a
Mapof memory pool names to the memory usage of a memory pool before GC starts.
-
getMemoryUsageAfterGc
public Map<String,MemoryUsage> getMemoryUsageAfterGc()
Returns the memory usage of all memory pools at the end of this GC. This method returns aMapof the name of a memory pool to the memory usage of the corresponding memory pool when GC finishes.- Returns:
- a
Mapof memory pool names to the memory usage of a memory pool when GC finishes.
-
from
public static GcInfo from(CompositeData cd)
Returns aGcInfoobject represented by the givenCompositeData. The givenCompositeDatamust contain all the following attributes:CompositeData attributes Attribute Name Type index java.lang.LongstartTime java.lang.LongendTime java.lang.LongmemoryUsageBeforeGc javax.management.openmbean.TabularDatamemoryUsageAfterGc javax.management.openmbean.TabularData- Parameters:
cd-CompositeDatarepresenting aGcInfo- Returns:
- a
GcInfoobject represented bycdifcdis notnull;nullotherwise. - Throws:
IllegalArgumentException- ifcddoes not represent aGcInfoobject with the attributes described above.
-
toCompositeData
public CompositeData toCompositeData(CompositeType ct)
Return the
CompositeDatarepresentation of thisGcInfo, including any GC-specific attributes. The returned value will have at least all the attributes described in thefrommethod, plus optionally other attributes.- Specified by:
toCompositeDatain interfaceCompositeDataView- Parameters:
ct- theCompositeTypethat the caller expects. This parameter is ignored and can be null.- Returns:
- the
CompositeDatarepresentation.
-
-