public long getId()

Returns the identifier of this garbage collection which is the number of collections that this collector has done.

public long getStartTime()

Returns the start time of this GC in milliseconds since the Java virtual machine was started.

public long getEndTime()

Returns the end time of this GC in milliseconds since the Java virtual machine was started.

public long getDuration()

Returns the elapsed time of this GC in milliseconds.

public Map<String,MemoryUsage> getMemoryUsageBeforeGc()

Returns the memory usage of all memory pools at the beginning of this GC. This method returns a Map of the name of a memory pool to the memory usage of the corresponding memory pool before GC starts.

public Map<String,MemoryUsage> getMemoryUsageAfterGc()

Returns the memory usage of all memory pools at the end of this GC. This method returns a Map of the name of a memory pool to the memory usage of the corresponding memory pool when GC finishes.

public static GcInfo from(CompositeData cd)

Returns a GcInfo object represented by the given CompositeData. The given CompositeData must contain all the following attributes:

description

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

public boolean containsKey(String key)

Returns true if and only if this CompositeData instance contains an item whose name is key. If key is a null or empty String, this method simply returns false.

public boolean containsValue(Object value)

Returns true if and only if this CompositeData instance contains an item whose value is value.

public boolean equals(Object obj)

Indicates whether some other object is "equal to" this one.

The equals method implements an equivalence relation on non-null object references:

• It is reflexive: for any non-null reference value x, x.equals(x) should return true.
• It is symmetric: for any non-null reference values x and y, x.equals(y) should return true if and only if y.equals(x) returns true.
• It is transitive: for any non-null reference values x, y, and z, if x.equals(y) returns true and y.equals(z) returns true, then x.equals(z) should return true.
• It is consistent: for any non-null reference values 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.
• For any non-null reference value x, x.equals(null) should return false.

An equivalence relation partitions the elements it operates on into equivalence classes; all the members of an equivalence class are equal to each other. Members of an equivalence class are substitutable for each other, at least for some purposes.

public Object get(String key)

Returns the value of the item whose name is key.

public 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.

public CompositeType getCompositeType()

Returns the composite type of this composite data instance.

public int hashCode()

Returns a hash code value for the object. This method is supported for the benefit of hash tables such as those provided by HashMap.

The general contract of hashCode is:

• Whenever it is invoked on the same object more than once during an execution of a Java application, the 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.
• If two objects are equal according to the equals method, then calling the hashCode method on each of the two objects must produce the same integer result.
• It is not required that if two objects are unequal according to the equals 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.

public String toString()

Returns a string representation of the object.

public Collection<?> values()

Returns an unmodifiable Collection view of the item values contained in this CompositeData instance. The returned collection's iterator will return the values in the ascending lexicographic order of the corresponding item names.

public 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.