org.netbeans.lib.profiler.heap.Heap Maven / Gradle / Ivy
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package org.netbeans.lib.profiler.heap;
import java.util.Collection;
import java.util.List;
import java.util.Properties;
/**
* This is top-level interface representing one instance of heap dump.
* @author Tomas Hurka
*/
public interface Heap {
//~ Methods ------------------------------------------------------------------------------------------------------------------
/**
* computes List of all {@link JavaClass} instances in this heap.
* The classes are ordered according to the position in the dump file.
*
* Speed: slow for the first time, subsequent invocations are fast.
* @return list of all {@link JavaClass} in the heap.
*/
List getAllClasses();
/**
* @return iterable walking through all instances in the heap
*/
Iterable getAllInstances();
/**
* @return iterable walking through all instances in the heap, starting with given instanceID
*/
Iterable getAllInstances(long instanceID);
/**
* computes List of N biggest {@link JavaClass} instances in this heap.
* The classes are ordered according to their retained size.
*
* Speed: slow for the first time, subsequent invocations are normal.
* @return list of N biggest {@link JavaClass} instances.
*/
List getBiggestObjectsByRetainedSize(int number);
/**
* returns {@link GCRoot} for {@link Instance}.
*
* Speed: normal for first invocation, fast for subsequent
* @param instance {@link Instance} whose associated {@link GCRoot} is to be returned.
* @return {@link GCRoot} for corresponding instance or null if instance is not GC root.
*/
GCRoot getGCRoot(Instance instance);
/**
* returns list of all GC roots.
*
* Speed: normal for first invocation, fast for subsequent
* @return list of {@link GCRoot} instances representing all GC roots.
*/
Collection getGCRoots();
/**
* computes {@link Instance} for instanceId.
*
* Speed: fast
* @param instanceId unique ID of {@link Instance}
* @return return null if there no {@link Instance} with instanceId, otherwise
* corresponding {@link Instance} is returned so that
* heap.getInstanceByID(instanceId).getInstanceId() == instanceId
*/
Instance getInstanceByID(long instanceId);
/**
* computes {@link JavaClass} for javaclassId.
*
* Speed: fast
* @param javaclassId unique ID of {@link JavaClass}
* @return return null if there no java class with javaclassId, otherwise corresponding {@link JavaClass}
* is returned so that heap.getJavaClassByID(javaclassId).getJavaClassId() == javaclassId
*/
JavaClass getJavaClassByID(long javaclassId);
/**
* computes {@link JavaClass} for fully qualified name.
*
* Speed: slow
* @param fqn fully qualified name of the java class.
* @return return null if there no class with fqn name, otherwise corresponding {@link JavaClass}
* is returned so that heap.getJavaClassByName(fqn).getName().equals(fqn)
*/
JavaClass getJavaClassByName(String fqn);
/**
* computes collection of {@link JavaClass} filtered by regular expression.
*
* Speed: slow
* @param regexp regular expression for java class name.
* @return return collection of {@link JavaClass} instances, which names satisfy the regexp expression. This
* collection is empty if no class matches the regular expression
*/
Collection getJavaClassesByRegExp(String regexp);
/**
* returns optional summary information of the heap.
* If this information is not available in the dump,
* some data (like number of instances) are computed
* from the dump itself.
*
* Speed: fast if the summary is available in dump, slow if
* summary needs to be computed from dump.
* @return {@link HeapSummary} of the heap
*/
HeapSummary getSummary();
/**
* Determines the system properties of the {@link Heap}. It returns {@link Properties} with the same
* content as if {@link System#getProperties()} was invoked in JVM, where this heap dump was taken.
*
* Speed: slow
* @return the system properties or null if the system properties cannot be computed from
* this {@link Heap}
*/
Properties getSystemProperties();
}