Package org.apache.flink.runtime.util

Interface Summary

Interface	Description
KeyGroupedIterator<E>
MemoryBlockIterator	The memory block iterator is an iterator that always buffers a block of elements in memory.
ResettableIterator<E>	The resettable iterator is a specialization of the iterator, allowing to reset the iterator and re-retrieve elements.
ResettableMutableObjectIterator<E>	The resettable iterator is a specialization of the iterator, allowing to reset the iterator and re-retrieve elements.

Class Summary

Class	Description
AtomicDisposableReferenceCounter	Atomic reference counter, which enters a "disposed" state after it reaches a configurable reference count (default 0).
ClassLoaderUtil	Utilities for information with respect to class loaders, specifically class loaders for the dynamic loading of user defined classes.
DataInputDeserializer	A simple and efficient deserializer for the DataInput interface.
DataOutputSerializer	A simple and efficient serializer for the DataOutput interface.
DependencyVisitor	This class tracks class dependency with ASM visitors.
EmptyIterator<E>	An empty iterator that never returns anything.
EmptyMutableObjectIterator<E>	An empty mutable object iterator that never returns anything.
EnvironmentInformation	Utility class that gives access to the execution environment of the JVM, like the executing user, startup options, or the JVM version.
EnvironmentInformation.RevisionInformation	Revision information encapsulates information about the source code revision of the Flink code.
ExecutorThreadFactory
FileUtils	This is a utility class to deal with temporary files.
IntArrayList	Minimal implementation of an array-backed list of ints
IOUtils	An utility class for I/O related functionality.
JarFileCreator	This is an auxiliary program which creates a jar file from a set of classes.
LeaderConnectionInfo	Wrapper class for a pair of connection address and leader session ID.
LeaderRetrievalUtils	Utility class to work with LeaderRetrievalService class.
LeaderRetrievalUtils.LeaderConnectionInfoListener	Helper class which is used by the retrieveLeaderConnectionInfo method to retrieve the leader's akka URL and the current leader session ID.
LeaderRetrievalUtils.LeaderGatewayListener	Helper class which is used by the retrieveLeaderGateway method as the LeaderRetrievalListener.
LongArrayList	Minimal implementation of an array-backed list of longs
LRUCache<V>
LRUCacheMap<K,V>
MathUtils	Collection of simple mathematical routines.
NonReusingKeyGroupedIterator<E>	The key grouped iterator returns a key and all values that share the same key.
NonReusingMutableToRegularIteratorWrapper<T>	This class wraps a MutableObjectIterator into a regular Iterator.
RegularToMutableObjectIterator<T>
ReusingKeyGroupedIterator<E>	The KeyValueIterator returns a key and all values that belong to the key (share the same key).
ReusingMutableToRegularIteratorWrapper<T>	This class wraps a MutableObjectIterator into a regular Iterator.
SerializableArrayList<E extends org.apache.flink.core.io.IOReadableWritable>	This class extends a standard ArrayList by implementing the IOReadableWritable interface.
SerializableHashMap<K extends org.apache.flink.core.io.IOReadableWritable,V extends org.apache.flink.core.io.IOReadableWritable>	This class extends a standard HashMap by implementing the IOReadableWritable interface.
SerializableHashSet<T extends org.apache.flink.core.io.IOReadableWritable>	This class extends a standard HashSet by implementing the IOReadableWritable interface.
SerializableObject	A simple object that only implements Serializable, so it can be used in serializable classes.
SignalHandler	This signal handler / signal logger is based on Apache Hadoop's org.apache.hadoop.util.SignalLogger.
SingleElementIterator<E>	An Iterator that contains only a single element.
StandaloneUtils	Utility class to work with Flink standalone mode.
UnionIterator<T>
ZooKeeperUtils

Exception Summary

Exception	Description
SerializedThrowable	Utility class for dealing with user-defined Throwable types that are serialized (for example during RPC/Actor communication), but cannot be resolved with the default class loader.