Package org.apache.cassandra.utils

Interface Summary

Interface	Description
BiLongAccumulator<T,A>
BulkIterator<V>
Clock	Wrapper around time related functions that are either implemented by using the default JVM calls or by using a custom implementation for testing purposes.
Closeable
CloseableIterator<T>
FailingConsumer<T>
FastByteOperations.ByteOperations
IFilter
IFilter.FilterKey
IMergeIterator<In,Out>
IndexedSearchIterator<K,V>
IteratorWithLowerBound<In>
JVMStabilityInspector.OnKillHook	This class is usually used to avoid JVM exit when running junit tests.
LazyToString
LongAccumulator<T>
LongTimSort.LongComparator
MBeanWrapper	Helper class to avoid catching and rethrowing checked exceptions on MBean and allow turning of MBean registration for test purposes.
MonotonicClock	Wrapper around time related functions that are either implemented by using the default JVM calls or by using a custom implementation for testing purposes.
MonotonicClockTranslation
NativeLibraryWrapper	An interface to implement for using OS specific native methods.
OutputHandler
SearchIterator<K,V>
Throwables.DiscreteAction<E extends java.lang.Exception>
WithResources	A generic interface for encapsulating a Runnable task with related work before and after execution, using the built-in try-with-resources functionality offered by Closeable.

Class Summary

Class	Description
AbstractIterator<V>
AlwaysPresentFilter
Architecture
AsymmetricOrdering<T1,T2>
BiMultiValMap<K,V>	A variant of BiMap which does not enforce uniqueness of values.
BloomCalculations	The following calculations are taken from: http://www.cs.wisc.edu/~cao/papers/summary-cache/node8.html "Bloom Filters - the math" This class's static methods are meant to facilitate the use of the Bloom Filter class by helping to choose correct values of 'bits per element' and 'number of hash functions, k'.
BloomCalculations.BloomSpecification	A wrapper class that holds two key parameters for a Bloom Filter: the number of hash functions used, and the number of buckets per element used.
BloomFilter
BloomFilterSerializer
BooleanSerializer
BulkIterator.Adapter<V>
BulkIterator.FromArray<V>
ByteArrayUtil
ByteBufferUtil	Utility methods to make ByteBuffers less painful The following should illustrate the different ways byte buffers can be used public void testArrayOffet() { byte[] b = "test_slice_array".getBytes(); ByteBuffer bb = ByteBuffer.allocate(1024); assert bb.position() == 0; assert bb.limit() == 1024; assert bb.capacity() == 1024; bb.put(b); assert bb.position() == b.length; assert bb.remaining() == bb.limit() - bb.position(); ByteBuffer bb2 = bb.slice(); assert bb2.position() == 0; //slice should begin at other buffers current position assert bb2.arrayOffset() == bb.position(); //to match the position in the underlying array one needs to //track arrayOffset assert bb2.limit()+bb2.arrayOffset() == bb.limit(); assert bb2.remaining() == bb.remaining(); } }
CassandraVersion	Implements versioning used in Cassandra and CQL.
Clock.Default
Clock.Global
CollectionSerializer
Collectors3	Some extra Collector implementations.
ConcurrentBiMap<K,V>	A variant of BiMap that permits concurrent access, and expects uniqueness of values in both domain and range.
CounterId
DefaultValue<T>
DiagnosticSnapshotService	Provides a means to take snapshots when triggered by anomalous events or when the breaking of invariants is detected.
DirectorySizeCalculator	Walks directory recursively, summing up total contents of files within.
DynamicList<E>
DynamicList.Node<E>
EstimatedHistogram
EstimatedHistogram.EstimatedHistogramSerializer
ExecutorUtils
ExpiringMemoizingSupplier<T>	An implementation similar to Guava's Suppliers.memoizeWithExpiration(Supplier) but allowing for memoization to be skipped.
ExpiringMemoizingSupplier.Memoized<T>
ExpiringMemoizingSupplier.NotMemoized<T>
ExpiringMemoizingSupplier.ReturnValue<T>
FastByteOperations	Utility code to do optimized byte-array comparison.
FastByteOperations.PureJavaOperations
FastByteOperations.UnsafeOperations
FBUtilities
FilterFactory
GuidGenerator
HeapUtils	Utility to log heap histogram.
Hex
HistogramBuilder	Simple class for constructing an EsimtatedHistogram from a set of predetermined values
Int32Serializer
Int64Serializer
IntegerInterval	Mutable integer interval class, thread-safe.
IntegerInterval.Set	A mutable set of closed integer intervals, stored in normalized form (i.e.
Interval<C,D>
IntervalTree<C extends java.lang.Comparable<? super C>,D,I extends Interval<C,D>>
IntervalTree.Serializer<C extends java.lang.Comparable<? super C>,D,I extends Interval<C,D>>
JavaUtils	Utility method to retrieve information about the JRE.
JMXServerUtils
JMXServerUtils.JmxRegistry
JVMStabilityInspector	Responsible for deciding whether to kill the JVM if it gets in an "unstable" state (think OOM).
JVMStabilityInspector.Killer
LockedDynamicList<E>
LongTimSort	A stable, adaptive, iterative mergesort that requires far fewer than n lg(n) comparisons when running on partially sorted arrays, while offering performance comparable to a traditional mergesort when run on random arrays.
MBeanWrapper.DelegatingMbeanWrapper
MBeanWrapper.InstanceMBeanWrapper
MBeanWrapper.NoOpMBeanWrapper
MBeanWrapper.PlatformMBeanWrapper
MD5Digest	The result of the computation of an MD5 digest.
MergeIterator<In,Out>	Merges sorted input iterators which individually contain unique items.
MergeIterator.Candidate<In>
MergeIterator.Reducer<In,Out>	Accumulator that collects values of type A, and outputs a value of type B.
MerkleTree	A MerkleTree implemented as a binary tree.
MerkleTree.RowHash	Hash value representing a row, to be used to pass hashes to the MerkleTree.
MerkleTree.TreeRange	The public interface to a range in the tree.
MerkleTree.TreeRangeIterator	Returns the leaf (range) of a given tree in increasing order.
MerkleTrees	Wrapper class for handling of multiple MerkleTrees at once.
MerkleTrees.MerkleTreesSerializer
MonotonicClock.AbstractEpochSamplingClock
MonotonicClock.AbstractEpochSamplingClock.AlmostSameTime
MonotonicClock.Global
MonotonicClock.SampledClock
MonotonicClock.SystemClock
MurmurHash	This is a very fast, non-cryptographic hash suitable for general hash-based lookup.
Mx4jTool	If mx4j-tools is in the classpath call maybeLoad to load the HTTP interface of mx4j.
NativeLibrary
NativeLibraryDarwin	A NativeLibraryWrapper implementation for Darwin/Mac.
NativeLibraryLinux	A NativeLibraryWrapper implementation for Linux.
NativeSSTableLoaderClient
NoSpamLogger	Logging that limits each log statement to firing based on time since the statement last fired.
NullableSerializer
ObjectSizes	A convenience class for wrapping access to MemoryMeter
OutputHandler.LogOutput
OutputHandler.SystemOutput
OverlapIterator<I extends java.lang.Comparable<? super I>,V>	A class for iterating sequentially through an ordered collection and efficiently finding the overlapping set of matching intervals.
Pair<T1,T2>
RecomputingSupplier<T>	Supplier that caches the last computed value until it is reset, forcing every caller of RecomputingSupplier.get(long, TimeUnit) to wait until this value is computed if it was not computed yet.
ReflectionUtils
ResourceWatcher
ResourceWatcher.WatchedResource
RMIClientSocketFactoryImpl	This class is used to override the local address the JMX client calculates when trying to connect, which can otherwise be influenced by the system property "java.rmi.server.hostname" in strange and unpredictable ways.
RMIServerSocketFactoryImpl
SigarLibrary
SortedBiMultiValMap<K,V>
StatusLogger
SyncUtil
Throwables
TimeUUID
TimeUUID.AbstractSerializer<T extends TimeUUID>
TimeUUID.Generator
TimeUUID.Serializer
UUIDGen	The goods are here: www.ietf.org/rfc/rfc4122.txt.
UUIDSerializer
VoidSerializer
WithResources.None
Wrapped<T>	Simple wrapper class to be used when a lambda function needs to modify a variable outside it's scope.
WrappedBoolean	Simple wrapper for native boolean type
WrappedRunnable

Enum Summary

Enum	Description
AsymmetricOrdering.Op
ChecksumType
MBeanWrapper.OnException
NativeLibrary.OSType
Nemesis.Traffic
NoSpamLogger.Level	Levels for programmatically specifying the severity of a log statement
Shared.Recursive
Shared.Scope
Simulate.With
Throwables.FileOpType

Exception Summary

Exception	Description
WrappedException	Wrapped runtime exception for lambda functions

Annotation Types Summary

Annotation Type	Description
BreaksJMX	Annotation to have JMX breaking APIs not trigger test failures, each example must explain why it is ok to expose a JMX breaking API
Intercept
Isolated	Tells jvm-dtest that a class should be isolated and loaded into the instance class loader.
Nemesis	Annotate fields, particularly important volatile fields, where the system should adversarially schedule thread events around memory accesses (read or write).
Shared	Tells jvm-dtest that a class should be shared accross all ClassLoaders.
Simulate	Enable certain features for a specific method or class.