# Package org.apache.cassandra.utils

- Interface Summary
  Interface | Description
  --- | ---
  BatchRemoveIterator<T> | Iterator that allows us to more efficiently remove many items
  CloseableIterator<T> |
  CoalescingStrategies.Coalescable |
  FastByteOperations.ByteOperations |
  IFilter |
  IFilter.FilterKey |
  IMergeIterator<In,Out> |
  OutputHandler |
  SearchIterator<K,V> |

- Class Summary
  Class | Description
  --- | ---
  AlwaysPresentFilter |
  AsymmetricOrdering<T1,T2> |
  BackgroundActivityMonitor |
  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 |
  BooleanSerializer |
  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(); } }
  BytesReadTracker | This class is to track bytes read from given DataInput
  CassandraVersion | Implements versioning used in Cassandra and CQL.
  CLibrary |
  CoalescingStrategies |
  CoalescingStrategies.CoalescingStrategy |
  ConcurrentBiMap<K,V> | A variant of BiMap that permits concurrent access, and expects uniqueness of values in both domain and range.
  CounterId |
  CRC32Factory | CRC Factory that uses our pure java crc for default
  DefaultInteger |
  EstimatedHistogram |
  EstimatedHistogram.EstimatedHistogramSerializer |
  ExpiringMap<K,V> |
  ExpiringMap.CacheableObject<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
  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.
  JVMStabilityInspector | Responsible for deciding whether to kill the JVM if it gets in an "unstable" state (think OOM).
  JVMStabilityInspector.Killer |
  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.MerkleTreeSerializer |
  MerkleTree.RowHash | Hash value representing a row, to be used to pass hashes to the MerkleTree.
  MerkleTree.TreeDifference |
  MerkleTree.TreeRange | The public interface to a range in the tree.
  MerkleTree.TreeRangeIterator | Returns the leaf (range) of a given tree in increasing order.
  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.
  NanoTimeToCurrentTimeMillis |
  NativeSSTableLoaderClient |
  NoSpamLogger | Logging that limits each log statement to firing based on time since the statement last fired.
  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> |
  PureJavaCrc32 | NOTE: You should be using CRCFactory class because it will pick a better version based on your JDK version A pure-java implementation of the CRC32 checksum that uses the same polynomial as the built-in native CRC32.
  ResourceWatcher |
  ResourceWatcher.WatchedResource |
  RMIServerSocketFactoryImpl |
  SigarLibrary |
  SortedBiMultiValMap<K,V> |
  StatusLogger |
  StreamingHistogram | Histogram that can be constructed from streaming of data.
  StreamingHistogram.StreamingHistogramSerializer |
  SyncUtil |
  Throwables |
  TopKSampler<T> |
  TopKSampler.SamplerResult<S> | Represents the cardinality and the topK ranked items collected during a sample period
  UUIDGen | The goods are here: www.ietf.org/rfc/rfc4122.txt.
  UUIDSerializer |
  WindowsTimer |
  WrappedRunnable |

- Enum Summary
  Enum | Description
  --- | ---
  AsymmetricOrdering.Op |
  NoSpamLogger.Level | Levels for programmatically specifying the severity of a log statement

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