Class OfflineSorter

On-disk sorting of byte arrays. Each byte array (entry) is a composed of the following fields:

  • (two bytes) length of the following byte array,
  • exactly the above count of bytes for the sequence to be sorted.

Inheritance
System.Object
OfflineSorter
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: Lucene.Net.Util
Assembly: Lucene.Net.dll
Syntax
public sealed class OfflineSorter

Constructors

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OfflineSorter()

Defaults constructor.

Declaration
public OfflineSorter()
See Also
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OfflineSorter(IComparer<BytesRef>)

Defaults constructor with a custom comparer.

Declaration
public OfflineSorter(IComparer<BytesRef> comparer)
Parameters
Type Name Description
System.Collections.Generic.IComparer<BytesRef> comparer
See Also
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OfflineSorter(IComparer<BytesRef>, OfflineSorter.BufferSize, DirectoryInfo, Int32)

All-details constructor.

Declaration
public OfflineSorter(IComparer<BytesRef> comparer, OfflineSorter.BufferSize ramBufferSize, DirectoryInfo tempDirectory, int maxTempfiles)
Parameters
Type Name Description
System.Collections.Generic.IComparer<BytesRef> comparer
OfflineSorter.BufferSize ramBufferSize
System.IO.DirectoryInfo tempDirectory
System.Int32 maxTempfiles

Fields

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ABSOLUTE_MIN_SORT_BUFFER_SIZE

Absolute minimum required buffer size for sorting.

Declaration
public const long ABSOLUTE_MIN_SORT_BUFFER_SIZE = 524288L
Field Value
Type Description
System.Int64
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DEFAULT_COMPARER

Default comparer: sorts in binary (codepoint) order

Declaration
public static readonly IComparer<BytesRef> DEFAULT_COMPARER
Field Value
Type Description
System.Collections.Generic.IComparer<BytesRef>
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GB

Convenience constant for gigabytes

Declaration
public const long GB = 1073741824L
Field Value
Type Description
System.Int64
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MAX_TEMPFILES

Maximum number of temporary files before doing an intermediate merge.

Declaration
public const int MAX_TEMPFILES = 128
Field Value
Type Description
System.Int32
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MB

Convenience constant for megabytes

Declaration
public const long MB = 1048576L
Field Value
Type Description
System.Int64
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MIN_BUFFER_SIZE_MB

Minimum recommended buffer size for sorting.

Declaration
public const long MIN_BUFFER_SIZE_MB = 32L
Field Value
Type Description
System.Int64

Properties

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Comparer

Returns the comparer in use to sort entries

Declaration
public IComparer<BytesRef> Comparer { get; }
Property Value
Type Description
System.Collections.Generic.IComparer<BytesRef>

Methods

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DefaultTempDir()

Returns the default temporary directory. By default, the System's temp folder. If not accessible or not available, an System.IO.IOException is thrown.

Declaration
public static DirectoryInfo DefaultTempDir()
Returns
Type Description
System.IO.DirectoryInfo
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Sort(FileInfo, FileInfo)

Sort input to output, explicit hint for the buffer size. The amount of allocated memory may deviate from the hint (may be smaller or larger).

Declaration
public OfflineSorter.SortInfo Sort(FileInfo input, FileInfo output)
Parameters
Type Name Description
System.IO.FileInfo input
System.IO.FileInfo output
Returns
Type Description
OfflineSorter.SortInfo