water.fvec

Class Vec.VectorGroup

java.lang.Object

water.Iced

water.fvec.Vec.VectorGroup

All Implemented Interfaces:

java.io.Externalizable, java.io.Serializable, java.lang.Cloneable, Freezable

Enclosing class:

Vec

public static class Vec.VectorGroup
extends Iced

Class representing the group of vectors. Vectors from the same group have same distribution of chunks among nodes. Each vector is member of exactly one group. Default group of one vector is created for each vector. Group of each vector can be retrieved by calling group() method; The expected mode of operation is that user wants to add new vectors matching the source. E.g. parse creates several vectors (one for each column) which are all colocated and are colocated with the original bytevector. To do this, user should first ask for the set of keys for the new vectors by calling addVecs method on the target group. Vectors in the group will have the same keys except for the prefix which specifies index of the vector inside the group. The only information the group object carries is it's own key and the number of vectors it contains (deleted vectors still count). Because vectors (and chunks) share the same key-pattern with the group, default group with only one vector does not have to be actually created, it is implicit.

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
static Vec.VectorGroup	VG_LEN1 The common shared vector group for very short vectors

Constructor Summary

Constructors

Constructor and Description
Vec.VectorGroup()

Method Summary

Methods

Modifier and Type	Method and Description
Key<Vec>	addVec() Shortcut for addVecs(1).
Key<Vec>[]	addVecs(int n) Gets the next n keys of this group.
boolean	equals(java.lang.Object o) True if two VectorGroups are equal
int	hashCode() VectorGroups's hashcode
int	reserveKeys(int n) Reserve a range of keys and return index of first new available key
static boolean	sameGroup(Vec v1, Vec v2)
java.lang.String	toString() Pretty print the VectorGroup
java.util.concurrent.Future	tryReturnKeys(int oldCnt, int newCnt)
Key<Vec>	vecKey(int vecId) Returns Vec Key from Vec id#

Methods inherited from class water.Iced

clone, frozenType, read_impl, read, readExternal, readJSON_impl, readJSON, toJsonString, write_impl, write, writeExternal, writeJSON_impl, writeJSON

Methods inherited from class java.lang.Object

finalize, getClass, notify, notifyAll, wait, wait, wait

Field Detail

VG_LEN1

public static final Vec.VectorGroup VG_LEN1

The common shared vector group for very short vectors

Constructor Detail

Vec.VectorGroup

public Vec.VectorGroup()

Method Detail

sameGroup

public static boolean sameGroup(Vec v1,
                Vec v2)

vecKey

public Key<Vec> vecKey(int vecId)

Returns Vec Key from Vec id#

Returns:

Vec Key from Vec id#

reserveKeys

public int reserveKeys(int n)

Reserve a range of keys and return index of first new available key

Returns:

Vec id# of a range of Vec keys in this group

tryReturnKeys

public java.util.concurrent.Future tryReturnKeys(int oldCnt,
                                        int newCnt)

addVecs

public Key<Vec>[] addVecs(int n)

Gets the next n keys of this group.

Parameters:

n - number of keys to make

Returns:

arrays of unique keys belonging to this group.

addVec

public Key<Vec> addVec()

Shortcut for addVecs(1).

Returns:

a new Vec Key in this group

See Also:

addVecs(int)

toString

public java.lang.String toString()

Pretty print the VectorGroup

Overrides:

toString in class java.lang.Object

Returns:

String representation of a VectorGroup

equals

public boolean equals(java.lang.Object o)

True if two VectorGroups are equal

Overrides:

equals in class java.lang.Object

Returns:

True if two VectorGroups are equal

hashCode

public int hashCode()

VectorGroups's hashcode

Overrides:

hashCode in class java.lang.Object

Returns:

VectorGroups's hashcode