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org.apache.lens.cube.metadata.timeline
Class PartitionTimeline

java.lang.Object
  org.apache.lens.cube.metadata.timeline.PartitionTimeline

All Implemented Interfaces:

Iterable<TimePartition>

Direct Known Subclasses:

EndsAndHolesPartitionTimeline, RangesPartitionTimeline, StoreAllPartitionTimeline

public abstract class PartitionTimeline
extends Object
implements Iterable<TimePartition>

Represents the in-memory data structure that represents timeline of all existing partitions for a given storage table, update period, partition column. Is an Abstract class. Can be implemented in multiple ways.

See Also:

EndsAndHolesPartitionTimeline, StoreAllPartitionTimeline

Constructor Summary

PartitionTimeline()

Method Summary

boolean	add(Collection<TimePartition> partitions) Add multiple partitions to timeline
abstract boolean	add(TimePartition partition) Add partition to timeline
void	addForBatchAddition(TimePartition partition) Add partition to local memory to be sent for batch addition.
boolean	commitBatchAdditions() Commit all partitions that were added to batch addition queue.
abstract boolean	drop(TimePartition toDrop) drop partition.
abstract boolean	exists(TimePartition partition) Checks partition existance
Date	getLatestDate() wrapper on latest data
void	init(org.apache.hadoop.hive.ql.metadata.Table table) Extracts timeline implementation class from table params and instantiates it with other arguments, also in table params.
abstract boolean	initFromProperties(Map<String,String> properties) deserialize member variables from given map
abstract boolean	isConsistent() whether timeline is in consistent state
abstract boolean	isEmpty() Whether No partitions have been registered
abstract TimePartition	latest() latest partition.
abstract Map<String,String>	toProperties() serialize member objects as map
void	updateTableParams(org.apache.hadoop.hive.ql.metadata.Table table) Sets PartitionTimeline implementation class's name and specific params in table param.

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods inherited from interface java.lang.Iterable

iterator

Constructor Detail

PartitionTimeline

public PartitionTimeline()

Method Detail

getLatestDate

public Date getLatestDate()

wrapper on latest data

updateTableParams

public void updateTableParams(org.apache.hadoop.hive.ql.metadata.Table table)

Sets PartitionTimeline implementation class's name and specific params in table param.

Parameters:

table -

See Also:

init(org.apache.hadoop.hive.ql.metadata.Table)

init

public void init(org.apache.hadoop.hive.ql.metadata.Table table)
          throws LensException

Extracts timeline implementation class from table params and instantiates it with other arguments, also in table params.

Parameters:

table -

Throws:

LensException

See Also:

updateTableParams(org.apache.hadoop.hive.ql.metadata.Table)

addForBatchAddition

public void addForBatchAddition(TimePartition partition)

Add partition to local memory to be sent for batch addition.

See Also:

commitBatchAdditions()

commitBatchAdditions

public boolean commitBatchAdditions()
                             throws LensException

Commit all partitions that were added to batch addition queue. //TODO: improve batch addition implementation.

Returns:

true if all the partitions were added successfully, or no partitions needed to be added

Throws:

LensException

add

public abstract boolean add(@NonNull
                            TimePartition partition)
                     throws LensException

Add partition to timeline

Parameters:

partition -

Returns:

whether add was successful

Throws:

LensException

add

public boolean add(@NonNull
                   Collection<TimePartition> partitions)
            throws LensException

Add multiple partitions to timeline

Parameters:

partitions -

Returns:

whether add was successful

Throws:

LensException

drop

public abstract boolean drop(@NonNull
                             TimePartition toDrop)
                      throws LensException

drop partition.

Parameters:

toDrop -

Returns:

whether drop was successful

Throws:

LensException

latest

public abstract TimePartition latest()

latest partition. will be null if no partitions exist.

Returns:

toProperties

public abstract Map<String,String> toProperties()

serialize member objects as map

Returns:

initFromProperties

public abstract boolean initFromProperties(Map<String,String> properties)
                                    throws LensException

deserialize member variables from given map

Parameters:

properties -

Returns:

true if after deserializing, the timeline is in consistent state

Throws:

LensException

See Also:

isConsistent()

isEmpty

public abstract boolean isEmpty()

Whether No partitions have been registered

Returns:

isConsistent

public abstract boolean isConsistent()

whether timeline is in consistent state

Returns:

exists

public abstract boolean exists(TimePartition partition)

Checks partition existance

Parameters:

partition -

Returns: