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https://issues.apache.org/jira/browse/BEAM-42?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15857350#comment-15857350
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Jingsong Lee edited comment on BEAM-42 at 2/8/17 4:02 AM:
----------------------------------------------------------
MapState maybe need more "sighted write"(contrary to "blind write"). There are
also interfaces to be discussed.
{code:title=Bar.java|borderStyle=solid}
/**
* An object that maps keys to values.
* A map cannot contain duplicate keys;
* each key can map to at most one value.
*
* @param <K> the type of keys maintained by this map
* @param <V> the type of mapped values
*/
public interface MapState<K, V> extends ReadableState<Iterable<Map.Entry<K,
V>>>, State {
V get(K key);
void put(K key, V value);
V putIfAbsent(K key, V value);
void remove(K key);
Iterable<K> keys();
Iterable<V> values();
@Override
MapState<K, V> readLater();
}
{code}
was (Author: lzljs3620320):
MapState maybe need more "sighted write"(contrary to "blind write"). There are
also interfaces to be discussed.
{code:title=Bar.java|borderStyle=solid}
/**
* An object that maps keys to values.
* A map cannot contain duplicate keys;
* each key can map to at most one value.
*
* @param <K> the type of keys maintained by this map
* @param <V> the type of mapped values
*/
public interface MapState<K, V> extends ReadableState<Iterator<Map.Entry<K,
V>>>, State {
V get(K key);
void put(K key, V value);
V putIfAbsent(K key, V value);
void remove(K key);
Iterable<K> keys();
Iterable<V> values();
@Override
MapState<K, V> readLater();
}
{code}
> State for "Map" data, supporting efficient key lookup, etc.
> -----------------------------------------------------------
>
> Key: BEAM-42
> URL: https://issues.apache.org/jira/browse/BEAM-42
> Project: Beam
> Issue Type: New Feature
> Components: beam-model
> Reporter: Kenneth Knowles
> Assignee: Kenneth Knowles
> Priority: Minor
> Labels: State
>
> Analogous to BagState's blind writes, and SetState's efficient membership
> check, MapState would add efficient key lookup and mutation, and other
> Map-related operations.
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