Interface MapStore<K,V>
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- Type Parameters:
K
- type of the MapStore keyV
- type of the MapStore value
- All Superinterfaces:
MapLoader<K,V>
- All Known Subinterfaces:
EntryStore<K,V>
- All Known Implementing Classes:
GenericMapStore
,MapStoreAdapter
public interface MapStore<K,V> extends MapLoader<K,V>
Hazelcast distributed map implementation is an in-memory data store, but it can be backed by any type of data store such as RDBMS, OODBMS, NOSQL, or simply a file-based data store.IMap.put(key, value) normally stores the entry into JVM's memory. If the MapStore implementation is provided then Hazelcast will also call the MapStore implementation to store the entry into a user-defined storage, such as RDBMS or some other external storage system. It is completely up to the user how the key-value will be stored or deleted.
Same goes for IMap.remove(key).
Store implementation can be called synchronously (write-through) or asynchronously (write-behind) depending on the configuration.
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Method Summary
All Methods Instance Methods Abstract Methods Modifier and Type Method Description void
delete(K key)
Deletes the entry with a given key from the store.void
deleteAll(java.util.Collection<K> keys)
Deletes multiple entries from the store.void
store(K key, V value)
Stores the key-value pair.void
storeAll(java.util.Map<K,V> map)
Stores multiple entries.-
Methods inherited from interface com.hazelcast.map.MapLoader
load, loadAll, loadAllKeys
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Method Detail
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store
void store(K key, V value)
Stores the key-value pair.If an exception is thrown then the put operation will fail.
- Parameters:
key
- key of the entry to storevalue
- value of the entry to store
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storeAll
void storeAll(java.util.Map<K,V> map)
Stores multiple entries.Implementation of this method can optimize the store operation by storing all entries in one database connection. storeAll() is used when writeDelaySeconds is positive (write-behind).If an exception is thrown, the entries will try to be stored one by one using the store() method.
Note: on the retry phase only entries left in the map will be stored one-by-one. In this way a MapStore implementation can handle partial storeAll() cases when some entries were stored successfully before a failure happens. Entries removed from the map will be not passed to subsequent call to store() method any more.
- Parameters:
map
- map of entries to store
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delete
void delete(K key)
Deletes the entry with a given key from the store.If an exception is thrown the remove operation will fail.
- Parameters:
key
- the key to delete from the store
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deleteAll
void deleteAll(java.util.Collection<K> keys)
Deletes multiple entries from the store.If an exception is thrown the entries will try to be deleted one by one using the delete() method.
Note: on the retry phase only entries left in the keys will be deleted one-by-one. In this way a MapStore implementation can handle partial deleteAll() cases when some entries were deleted successfully before a failure happens. Entries removed from the keys will be not passed to subsequent call to delete() method any more. The intended usage is to delete items from the provided collection as they are deleted from the store.
- Parameters:
keys
- the keys of the entries to delete.
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