Package org.opennms.features.distributed.kvstore.api

Class AbstractAsyncKeyValueStore<T>

java.lang.Object

org.opennms.features.distributed.kvstore.api.AbstractKeyValueStore<T>

org.opennms.features.distributed.kvstore.api.AbstractAsyncKeyValueStore<T>

All Implemented Interfaces:

KeyValueStore<T>

Direct Known Subclasses:

AbstractPostgresKeyValueStore, InMemoryMapBlobStore, NoOpBlobStore, NoOpJsonStore

public abstract class AbstractAsyncKeyValueStore<T>
extends AbstractKeyValueStore<T>

An implementation of KeyValueStore to extend for implementations that do not otherwise have access to async get/put operations.

This implementation wraps the synchronous get/put calls in a CompletableFuture and executes them async.

This implementation attempts to process all requests async but may instead process synchronously depending on the executor implementation used. The default is to degrade to synchronous processing if the executor is full.

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractAsyncKeyValueStore()
protected	AbstractAsyncKeyValueStore(Executor executor)

Method Summary

Modifier and Type	Method	Description
CompletableFuture<Void>	deleteAsync(String key, String context)
CompletableFuture<Map<String,T>>	enumerateContextAsync(String context)
CompletableFuture<Optional<T>>	getAsync(String key, String context)
CompletableFuture<Optional<Optional<T>>>	getIfStaleAsync(String key, String context, long timestamp)
CompletableFuture<OptionalLong>	getLastUpdatedAsync(String key, String context)
CompletableFuture<Long>	putAsync(String key, T value, String context, Integer ttlInSeconds)	Put a value with a suggested time-to-live after which the value should be expired and removed from the store.
CompletableFuture<Void>	truncateContextAsync(String context)	Remove all records for a given context.

Methods inherited from class org.opennms.features.distributed.kvstore.api.AbstractKeyValueStore

put, putAsync, truncateContext

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.opennms.features.distributed.kvstore.api.KeyValueStore

delete, enumerateContext, get, getIfStale, getLastUpdated, getName, put

Constructor Detail

AbstractAsyncKeyValueStore

protected AbstractAsyncKeyValueStore(Executor executor)

AbstractAsyncKeyValueStore

protected AbstractAsyncKeyValueStore()

Method Detail

putAsync

public final CompletableFuture<Long> putAsync(String key,
                                              T value,
                                              String context,
                                              Integer ttlInSeconds)

Description copied from interface: KeyValueStore

Put a value with a suggested time-to-live after which the value should be expired and removed from the store.

Records are expired on a best effort basis and depending on the implementation it is possible to get an expired record.

context - a context used to differentiate between keys with the same name (forms a compound key)

ttlInSeconds - the time to live in seconds for this key or no ttl if null

Returns:

a future containing the timestamp the value was persisted with

getAsync

public final CompletableFuture<Optional<T>> getAsync(String key,
                                                     String context)

context - a context used to differentiate between keys with the same name (forms a compound key)

Returns:

a future containing an optional of the value if present or empty if the key did not exist

getIfStaleAsync

public final CompletableFuture<Optional<Optional<T>>> getIfStaleAsync(String key,
                                                                      String context,
                                                                      long timestamp)

context - a context used to differentiate between keys with the same name (forms a compound key)

timestamp - the timestamp of the last known state such that if an record with a more recent timestamp is found the provided timestamp will be considered stale and the new record will be returned

Returns:

a future containing an optional that will be empty if the key was not found or will contain another optional that will be empty if not stale or contain the value if stale

getLastUpdatedAsync

public final CompletableFuture<OptionalLong> getLastUpdatedAsync(String key,
                                                                 String context)

context - a context used to differentiate between keys with the same name (forms a compound key)

Returns:

a future containing an optional of the the timestamp the key's value was last updated or empty if the key did not exist

enumerateContextAsync

public CompletableFuture<Map<String,T>> enumerateContextAsync(String context)

Parameters:

context - a context used to differentiate between keys with the same name (forms a compound key)

Returns:

a future containing a map of all the records matching the given context where the map's key is the record's key and the map's value is the records value

deleteAsync

public CompletableFuture<Void> deleteAsync(String key,
                                           String context)

context - a context used to differentiate between keys with the same name (forms a compound key)

Returns:

a future that is completed when the delete has finished

truncateContextAsync

public CompletableFuture<Void> truncateContextAsync(String context)

Description copied from interface: KeyValueStore

Remove all records for a given context.

Parameters:

context - a context used to differentiate between keys with the same name (forms a compound key)