org.apache.ignite

## Interface Ignite

- All Superinterfaces:
    AutoCloseable
  All Known Implementing Classes:
    IgniteSpringBean

      public interface Ignite
      extends AutoCloseable

  Main entry-point for all Ignite APIs. You can obtain an instance of `Ignite` through `Ignition.ignite()`, or for named grids you can use `Ignition.ignite(String)`. Note that you can have multiple instances of `Ignite` running in the same VM by giving each instance a different name.

  Ignite provides the following functionality:

  - `IgniteCluster` - clustering functionality.
  - `IgniteCache` - functionality for in-memory distributed cache, including SQL, TEXT, and Predicate-based queries.
  - `IgniteTransactions` - distributed ACID-compliant transactions.
  - `IgniteDataStreamer` - functionality for streaming large amounts of data into cache.
  - `IgniteCompute` - functionality for executing tasks and closures on all grid nodes (inherited form `ClusterGroup`).
  - `IgniteServices` - distributed service grid functionality (e.g. singletons on the cluster).
  - `IgniteMessaging` - functionality for topic-based message exchange on all grid nodes (inherited form `ClusterGroup`).
  - `IgniteEvents` - functionality for querying and listening to events on all grid nodes (inherited form `ClusterGroup`).
  - `ExecutorService` - distributed thread pools.
  - `IgniteAtomicLong` - distributed atomic long.
  - `IgniteAtomicReference` - distributed atomic reference.
  - `IgniteAtomicSequence` - distributed atomic sequence.
  - `IgniteAtomicStamped` - distributed atomic stamped reference.
  - `IgniteCountDownLatch` - distributed count down latch.
  - `IgniteQueue` - distributed blocking queue.
  - `IgniteSet` - distributed concurrent set.
  - `IgniteScheduler` - functionality for scheduling jobs using UNIX Cron syntax.

- - ### Method Summary

    All Methods Instance Methods Abstract Methods Deprecated Methods
    Modifier and Type | Method and Description
    --- | ---
    `boolean` | `active()` Deprecated. Use `IgniteCluster.active()` instead.
    `void` | `active(boolean active)` Deprecated. Use `IgniteCluster.active(boolean)` instead.
    `<K,V> void` | `addCacheConfiguration(CacheConfiguration<K,V> cacheCfg)` Adds cache configuration template.
    `<K> Affinity<K>` | `affinity(String cacheName)` Gets affinity service to provide information about data partitioning and distribution.
    `IgniteAtomicLong` | `atomicLong(String name, AtomicConfiguration cfg, long initVal, boolean create)` Will get a atomic long from cache and create one if it has not been created yet and `create` flag is `true`.
    `IgniteAtomicLong` | `atomicLong(String name, long initVal, boolean create)` Will get a atomic long from cache and create one if it has not been created yet and `create` flag is `true`.
    `<T> IgniteAtomicReference<T>` | `atomicReference(String name, AtomicConfiguration cfg, T initVal, boolean create)` Will get a atomic reference from cache and create one if it has not been created yet and `create` flag is `true`.
    `<T> IgniteAtomicReference<T>` | `atomicReference(String name, T initVal, boolean create)` Will get a atomic reference from cache and create one if it has not been created yet and `create` flag is `true`.
    `IgniteAtomicSequence` | `atomicSequence(String name, AtomicConfiguration cfg, long initVal, boolean create)` Will get an atomic sequence from cache and create one if it has not been created yet and `create` flag is `true`.
    `IgniteAtomicSequence` | `atomicSequence(String name, long initVal, boolean create)` Will get an atomic sequence from cache and create one if it has not been created yet and `create` flag is `true`.
    `<T,S> IgniteAtomicStamped<T,S>` | `atomicStamped(String name, AtomicConfiguration cfg, T initVal, S initStamp, boolean create)` Will get a atomic stamped from cache and create one if it has not been created yet and `create` flag is `true`.
    `<T,S> IgniteAtomicStamped<T,S>` | `atomicStamped(String name, T initVal, S initStamp, boolean create)` Will get a atomic stamped from cache and create one if it has not been created yet and `create` flag is `true`.
    `IgniteBinary` | `binary()` Gets an instance of `IgniteBinary` interface.
    `<K,V> IgniteCache<K,V>` | `cache(String name)` Gets an instance of `IgniteCache` API.
    `Collection<String>` | `cacheNames()` Gets the collection of names of currently available caches.
    `void` | `close()` Closes `this` instance of grid.
    `IgniteCluster` | `cluster()` Gets an instance of `IgniteCluster` interface.
    `IgniteCompute` | `compute()` Gets `compute` facade over all cluster nodes started in server mode.
    `IgniteCompute` | `compute(ClusterGroup grp)` Gets `compute` facade over the specified cluster group.
    `IgniteConfiguration` | `configuration()` Gets the configuration of this Ignite instance.
    `IgniteCountDownLatch` | `countDownLatch(String name, int cnt, boolean autoDel, boolean create)` Gets or creates count down latch.
    `<K,V> IgniteCache<K,V>` | `createCache(CacheConfiguration<K,V> cacheCfg)` Dynamically starts new cache with the given cache configuration.
    `<K,V> IgniteCache<K,V>` | `createCache(CacheConfiguration<K,V> cacheCfg, NearCacheConfiguration<K,V> nearCfg)` Dynamically starts new cache with the given cache configuration.
    `<K,V> IgniteCache<K,V>` | `createCache(String cacheName)` Dynamically starts new cache using template configuration.
    `Collection<IgniteCache>` | `createCaches(Collection<CacheConfiguration> cacheCfgs)` Dynamically starts new caches with the given cache configurations.
    `<K,V> IgniteCache<K,V>` | `createNearCache(String cacheName, NearCacheConfiguration<K,V> nearCfg)` Starts a near cache on local node if cache was previously started with one of the `createCache(CacheConfiguration)` or `createCache(CacheConfiguration, NearCacheConfiguration)` methods.
    `Collection<DataRegionMetrics>` | `dataRegionMetrics()` Returns a collection of `DataRegionMetrics` that reflects page memory usage on this Apache Ignite node instance.
    `@Nullable DataRegionMetrics` | `dataRegionMetrics(String memPlcName)` Returns the latest `DataRegionMetrics` snapshot for the memory region of the given name.
    `DataStorageMetrics` | `dataStorageMetrics()`
    `<K,V> IgniteDataStreamer<K,V>` | `dataStreamer(String cacheName)` Gets a new instance of data streamer associated with given cache name.
    `void` | `destroyCache(String cacheName)` Stops dynamically started cache.
    `void` | `destroyCaches(Collection<String> cacheNames)` Stops dynamically started caches.
    `IgniteEncryption` | `encryption()` Gets an instance of `IgniteEncryption` interface.
    `IgniteEvents` | `events()` Gets `events` facade over all cluster nodes.
    `IgniteEvents` | `events(ClusterGroup grp)` Gets `events` facade over nodes within the cluster group.
    `ExecutorService` | `executorService()` Creates a new `ExecutorService` which will execute all submitted `Callable` and `Runnable` jobs on all cluster nodes.
    `ExecutorService` | `executorService(ClusterGroup grp)` Creates a new `ExecutorService` which will execute all submitted `Callable` and `Runnable` jobs on nodes in the specified cluster group.
    `<K,V> IgniteCache<K,V>` | `getOrCreateCache(CacheConfiguration<K,V> cacheCfg)` Gets existing cache with the given name or creates new one with the given configuration.
    `<K,V> IgniteCache<K,V>` | `getOrCreateCache(CacheConfiguration<K,V> cacheCfg, NearCacheConfiguration<K,V> nearCfg)` Gets existing cache with the given cache configuration or creates one if it does not exist.
    `<K,V> IgniteCache<K,V>` | `getOrCreateCache(String cacheName)` Gets existing cache with the given name or creates new one using template configuration.
    `Collection<IgniteCache>` | `getOrCreateCaches(Collection<CacheConfiguration> cacheCfgs)` Gets existing caches with the given name or created one with the given configuration.
    `<K,V> IgniteCache<K,V>` | `getOrCreateNearCache(String cacheName, NearCacheConfiguration<K,V> nearCfg)` Gets existing near cache with the given name or creates a new one.
    `IgniteLogger` | `log()` Gets grid's logger.
    `Collection<MemoryMetrics>` | `memoryMetrics()` Deprecated. Use `dataRegionMetrics()` instead.
    `@Nullable MemoryMetrics` | `memoryMetrics(String memPlcName)` Deprecated. Use `dataRegionMetrics(String)` instead.
    `IgniteMessaging` | `message()` Gets `messaging` facade over all cluster nodes.
    `IgniteMessaging` | `message(ClusterGroup grp)` Gets `messaging` facade over nodes within the cluster group.
    `String` | `name()` Gets the name of the Ignite instance.
    `PersistenceMetrics` | `persistentStoreMetrics()` Deprecated. Use `dataStorageMetrics()` instead.
    `<T extends IgnitePlugin> T` | `plugin(String name)` Gets an instance of deployed Ignite plugin.
    `<T> IgniteQueue<T>` | `queue(String name, int cap, @Nullable CollectionConfiguration cfg)` Will get a named queue from cache and create one if it has not been created yet and `cfg` is not `null`.
    `IgniteLock` | `reentrantLock(String name, boolean failoverSafe, boolean fair, boolean create)` Gets or creates reentrant lock.
    `void` | `resetLostPartitions(Collection<String> cacheNames)` Clears partition's lost state and moves caches to a normal mode.
    `IgniteScheduler` | `scheduler()` Gets an instance of cron-based scheduler.
    `IgniteSemaphore` | `semaphore(String name, int cnt, boolean failoverSafe, boolean create)` Gets or creates semaphore.
    `IgniteServices` | `services()` Gets `services` facade over all cluster nodes started in server mode.
    `IgniteServices` | `services(ClusterGroup grp)` Gets `services` facade over nodes within the cluster group.
    `<T> IgniteSet<T>` | `set(String name, @Nullable CollectionConfiguration cfg)` Will get a named set from cache and create one if it has not been created yet and `cfg` is not `null`.
    `IgniteSnapshot` | `snapshot()`
    `@NotNull TracingConfigurationManager` | `tracingConfiguration()` Returns the `TracingConfigurationManager` instance that allows to Configure tracing parameters such as sampling rate for the specific tracing coordinates such as scope and label.
    `IgniteTransactions` | `transactions()` Gets grid transactions facade.
    `IgniteProductVersion` | `version()` Gets Ignite version.

- - ### Method Detail

    - #### name

          String name()

      Gets the name of the Ignite instance. The name allows having multiple Ignite instances with different names within the same Java VM.

      If default Ignite instance is used, then `null` is returned. Refer to `Ignition` documentation for information on how to start named ignite Instances.

      Returns:
        Name of the Ignite instance, or `null` for default Ignite instance.

    - #### log

          IgniteLogger log()

      Gets grid's logger.
      Returns:
        Grid's logger.

    - #### configuration

          IgniteConfiguration configuration()

      Gets the configuration of this Ignite instance.

      NOTE:
      SPIs obtains through this method should never be used directly. SPIs provide internal view on the subsystem and is used internally by Ignite kernal. In rare use cases when access to a specific implementation of this SPI is required - an instance of this SPI can be obtained via this method to check its configuration properties or call other non-SPI methods.

      Returns:
        Ignite configuration instance.

    - #### cluster

          IgniteCluster cluster()

      Gets an instance of `IgniteCluster` interface.
      Returns:
        Instance of `IgniteCluster` interface.

    - #### compute

          IgniteCompute compute()

      Gets `compute` facade over all cluster nodes started in server mode.
      Returns:
        Compute instance over all cluster nodes started in server mode.

    - #### compute

          IgniteCompute compute(ClusterGroup grp)

      Gets `compute` facade over the specified cluster group. All operations on the returned `IgniteCompute` instance will only include nodes from this cluster group.
      Parameters:
        `grp` - Cluster group.
      Returns:
        Compute instance over given cluster group.

    - #### message

          IgniteMessaging message()

      Gets `messaging` facade over all cluster nodes.
      Returns:
        Messaging instance over all cluster nodes.

    - #### message

          IgniteMessaging message(ClusterGroup grp)

      Gets `messaging` facade over nodes within the cluster group. All operations on the returned `IgniteMessaging` instance will only include nodes from the specified cluster group.
      Parameters:
        `grp` - Cluster group.
      Returns:
        Messaging instance over given cluster group.

    - #### events

          IgniteEvents events()

      Gets `events` facade over all cluster nodes.
      Returns:
        Events instance over all cluster nodes.

    - #### events

          IgniteEvents events(ClusterGroup grp)

      Gets `events` facade over nodes within the cluster group. All operations on the returned `IgniteEvents` instance will only include nodes from the specified cluster group.
      Parameters:
        `grp` - Cluster group.
      Returns:
        Events instance over given cluster group.

    - #### services

          IgniteServices services()

      Gets `services` facade over all cluster nodes started in server mode.
      Returns:
        Services facade over all cluster nodes started in server mode.

    - #### services

          IgniteServices services(ClusterGroup grp)

      Gets `services` facade over nodes within the cluster group. All operations on the returned `IgniteMessaging` instance will only include nodes from the specified cluster group.
      Parameters:
        `grp` - Cluster group.
      Returns:
        `Services` functionality over given cluster group.

    - #### executorService

          ExecutorService executorService()

      Creates a new `ExecutorService` which will execute all submitted `Callable` and `Runnable` jobs on all cluster nodes. This essentially creates a Distributed Thread Pool that can be used as a replacement for local thread pools.
      Returns:
        Grid-enabled `ExecutorService`.

    - #### executorService

          ExecutorService executorService(ClusterGroup grp)

      Creates a new `ExecutorService` which will execute all submitted `Callable` and `Runnable` jobs on nodes in the specified cluster group. This essentially creates a Distributed Thread Pool that can be used as a replacement for local thread pools.
      Parameters:
        `grp` - Cluster group.
      Returns:
        `ExecutorService` which will execute jobs on nodes in given cluster group.

    - #### version

          IgniteProductVersion version()

      Gets Ignite version.
      Returns:
        Ignite version.

    - #### scheduler

          IgniteScheduler scheduler()

      Gets an instance of cron-based scheduler.
      Returns:
        Instance of scheduler.

    - #### createCache

          <K,V> IgniteCache<K,V> createCache(CacheConfiguration<K,V> cacheCfg)
                                      throws javax.cache.CacheException

      Dynamically starts new cache with the given cache configuration.

      If local node is an affinity node, this method will return the instance of started cache. Otherwise, it will create a client cache on local node.

      If a cache with the same name already exists in the grid, an exception will be thrown regardless whether the given configuration matches the configuration of the existing cache or not.

      Parameters:
        `cacheCfg` - Cache configuration to use.
      Returns:
        Instance of started cache.
      Throws:
        `javax.cache.CacheException` - If a cache with the same name already exists or other error occurs.

    - #### createCaches

          Collection<IgniteCache> createCaches(Collection<CacheConfiguration> cacheCfgs)
                                        throws javax.cache.CacheException

      Dynamically starts new caches with the given cache configurations.

      If local node is an affinity node, this method will return the instance of started caches. Otherwise, it will create a client caches on local node.

      If for one of configurations a cache with the same name already exists in the grid, an exception will be thrown regardless whether the given configuration matches the configuration of the existing cache or not.

      Parameters:
        `cacheCfgs` - Collection of cache configuration to use.
      Returns:
        Collection of instances of started caches.
      Throws:
        `javax.cache.CacheException` - If one of created caches exists or other error occurs.

    - #### createCache

          <K,V> IgniteCache<K,V> createCache(String cacheName)
                                      throws javax.cache.CacheException

      Dynamically starts new cache using template configuration.

      If local node is an affinity node, this method will return the instance of started cache. Otherwise, it will create a client cache on local node.

      If a cache with the same name already exists in the grid, an exception will be thrown.

      Parameters:
        `cacheName` - Cache name.
      Returns:
        Instance of started cache.
      Throws:
        `javax.cache.CacheException` - If a cache with the same name already exists or other error occurs.

    - #### getOrCreateCache

          <K,V> IgniteCache<K,V> getOrCreateCache(CacheConfiguration<K,V> cacheCfg)
                                           throws javax.cache.CacheException

      Gets existing cache with the given name or creates new one with the given configuration.

      If a cache with the same name already exist, this method will not check that the given configuration matches the configuration of existing cache and will return an instance of the existing cache.

      Parameters:
        `cacheCfg` - Cache configuration to use.
      Returns:
        Existing or newly created cache.
      Throws:
        `javax.cache.CacheException` - If error occurs.

    - #### getOrCreateCache

          <K,V> IgniteCache<K,V> getOrCreateCache(String cacheName)
                                           throws javax.cache.CacheException

      Gets existing cache with the given name or creates new one using template configuration.
      Parameters:
        `cacheName` - Cache name.
      Returns:
        Existing or newly created cache.
      Throws:
        `javax.cache.CacheException` - If error occurs.

    - #### getOrCreateCaches

          Collection<IgniteCache> getOrCreateCaches(Collection<CacheConfiguration> cacheCfgs)
                                             throws javax.cache.CacheException

      Gets existing caches with the given name or created one with the given configuration.

      If a cache with the same name already exist, this method will not check that the given configuration matches the configuration of existing cache and will return an instance of the existing cache.

      Parameters:
        `cacheCfgs` - Collection of cache configuration to use.
      Returns:
        Collection of existing or newly created caches.
      Throws:
        `javax.cache.CacheException` - If error occurs.

    - #### addCacheConfiguration

          <K,V> void addCacheConfiguration(CacheConfiguration<K,V> cacheCfg)
                                    throws javax.cache.CacheException

      Adds cache configuration template.
      Parameters:
        `cacheCfg` - Cache configuration template.
      Throws:
        `javax.cache.CacheException` - If error occurs.

    - #### createCache

          <K,V> IgniteCache<K,V> createCache(CacheConfiguration<K,V> cacheCfg,
                                             NearCacheConfiguration<K,V> nearCfg)
                                      throws javax.cache.CacheException

      Dynamically starts new cache with the given cache configuration.

      If local node is an affinity node, this method will return the instance of started cache. Otherwise, it will create a near cache with the given configuration on local node.

      If a cache with the same name already exists in the grid, an exception will be thrown regardless whether the given configuration matches the configuration of the existing cache or not.

      Parameters:
        `cacheCfg` - Cache configuration to use.
        `nearCfg` - Near cache configuration to use on local node in case it is not an affinity node.
      Returns:
        Instance of started cache.
      Throws:
        `javax.cache.CacheException` - If a cache with the same name already exists or other error occurs.

    - #### getOrCreateCache

          <K,V> IgniteCache<K,V> getOrCreateCache(CacheConfiguration<K,V> cacheCfg,
                                                  NearCacheConfiguration<K,V> nearCfg)
                                           throws javax.cache.CacheException

      Gets existing cache with the given cache configuration or creates one if it does not exist.

      If a cache with the same name already exist, this method will not check that the given configuration matches the configuration of existing cache and will return an instance of the existing cache.

      If local node is not an affinity node and a client cache without near cache has been already started on this node, an exception will be thrown.

      Parameters:
        `cacheCfg` - Cache configuration.
        `nearCfg` - Near cache configuration for client.
      Returns:
        `IgniteCache` instance.
      Throws:
        `javax.cache.CacheException` - If error occurs.

    - #### createNearCache

          <K,V> IgniteCache<K,V> createNearCache(String cacheName,
                                                 NearCacheConfiguration<K,V> nearCfg)
                                          throws javax.cache.CacheException

      Starts a near cache on local node if cache was previously started with one of the `createCache(CacheConfiguration)` or `createCache(CacheConfiguration, NearCacheConfiguration)` methods.
      Parameters:
        `cacheName` - Cache name.
        `nearCfg` - Near cache configuration.
      Returns:
        Cache instance.
      Throws:
        `javax.cache.CacheException` - If error occurs.

    - #### getOrCreateNearCache

          <K,V> IgniteCache<K,V> getOrCreateNearCache(String cacheName,
                                                      NearCacheConfiguration<K,V> nearCfg)
                                               throws javax.cache.CacheException

      Gets existing near cache with the given name or creates a new one.
      Parameters:
        `cacheName` - Cache name.
        `nearCfg` - Near configuration.
      Returns:
        `IgniteCache` instance.
      Throws:
        `javax.cache.CacheException` - If error occurs.

    - #### destroyCache

          void destroyCache(String cacheName)
                     throws javax.cache.CacheException

      Stops dynamically started cache.
      Parameters:
        `cacheName` - Cache name to stop.
      Throws:
        `javax.cache.CacheException` - If error occurs.

    - #### destroyCaches

          void destroyCaches(Collection<String> cacheNames)
                      throws javax.cache.CacheException

      Stops dynamically started caches.
      Parameters:
        `cacheNames` - Collection of cache names to stop.
      Throws:
        `javax.cache.CacheException` - If error occurs.

    - #### cache

          <K,V> IgniteCache<K,V> cache(String name)
                                throws javax.cache.CacheException

      Gets an instance of `IgniteCache` API. `IgniteCache` is a fully-compatible implementation of `JCache (JSR 107)` specification.
      Parameters:
        `name` - Cache name.
      Returns:
        Instance of the cache for the specified name.
      Throws:
        `javax.cache.CacheException` - If error occurs.

    - #### cacheNames

          Collection<String> cacheNames()

      Gets the collection of names of currently available caches.
      Returns:
        Collection of names of currently available caches or an empty collection if no caches are available.

    - #### transactions

          IgniteTransactions transactions()

      Gets grid transactions facade.
      Returns:
        Grid transactions facade.

    - #### dataStreamer

          <K,V> IgniteDataStreamer<K,V> dataStreamer(String cacheName)
                                              throws IllegalStateException

      Gets a new instance of data streamer associated with given cache name. Data streamer is responsible for loading external data into in-memory data grid. For more information refer to `IgniteDataStreamer` documentation.
      Parameters:
        `cacheName` - Cache name.
      Returns:
        Data streamer.
      Throws:
        `IllegalStateException` - If node is stopping.

    - #### atomicSequence

          IgniteAtomicSequence atomicSequence(String name,
                                              long initVal,
                                              boolean create)
                                       throws IgniteException

      Will get an atomic sequence from cache and create one if it has not been created yet and `create` flag is `true`. It will use configuration from `IgniteConfiguration.getAtomicConfiguration()`.
      Parameters:
        `name` - Sequence name.
        `initVal` - Initial value for sequence. Ignored if `create` flag is `false`.
        `create` - Boolean flag indicating whether data structure should be created if does not exist.
      Returns:
        Sequence for the given name.
      Throws:
        `IgniteException` - If sequence could not be fetched or created.

    - #### atomicSequence

          IgniteAtomicSequence atomicSequence(String name,
                                              AtomicConfiguration cfg,
                                              long initVal,
                                              boolean create)
                                       throws IgniteException

      Will get an atomic sequence from cache and create one if it has not been created yet and `create` flag is `true`.
      Parameters:
        `name` - Sequence name.
        `cfg` - Configuration.
        `initVal` - Initial value for sequence. Ignored if `create` flag is `false`.
        `create` - Boolean flag indicating whether data structure should be created if does not exist.
      Returns:
        Sequence for the given name.
      Throws:
        `IgniteException` - If sequence could not be fetched or created.

    - #### atomicLong

          IgniteAtomicLong atomicLong(String name,
                                      long initVal,
                                      boolean create)
                               throws IgniteException

      Will get a atomic long from cache and create one if it has not been created yet and `create` flag is `true`.
      Parameters:
        `name` - Name of atomic long.
        `initVal` - Initial value for atomic long. Ignored if `create` flag is `false`.
        `create` - Boolean flag indicating whether data structure should be created if does not exist.
      Returns:
        Atomic long.
      Throws:
        `IgniteException` - If atomic long could not be fetched or created.

    - #### atomicLong

          IgniteAtomicLong atomicLong(String name,
                                      AtomicConfiguration cfg,
                                      long initVal,
                                      boolean create)
                               throws IgniteException

      Will get a atomic long from cache and create one if it has not been created yet and `create` flag is `true`.
      Parameters:
        `name` - Name of atomic long.
        `cfg` - Configuration.
        `initVal` - Initial value for atomic long. Ignored if `create` flag is `false`.
        `create` - Boolean flag indicating whether data structure should be created if does not exist.
      Returns:
        Atomic long.
      Throws:
        `IgniteException` - If atomic long could not be fetched or created.

    - #### atomicReference

          <T> IgniteAtomicReference<T> atomicReference(String name,
                                                       @Nullable
                                                       T initVal,
                                                       boolean create)
                                                throws IgniteException

      Will get a atomic reference from cache and create one if it has not been created yet and `create` flag is `true`. It will use configuration from `IgniteConfiguration.getAtomicConfiguration()`.
      Parameters:
        `name` - Atomic reference name.
        `initVal` - Initial value for atomic reference. Ignored if `create` flag is `false`.
        `create` - Boolean flag indicating whether data structure should be created if does not exist.
      Returns:
        Atomic reference for the given name.
      Throws:
        `IgniteException` - If atomic reference could not be fetched or created.

    - #### atomicReference

          <T> IgniteAtomicReference<T> atomicReference(String name,
                                                       AtomicConfiguration cfg,
                                                       @Nullable
                                                       T initVal,
                                                       boolean create)
                                                throws IgniteException

      Will get a atomic reference from cache and create one if it has not been created yet and `create` flag is `true`.
      Parameters:
        `name` - Atomic reference name.
        `cfg` - Configuration.
        `initVal` - Initial value for atomic reference. Ignored if `create` flag is `false`.
        `create` - Boolean flag indicating whether data structure should be created if does not exist.
      Returns:
        Atomic reference for the given name.
      Throws:
        `IgniteException` - If atomic reference could not be fetched or created.

    - #### atomicStamped

          <T,S> IgniteAtomicStamped<T,S> atomicStamped(String name,
                                                       @Nullable
                                                       T initVal,
                                                       @Nullable
                                                       S initStamp,
                                                       boolean create)
                                                throws IgniteException

      Will get a atomic stamped from cache and create one if it has not been created yet and `create` flag is `true`.
      Parameters:
        `name` - Atomic stamped name.
        `initVal` - Initial value for atomic stamped. Ignored if `create` flag is `false`.
        `initStamp` - Initial stamp for atomic stamped. Ignored if `create` flag is `false`.
        `create` - Boolean flag indicating whether data structure should be created if does not exist.
      Returns:
        Atomic stamped for the given name.
      Throws:
        `IgniteException` - If atomic stamped could not be fetched or created.

    - #### atomicStamped

          <T,S> IgniteAtomicStamped<T,S> atomicStamped(String name,
                                                       AtomicConfiguration cfg,
                                                       @Nullable
                                                       T initVal,
                                                       @Nullable
                                                       S initStamp,
                                                       boolean create)
                                                throws IgniteException

      Will get a atomic stamped from cache and create one if it has not been created yet and `create` flag is `true`.
      Parameters:
        `name` - Atomic stamped name.
        `cfg` - Configuration.
        `initVal` - Initial value for atomic stamped. Ignored if `create` flag is `false`.
        `initStamp` - Initial stamp for atomic stamped. Ignored if `create` flag is `false`.
        `create` - Boolean flag indicating whether data structure should be created if does not exist.
      Returns:
        Atomic stamped for the given name.
      Throws:
        `IgniteException` - If atomic stamped could not be fetched or created.

    - #### countDownLatch

          IgniteCountDownLatch countDownLatch(String name,
                                              int cnt,
                                              boolean autoDel,
                                              boolean create)
                                       throws IgniteException

      Gets or creates count down latch. If count down latch is not found in cache and `create` flag is `true`, it is created using provided name and count parameter.
      Parameters:
        `name` - Name of the latch.
        `cnt` - Count for new latch creation. Ignored if `create` flag is `false`.
        `autoDel` - `True` to automatically delete latch from cache when its count reaches zero. Ignored if `create` flag is `false`.
        `create` - Boolean flag indicating whether data structure should be created if does not exist.
      Returns:
        Count down latch for the given name.
      Throws:
        `IgniteException` - If latch could not be fetched or created.

    - #### semaphore

          IgniteSemaphore semaphore(String name,
                                    int cnt,
                                    boolean failoverSafe,
                                    boolean create)
                             throws IgniteException

      Gets or creates semaphore. If semaphore is not found in cache and `create` flag is `true`, it is created using provided name and count parameter.
      Parameters:
        `name` - Name of the semaphore.
        `cnt` - Count for new semaphore creation. Ignored if `create` flag is `false`.
        `failoverSafe` - `True` to create failover safe semaphore which means that if any node leaves topology permits already acquired by that node are silently released and become available for alive nodes to acquire. If flag is `false` then all threads waiting for available permits get interrupted.
        `create` - Boolean flag indicating whether data structure should be created if does not exist.
      Returns:
        Semaphore for the given name.
      Throws:
        `IgniteException` - If semaphore could not be fetched or created.

    - #### reentrantLock

          IgniteLock reentrantLock(String name,
                                   boolean failoverSafe,
                                   boolean fair,
                                   boolean create)
                            throws IgniteException

      Gets or creates reentrant lock. If reentrant lock is not found in cache and `create` flag is `true`, it is created using provided name.
      Parameters:
        `name` - Name of the lock.
        `failoverSafe` - `True` to create failover safe lock which means that if any node leaves topology, all locks already acquired by that node are silently released and become available for other nodes to acquire. If flag is `false` then all threads on other nodes waiting to acquire lock are interrupted.
        `fair` - If `True`, fair lock will be created.
        `create` - Boolean flag indicating whether data structure should be created if does not exist.
      Returns:
        ReentrantLock for the given name.
      Throws:
        `IgniteException` - If reentrant lock could not be fetched or created.

    - #### queue

          <T> IgniteQueue<T> queue(String name,
                                   int cap,
                                   @Nullable
                                   @Nullable CollectionConfiguration cfg)
                            throws IgniteException

      Will get a named queue from cache and create one if it has not been created yet and `cfg` is not `null`. If queue is present already, queue properties will not be changed. Use collocation for `CacheMode.PARTITIONED` caches if you have lots of relatively small queues as it will make fetching, querying, and iteration a lot faster. If you have few very large queues, then you should consider turning off collocation as they simply may not fit in a single node's memory.
      Parameters:
        `name` - Name of queue.
        `cap` - Capacity of queue, `0` for unbounded queue. Ignored if `cfg` is `null`.
        `cfg` - Queue configuration if new queue should be created.
      Returns:
        Queue with given properties.
      Throws:
        `IgniteException` - If queue could not be fetched or created.

    - #### set

          <T> IgniteSet<T> set(String name,
                               @Nullable
                               @Nullable CollectionConfiguration cfg)
                        throws IgniteException

      Will get a named set from cache and create one if it has not been created yet and `cfg` is not `null`.
      Parameters:
        `name` - Set name.
        `cfg` - Set configuration if new set should be created.
      Returns:
        Set with given properties.
      Throws:
        `IgniteException` - If set could not be fetched or created.

    - #### plugin

          <T extends IgnitePlugin> T plugin(String name)
                                     throws PluginNotFoundException

      Gets an instance of deployed Ignite plugin.
      Type Parameters:
        `T` - Plugin type.
      Parameters:
        `name` - Plugin name.
      Returns:
        Plugin instance.
      Throws:
        `PluginNotFoundException` - If plugin for the given name was not found.

    - #### binary

          IgniteBinary binary()

      Gets an instance of `IgniteBinary` interface.
      Returns:
        Instance of `IgniteBinary` interface.

    - #### close

          void close()
              throws IgniteException

      Closes `this` instance of grid. This method is identical to calling `G.stop(igniteInstanceName, true)`.

      The method is invoked automatically on objects managed by the `try-with-resources` statement.

      Specified by:
        `close` in interface `AutoCloseable`
      Throws:
        `IgniteException` - If failed to stop grid.

    - #### affinity

          <K> Affinity<K> affinity(String cacheName)

      Gets affinity service to provide information about data partitioning and distribution.
      Type Parameters:
        `K` - Cache key type.
      Parameters:
        `cacheName` - Cache name.
      Returns:
        Affinity.

    - #### active

          @Deprecated
          boolean active()

      Deprecated. Use `IgniteCluster.active()` instead.
      Checks Ignite grid is active or not active.
      Returns:
        `True` if grid is active. `False` If grid is not active.

    - #### active

          @Deprecated
          void active(boolean active)

      Deprecated. Use `IgniteCluster.active(boolean)` instead.
      Changes Ignite grid state to active or inactive.

      NOTE: Deactivation clears in-memory caches (without persistence) including the system caches.

      Parameters:
        `active` - If `True` start activation process. If `False` start deactivation process.
      Throws:
        `IgniteException` - If there is an already started transaction or lock in the same thread.

    - #### resetLostPartitions

          void resetLostPartitions(Collection<String> cacheNames)

      Clears partition's lost state and moves caches to a normal mode.

      To avoid permanent data loss for persistent caches it's recommended to return all previously failed baseline nodes to the topology before calling this method.

    - #### memoryMetrics

          @Deprecated
          Collection<MemoryMetrics> memoryMetrics()

      Deprecated. Use `dataRegionMetrics()` instead.
      Returns:
        Collection of `MemoryMetrics` snapshots.

    - #### memoryMetrics

          @Deprecated
           @Nullable
          @Nullable MemoryMetrics memoryMetrics(String memPlcName)

      Deprecated. Use `dataRegionMetrics(String)` instead.
      Returns:
        `MemoryMetrics` snapshot or `null` if no memory region is configured under specified name.

    - #### persistentStoreMetrics

          @Deprecated
          PersistenceMetrics persistentStoreMetrics()

      Deprecated. Use `dataStorageMetrics()` instead.
      Returns:
        `PersistenceMetrics` snapshot.

    - #### dataRegionMetrics

          Collection<DataRegionMetrics> dataRegionMetrics()

      Returns a collection of `DataRegionMetrics` that reflects page memory usage on this Apache Ignite node instance. Returns the collection that contains the latest snapshots for each memory region configured with `configuration` on this Ignite node instance.
      Returns:
        Collection of `DataRegionMetrics` snapshots.

    - #### dataRegionMetrics

          @Nullable
          @Nullable DataRegionMetrics dataRegionMetrics(String memPlcName)

      Returns the latest `DataRegionMetrics` snapshot for the memory region of the given name. To get the metrics for the default memory region use `DataStorageConfiguration.DFLT_DATA_REG_DEFAULT_NAME` as the name or a custom name if the default memory region has been renamed.
      Parameters:
        `memPlcName` - Name of memory region configured with `config`.
      Returns:
        `DataRegionMetrics` snapshot or `null` if no memory region is configured under specified name.

    - #### dataStorageMetrics

          DataStorageMetrics dataStorageMetrics()

      Returns:
        `DataStorageMetrics` snapshot.

    - #### encryption

          IgniteEncryption encryption()

      Gets an instance of `IgniteEncryption` interface.
      Returns:
        Instance of `IgniteEncryption` interface.

    - #### snapshot

          IgniteSnapshot snapshot()

      Returns:
        Snapshot manager.

    - #### tracingConfiguration

          @NotNull
          @NotNull TracingConfigurationManager tracingConfiguration()

      Returns the `TracingConfigurationManager` instance that allows to
      - Configure tracing parameters such as sampling rate for the specific tracing coordinates such as scope and label.
      - Retrieve the most specific tracing parameters for the specified tracing coordinates (scope and label)
      - Restore the tracing parameters for the specified tracing coordinates to the default.
      - List all pairs of tracing configuration coordinates and tracing configuration parameters.
      Returns:
        `TracingConfigurationManager` instance.

2020 Copyright © Apache Software Foundation
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Ignite Database and Caching Platform | : ver. 2.9.1
Release Date | : December 9 2020