ProcessorMetaSupplier (Hazelcast Root 5.3.8 API)

All Superinterfaces:

Serializable

All Known Implementing Classes:

ProcessorMetaSupplier.RandomMemberPms, ProcessorMetaSupplier.SpecificMemberPms

Functional Interface:

This is a functional interface and can therefore be used as the assignment target for a lambda expression or method reference.
```
@FunctionalInterface
public interface ProcessorMetaSupplier
extends Serializable
```
Factory of ProcessorSupplier instances. The starting point of the chain leading to the eventual creation of Processor instances on each cluster member:
1. client or member creates ProcessorMetaSupplier as a part of the DAG;
2. client or member sends it to the job coordinator (if the member is job coordinator and the DAG consists of reusable ProcessorMetaSuppliers, the serialization may be skipped);
3. the job coordinator uses it to create one ProcessorSupplier for each cluster member;
4. serializes each ProcessorSupplier and sends it to its target member;
5. the target member deserializes and uses it to instantiate as many instances of Processor as requested by the parallelism property on the corresponding Vertex.
Before being asked to create ProcessorSuppliers this meta-supplier will be given access to the Hazelcast instance and, in particular, its cluster topology and partitioning services. It can use the information from these services to precisely parameterize each Processor instance that will be created on each member.
Since:

Jet 3.0

Nested Class Summary

Nested Classes
Modifier and Type	Interface and Description
`static interface`	`ProcessorMetaSupplier.Context` Context passed to the meta-supplier at init time on the member that received a job request from the client.
`static class`	`ProcessorMetaSupplier.ExpectNothingProcessorSupplier`
`static class`	`ProcessorMetaSupplier.RandomMemberPms`
`static class`	`ProcessorMetaSupplier.SpecificMemberPms` A meta-supplier that will only use the given `ProcessorSupplier` on a node with given `Address`.

Method Summary

All Methods Static Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method and Description
`default void`	`close(Throwable error)` Called on coordinator member after execution has finished on all members, successfully or not.
`default boolean`	`closeIsCooperative()` Returns `true` if the `close(Throwable)` method of this instance is cooperative.
`static ProcessorMetaSupplier`	`forceTotalParallelismOne(ProcessorSupplier supplier)` Variant of `forceTotalParallelismOne(ProcessorSupplier, String, Permission)` where the node for the supplier will be chosen randomly and without any required permission.
`static ProcessorMetaSupplier`	`forceTotalParallelismOne(ProcessorSupplier supplier, Address memberAddress)` Wraps the provided `ProcessorSupplier` into a meta-supplier that will only use the given `ProcessorSupplier` on a node with the given `Address`.
`static ProcessorMetaSupplier`	`forceTotalParallelismOne(ProcessorSupplier supplier, Permission permission)` Variant of `forceTotalParallelismOne(ProcessorSupplier, String, Permission)` where the node for the supplier will be chosen randomly.
`static ProcessorMetaSupplier`	`forceTotalParallelismOne(ProcessorSupplier supplier, String partitionKey)` Variant of `forceTotalParallelismOne(ProcessorSupplier, String, Permission)` without any required permission.
`static ProcessorMetaSupplier`	`forceTotalParallelismOne(ProcessorSupplier supplier, String partitionKey, Permission permission)` Wraps the provided `ProcessorSupplier` into a meta-supplier that will only use the given `ProcessorSupplier` on a single node.
`Function<? super Address,? extends ProcessorSupplier>`	`get(List<Address> addresses)` Called to create a mapping from member `Address` to the `ProcessorSupplier` that will be sent to that member.
`default Permission`	`getRequiredPermission()` Returns the required permission to execute the vertex which has this ProcessorMetaSupplier.
`default Map<String,String>`	`getTags()` Returns the metadata on this supplier, a string-to-string map.
`default void`	`init(ProcessorMetaSupplier.Context context)` Called on the cluster member that receives the job request.
`default boolean`	`initIsCooperative()` Returns `true` if both the `init(Context)` and `get(List)` methods of this instance are cooperative.
`default boolean`	`isReusable()` Returns `true` if the same instance can be reused in different job executions or in different vertices.
`static ProcessorMetaSupplier`	`of(FunctionEx<? super Address,? extends ProcessorSupplier> addressToSupplier)` Factory method that creates a `ProcessorMetaSupplier` from the supplied function that maps a cluster member address to a `ProcessorSupplier`.
`static ProcessorMetaSupplier`	`of(int preferredLocalParallelism, FunctionEx<? super Address,? extends ProcessorSupplier> addressToSupplier)` Factory method that creates a `ProcessorMetaSupplier` from the supplied function that maps a cluster member address to a `ProcessorSupplier`.
`static ProcessorMetaSupplier`	`of(int preferredLocalParallelism, Permission permission, ProcessorSupplier procSupplier)` Factory method that wraps the given `ProcessorSupplier` and returns the same instance for each given `Address`.
`static ProcessorMetaSupplier`	`of(int preferredLocalParallelism, ProcessorSupplier procSupplier)` Variant of `of(int, Permission, ProcessorSupplier)` where the processor does not require any permission to run.
`static ProcessorMetaSupplier`	`of(int preferredLocalParallelism, SupplierEx<? extends Processor> procSupplier)` Factory method that wraps the given `Supplier<Processor>` and uses it as the supplier of all `Processor` instances.
`static ProcessorMetaSupplier`	`of(Permission permission, ProcessorSupplier procSupplier)` Wraps the provided `ProcessorSupplier` into a meta-supplier that will always return it.
`static ProcessorMetaSupplier`	`of(ProcessorSupplier procSupplier)` Variant of `of(Permission, ProcessorSupplier)` where the processor does not require any permission to run.
`static ProcessorMetaSupplier`	`of(SupplierEx<? extends Processor> procSupplier)` Factory method that wraps the given `Supplier<Processor>` and uses it as the supplier of all `Processor` instances.
`static ProcessorMetaSupplier`	`preferLocalParallelismOne(Permission permission, ProcessorSupplier supplier)` Variant of `preferLocalParallelismOne(ProcessorSupplier)` where the processor requires given permission to run.
`static ProcessorMetaSupplier`	`preferLocalParallelismOne(Permission permission, SupplierEx<? extends Processor> procSupplier)` Variant of `preferLocalParallelismOne(SupplierEx)` where the processor requires given permission to run.
`static ProcessorMetaSupplier`	`preferLocalParallelismOne(ProcessorSupplier supplier)` Wraps the provided `ProcessorSupplier` into a meta-supplier that will always return it.
`static ProcessorMetaSupplier`	`preferLocalParallelismOne(SupplierEx<? extends Processor> procSupplier)` Variant of `preferLocalParallelismOne(ProcessorSupplier)` where the supplied `SupplierEx<Processor>` will be wrapped into a `ProcessorSupplier`.
`default int`	`preferredLocalParallelism()` Returns the local parallelism the vertex should be configured with.
`static ProcessorMetaSupplier`	`randomMember(ProcessorSupplier supplier)` Wraps the provided `ProcessorSupplier` into a meta-supplier that will only use the given `ProcessorSupplier` on a random node

- Method Detail
  - getRequiredPermission
```
@Nullable
default Permission getRequiredPermission()
```
    Returns the required permission to execute the vertex which has this ProcessorMetaSupplier. This is an Enterprise feature.
  - getTags
```
@Nonnull
default Map<String,String> getTags()
```
    Returns the metadata on this supplier, a string-to-string map. There is no predefined metadata; this facility exists to allow the DAG vertices to contribute some information to the execution planning phase.
    
    Since:
    
    Jet 4.0
  - preferredLocalParallelism
```
default int preferredLocalParallelism()
```
    Returns the local parallelism the vertex should be configured with. The default implementation returns Vertex.LOCAL_PARALLELISM_USE_DEFAULT.
  - init
```
default void init(@Nonnull
                  ProcessorMetaSupplier.Context context)
           throws Exception
```
    Called on the cluster member that receives the job request. Gives access to the Hazelcast instance's services and provides the parallelism parameters determined from the cluster size.
    
    Throws:
    
    Exception
    
    See Also:
    
    isReusable()
  - initIsCooperative
```
default boolean initIsCooperative()
```
    Returns true if both the init(Context) and get(List) methods of this instance are cooperative. If they are not, the call to the init() and get() method is off-loaded to another thread.
    
    Since:
    
    5.2
  - get
```
@Nonnull
Function<? super Address,? extends ProcessorSupplier> get(@Nonnull
                                                                   List<Address> addresses)
```
    Called to create a mapping from member Address to the ProcessorSupplier that will be sent to that member. Jet calls this method with a list of all cluster members' addresses and the returned function must be a mapping that returns a non-null value for each given address.
    The method will be called once per job execution on the job's coordinator member. init() will have already been called.
    
    See Also:
    
    isReusable()
  - closeIsCooperative
```
default boolean closeIsCooperative()
```
    Returns true if the close(Throwable) method of this instance is cooperative. If it's not, the call to the close() method is off-loaded to another thread.
    
    Since:
    
    5.2
  - close
```
default void close(@Nullable
                   Throwable error)
            throws Exception
```
    Called on coordinator member after execution has finished on all members, successfully or not. This method will be called after ProcessorSupplier.close(Throwable) has been called on all available members. The job can be restarted later.
    If there is an exception during the creation of the execution plan, this method will be called regardless of whether the init() or get() method have been called or not. If this method throws an exception, it will be logged and ignored; it won't be reported as a job failure.
    If you rely on the fact that this method is run once per cluster, it can happen that it is not called at all, if the coordinator member crashed. It can be also called multiple times, if the job restarts.
    
    Parameters:
    
    error - the exception (if any) that caused the job to fail; null in the case of successful job completion. Note that it might not be the actual error that caused the job to fail - it can be several other exceptions. We only guarantee that it's non-null if the job didn't complete successfully.
    
    Throws:
    
    Exception
    
    See Also:
    
    isReusable()
  - isReusable
```
default boolean isReusable()
```
    Returns true if the same instance can be reused in different job executions or in different vertices. In that case, init(com.hazelcast.jet.core.ProcessorMetaSupplier.Context), get(java.util.List<com.hazelcast.cluster.Address>) and close(java.lang.Throwable) methods must be thread-safe and obey additional conditions defined below.
    When a job is submitted from a client, the job definition is serialized, so the job coordinator will receive a different copy of processor meta-suppliers even if they are used multiple times within the same DAG, or across different DAGs, or submitted through different jobs. While this serialization mechanism ensures that processor meta-supplier instances do not share any internal state, it is unnecessary —and avoided— for jobs consisting of reusable meta-suppliers and submitted from the job coordinator —which is always the case for member-originated light jobs.
    Non-reusable meta-suppliers (default) have a simple order of method executions: init(com.hazelcast.jet.core.ProcessorMetaSupplier.Context) (once), get(java.util.List<com.hazelcast.cluster.Address>) (at most once after init(com.hazelcast.jet.core.ProcessorMetaSupplier.Context), close(java.lang.Throwable) (last).
    Reusable meta-suppliers differ because the meta supplier instance may be shared and reused. That is why:
    1. init(com.hazelcast.jet.core.ProcessorMetaSupplier.Context) can be invoked multiple times (also after close(java.lang.Throwable)).
    2. get(java.util.List<com.hazelcast.cluster.Address>) can be invoked multiple times, but each get(java.util.List<com.hazelcast.cluster.Address>) invocation will be preceded by init(com.hazelcast.jet.core.ProcessorMetaSupplier.Context) invocation for given job execution.
    3. close(java.lang.Throwable) can be invoked multiple times with or without preceding invocations of the other methods.
    4. Meta-supplier method invocation sequences for different concurrent job executions may be interleaved.
    It is recommended that reusable meta-supplier does not have any mutable state that is changed by any of the methods. It is, however, allowed to initialize some thread-safe constant fields in init(com.hazelcast.jet.core.ProcessorMetaSupplier.Context) method, for example, save some constant data from ProcessorMetaSupplier.Context for further usage. Note, however, that cluster topology may change and should not be stored.
    Since:
    
    5.3
  - of
```
@Nonnull
static ProcessorMetaSupplier of(int preferredLocalParallelism,
                                         @Nullable
                                         Permission permission,
                                         @Nonnull
                                         ProcessorSupplier procSupplier)
```
    Factory method that wraps the given ProcessorSupplier and returns the same instance for each given Address.
    
    Parameters:
    
    preferredLocalParallelism - the value to return from preferredLocalParallelism()
    
    permission - the required permission to run the processor
    
    procSupplier - the processor supplier
  - of
```
@Nonnull
static ProcessorMetaSupplier of(int preferredLocalParallelism,
                                         @Nonnull
                                         ProcessorSupplier procSupplier)
```
    Variant of of(int, Permission, ProcessorSupplier) where the processor does not require any permission to run.
  - of
```
@Nonnull
static ProcessorMetaSupplier of(@Nullable
                                         Permission permission,
                                         @Nonnull
                                         ProcessorSupplier procSupplier)
```
    Wraps the provided ProcessorSupplier into a meta-supplier that will always return it. The preferredLocalParallelism() of the meta-supplier will be Vertex.LOCAL_PARALLELISM_USE_DEFAULT.
  - of
```
@Nonnull
static ProcessorMetaSupplier of(@Nonnull
                                         ProcessorSupplier procSupplier)
```
    Variant of of(Permission, ProcessorSupplier) where the processor does not require any permission to run.
  - of
```
@Nonnull
static ProcessorMetaSupplier of(int preferredLocalParallelism,
                                         @Nonnull
                                         SupplierEx<? extends Processor> procSupplier)
```
    Factory method that wraps the given Supplier<Processor> and uses it as the supplier of all Processor instances. Specifically, returns a meta-supplier that will always return the result of calling ProcessorSupplier.of(SupplierEx).
    
    Parameters:
    
    preferredLocalParallelism - the value to return from preferredLocalParallelism()
    
    procSupplier - the supplier of processors
  - of
```
@Nonnull
static ProcessorMetaSupplier of(@Nonnull
                                         SupplierEx<? extends Processor> procSupplier)
```
    Factory method that wraps the given Supplier<Processor> and uses it as the supplier of all Processor instances. Specifically, returns a meta-supplier that will always return the result of calling ProcessorSupplier.of(SupplierEx). The preferredLocalParallelism() of the meta-supplier will be Vertex.LOCAL_PARALLELISM_USE_DEFAULT.
  - of
```
@Nonnull
static ProcessorMetaSupplier of(int preferredLocalParallelism,
                                         @Nonnull
                                         FunctionEx<? super Address,? extends ProcessorSupplier> addressToSupplier)
```
    Factory method that creates a ProcessorMetaSupplier from the supplied function that maps a cluster member address to a ProcessorSupplier.
    
    Parameters:
    
    preferredLocalParallelism - the value to return from preferredLocalParallelism()
    
    addressToSupplier - the mapping from address to ProcessorSupplier
  - of
```
@Nonnull
static ProcessorMetaSupplier of(@Nonnull
                                         FunctionEx<? super Address,? extends ProcessorSupplier> addressToSupplier)
```
    Factory method that creates a ProcessorMetaSupplier from the supplied function that maps a cluster member address to a ProcessorSupplier. The preferredLocalParallelism() of the meta-supplier will be Vertex.LOCAL_PARALLELISM_USE_DEFAULT.
  - preferLocalParallelismOne
```
@Nonnull
static ProcessorMetaSupplier preferLocalParallelismOne(@Nonnull
                                                                ProcessorSupplier supplier)
```
    Wraps the provided ProcessorSupplier into a meta-supplier that will always return it. The preferredLocalParallelism() of the meta-supplier will be one, i.e., no local parallelization.
    The parallelism will be overridden if the Vertex.localParallelism(int) is set to a specific value.
  - preferLocalParallelismOne
```
@Nonnull
static ProcessorMetaSupplier preferLocalParallelismOne(@Nullable
                                                                Permission permission,
                                                                @Nonnull
                                                                ProcessorSupplier supplier)
```
    Variant of preferLocalParallelismOne(ProcessorSupplier) where the processor requires given permission to run.
  - preferLocalParallelismOne
```
@Nonnull
static ProcessorMetaSupplier preferLocalParallelismOne(@Nonnull
                                                                SupplierEx<? extends Processor> procSupplier)
```
    Variant of preferLocalParallelismOne(ProcessorSupplier) where the supplied SupplierEx<Processor> will be wrapped into a ProcessorSupplier.
  - preferLocalParallelismOne
```
@Nonnull
static ProcessorMetaSupplier preferLocalParallelismOne(@Nullable
                                                                Permission permission,
                                                                @Nonnull
                                                                SupplierEx<? extends Processor> procSupplier)
```
    Variant of preferLocalParallelismOne(SupplierEx) where the processor requires given permission to run.
  - forceTotalParallelismOne
```
@Nonnull
static ProcessorMetaSupplier forceTotalParallelismOne(@Nonnull
                                                               ProcessorSupplier supplier,
                                                               @Nullable
                                                               Permission permission)
```
    Variant of forceTotalParallelismOne(ProcessorSupplier, String, Permission) where the node for the supplier will be chosen randomly.
  - forceTotalParallelismOne
```
@Nonnull
static ProcessorMetaSupplier forceTotalParallelismOne(@Nonnull
                                                               ProcessorSupplier supplier)
```
    Variant of forceTotalParallelismOne(ProcessorSupplier, String, Permission) where the node for the supplier will be chosen randomly and without any required permission.
  - forceTotalParallelismOne
```
@Nonnull
static ProcessorMetaSupplier forceTotalParallelismOne(@Nonnull
                                                               ProcessorSupplier supplier,
                                                               @Nonnull
                                                               String partitionKey)
```
    Variant of forceTotalParallelismOne(ProcessorSupplier, String, Permission) without any required permission.
  - forceTotalParallelismOne
```
@Nonnull
static ProcessorMetaSupplier forceTotalParallelismOne(@Nonnull
                                                               ProcessorSupplier supplier,
                                                               @Nonnull
                                                               String partitionKey,
                                                               @Nullable
                                                               Permission permission)
```
    Wraps the provided ProcessorSupplier into a meta-supplier that will only use the given ProcessorSupplier on a single node. The node will be chosen according to the partitionKey supplied. This is mainly provided as a convenience for implementing non-distributed sources where data can't be read in parallel by multiple consumers. When used as a sink or intermediate vertex, the DAG should ensure that only the processor instance on the designated node receives any data, otherwise an IllegalStateException will be thrown.
    The vertex containing the ProcessorMetaSupplier must have a local parallelism setting of 1, otherwise {code IllegalArgumentException} is thrown.
    
    Parameters:
    
    supplier - the supplier that will be wrapped
    
    partitionKey - the supplier will only be created on the node that owns the supplied partition key
    
    permission - the required permission to run the processor
    
    Returns:
    
    the wrapped ProcessorMetaSupplier
    
    Throws:
    
    IllegalArgumentException - if vertex has local parallelism setting of greater than 1
  - forceTotalParallelismOne
```
@Nonnull
static ProcessorMetaSupplier forceTotalParallelismOne(@Nonnull
                                                               ProcessorSupplier supplier,
                                                               @Nonnull
                                                               Address memberAddress)
```
    Wraps the provided ProcessorSupplier into a meta-supplier that will only use the given ProcessorSupplier on a node with the given Address. This is mainly provided as a convenience for implementing non-distributed sources where data can't be read in parallel by multiple consumers. When used as a sink or intermediate vertex, the DAG should ensure that only the processor instance on the designated node receives any data, otherwise an IllegalStateException will be thrown.
    The vertex containing the ProcessorMetaSupplier must have a local parallelism setting of 1, otherwise {code IllegalArgumentException} is thrown.
    
    Parameters:
    
    supplier - the supplier that will be wrapped
    
    memberAddress - the supplier will only be created on the node with given Address
    
    Returns:
    
    the wrapped ProcessorMetaSupplier
    
    Throws:
    
    IllegalArgumentException - if vertex has local parallelism setting of greater than 1
  - randomMember
```
@Nonnull
 @Beta
static ProcessorMetaSupplier randomMember(@Nonnull
                                                          ProcessorSupplier supplier)
```
    Wraps the provided ProcessorSupplier into a meta-supplier that will only use the given ProcessorSupplier on a random node
    
    Parameters:
    
    supplier - the supplier that will be wrapped
    
    Returns:
    
    the wrapped ProcessorMetaSupplier
    
    Since:
    
    5.3

Interface ProcessorMetaSupplier

Nested Class Summary

Method Summary

Method Detail

getRequiredPermission

getTags

preferredLocalParallelism

init

initIsCooperative

get

closeIsCooperative

close

isReusable

of

of

of

of

of

of

of

of

preferLocalParallelismOne

preferLocalParallelismOne

preferLocalParallelismOne

preferLocalParallelismOne

forceTotalParallelismOne

forceTotalParallelismOne

forceTotalParallelismOne

forceTotalParallelismOne

forceTotalParallelismOne

randomMember