Package uk.gov.gchq.gaffer.operation

Interface Operation

All Superinterfaces:

AutoCloseable, Closeable

All Known Subinterfaces:

ExportTo<T>, IFederatedOperation, IFederationOperation, Input<I>, InputOutput<I,O>, MultiElementIdInput, MultiEntityIdInput, MultiInput<I_ITEM>, Output<O>

All Known Implementing Classes:

AddElements, AddElementsFromFile, AddElementsFromHdfs, AddElementsFromKafka, AddElementsFromSocket, AddGraph, AddGraph, AddGraphWithHooks, AddNamedOperation, AddNamedView, AddSchemaToLibrary, AddStorePropertiesToLibrary, Aggregate, CancelScheduledJob, ChangeGraphAccess, ChangeGraphAccess, ChangeGraphId, ChangeGraphId, Count, CountAllElementsDefaultView, CountGroups, DeleteAllData, DeleteElements, DeleteNamedOperation, DeleteNamedView, DiscardOutput, ExportToGafferResultCache, ExportToLocalFile, ExportToOtherAuthorisedGraph, ExportToOtherGraph, ExportToSet, FederatedOperation, Filter, ForEach, GenerateElements, GenerateObjects, GenerateSplitPointsFromSample, GenericInput, GetAdjacentIds, GetAllElements, GetAllGraphIds, GetAllGraphIds, GetAllGraphInfo, GetAllGraphInfo, GetAllJobDetails, GetAllNamedOperations, GetAllNamedViews, GetDataFrameOfElements, GetElements, GetElementsBetweenSets, GetElementsBetweenSetsPairs, GetElementsInRanges, GetElementsWithinSet, GetExports, GetFromEndpoint, GetGafferResultCacheExport, GetGraphCreatedTime, GetGraphFrameOfElements, GetJavaRDDOfAllElements, GetJavaRDDOfElements, GetJavaRDDOfElementsInRanges, GetJobDetails, GetJobResults, GetProxyProperties, GetProxyUrl, GetRDDOfAllElements, GetRDDOfElements, GetRDDOfElementsInRanges, GetSchema, GetSetExport, GetTraits, GetVariable, GetVariables, GetWalks, HasTrait, If, ImportAccumuloKeyValueFiles, ImportFromLocalFile, ImportJavaRDDOfElements, ImportKeyValueJavaPairRDDToAccumulo, ImportKeyValuePairRDDToAccumulo, ImportRDDOfElements, Join, Limit, Map, Max, Min, NamedOperation, OperationChain, OperationChainDAO, Reduce, RemoveGraph, RemoveGraph, RemoveGraphAndDeleteAllData, SampleDataForSplitPoints, SampleElementsForSplitPoints, ScoreOperationChain, SetVariable, Sort, SplitStoreFromFile, SplitStoreFromIterable, SplitStoreFromJavaRDDOfElements, SplitStoreFromRDDOfElements, SummariseGroupOverRanges, ToArray, ToCsv, ToEntitySeeds, ToList, ToMap, ToSet, ToSingletonList, ToStream, ToVertices, Transform, Validate, ValidateOperationChain, While

public interface Operation
extends Closeable

An Operation defines an operation to be processed on a graph. All operations must to implement this interface. Operations should be written to be as generic as possible to allow them to be applied to different graph/stores. NOTE - operations should not contain the operation logic. The logic should be separated out into a operation handler. This will allow you to execute the same operation on different stores with different handlers.

Operations must be JSON serialisable in order to make REST API calls.

Any fields that are required should be annotated with the Required annotation.

Operation implementations need to implement this Operation interface and any of the following interfaces they wish to make use of: Input Output InputOutput (Use this instead of Input and Output if your operation takes both input and output.) MultiInput (Use this in addition if you operation takes multiple inputs. This will help with json serialisation) Validatable OperationView GraphFilters SeededGraphFilters

Each Operation implementation should have a corresponding unit test class that extends the OperationTest class.

Implementations should override the close method and ensure all closeable fields are closed.

All implementations should also have a static inner Builder class that implements the required builders. For example:

 public static class Builder extends Operation.BaseBuilder<GetElements, Builder>
         implements InputOutput.Builder<GetElements, Iterable<? extends ElementId>, Iterable<? extends Element>, Builder>,
         MultiInput.Builder<GetElements, ElementId, Builder>,
         SeededGraphFilters.Builder<GetElements, Builder> {
     public Builder() {
             super(new GetElements());
     }
 }
 

Nested Class Summary

Nested Classes

Modifier and Type	Interface	Description
static class	Operation.BaseBuilder<OP extends Operation,B extends Operation.BaseBuilder<OP,?>>
static interface	Operation.Builder<OP,B extends Operation.Builder<OP,?>>

Method Summary

Modifier and Type	Method	Description
default Map<String,String>	_getNullOrOptions()
default void	addOption(String name, String value)	Adds an operation option.
default void	close()	Operation implementations should ensure that all closeable fields are closed in this method.
default boolean	containsOption(String name)	Gets if an operation contains an option of the given name.
default String	getOption(String name)	Gets an operation option by its given name.
default String	getOption(String name, String defaultValue)	Gets an operation option by its given name.
Map<String,String>	getOptions()
void	setOptions(Map<String,String> options)
Operation	shallowClone()	Operation implementations should ensure a ShallowClone method is implemented.
default uk.gov.gchq.koryphe.ValidationResult	validate()	Validates an operation.
default void	validateRequiredFieldPresent(uk.gov.gchq.koryphe.ValidationResult result, Field field)

Method Detail

shallowClone

Operation shallowClone()
                throws org.apache.commons.lang3.exception.CloneFailedException

Operation implementations should ensure a ShallowClone method is implemented. Performs a shallow clone. Creates a new instance and copies the fields across. It does not clone the fields. If the operation contains nested operations, these must also be cloned.

Returns:

shallow clone

Throws:

org.apache.commons.lang3.exception.CloneFailedException - if a Clone error occurs

getOptions

Map<String,String> getOptions()

Returns:

the operation options. This may contain store specific options such as authorisation strings or and other properties required for the operation to be executed. Note these options will probably not be interpreted in the same way by every store implementation.

setOptions

void setOptions(Map<String,String> options)

Parameters:

options - the operation options. This may contain store specific options such as authorisation strings or and other properties required for the operation to be executed. Note these options will probably not be interpreted in the same way by every store implementation.

addOption

default void addOption(String name,
                       String value)

Adds an operation option. This may contain store specific options such as authorisation strings or and other properties required for the operation to be executed. Note these options will probably not be interpreted in the same way by every store implementation.

Parameters:

name - the name of the option

value - the value of the option

getOption

default String getOption(String name)

Gets an operation option by its given name.

Parameters:

name - the name of the option

Returns:

the value of the option

getOption

default String getOption(String name,
                         String defaultValue)

Gets an operation option by its given name.

Parameters:

name - the name of the option

defaultValue - the default value to return if value is null.

Returns:

the value of the option

containsOption

default boolean containsOption(String name)

Gets if an operation contains an option of the given name.

Parameters:

name - the name of the option

Returns:

if the operation contains the option

_getNullOrOptions

default Map<String,String> _getNullOrOptions()

close

default void close()
            throws IOException

Operation implementations should ensure that all closeable fields are closed in this method.

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Throws:

IOException - if an I/O error occurs

validate

default uk.gov.gchq.koryphe.ValidationResult validate()

Validates an operation. This should be used to validate that fields have been be configured correctly. By default no validation is applied. Override this method to implement validation.

Returns:

validation result.

validateRequiredFieldPresent

default void validateRequiredFieldPresent(uk.gov.gchq.koryphe.ValidationResult result,
                                          Field field)