Package com.inductiveautomation.perspective.gateway.binding.transforms

Class AbstractSynchronousTransform

java.lang.Object

com.inductiveautomation.perspective.gateway.binding.transforms.AbstractSynchronousTransform

All Implemented Interfaces:

Transform

Direct Known Subclasses:

AbstractMapTransform, ScriptTransform

public abstract class AbstractSynchronousTransform
extends java.lang.Object
implements Transform

An Transform which takes care of wrapping a blocking transform operation in a CompletableFuture. Implementations only need to override synchronousTransformInternal(QualifiedValue) to process their blocking transform work.

Constructor Summary

Constructors

Constructor	Description
AbstractSynchronousTransform()

Method Summary

Modifier and Type	Method	Description
protected abstract QualifiedValue	synchronousTransformInternal(QualifiedValue value)	Perform a blocking transformation on a QualifiedValue, returning the transformed value as a QualifiedValue.
java.util.concurrent.CompletableFuture<QualifiedValue>	transform(QualifiedValue value)	When the binding or previous transform emits a value, it will be given to this method.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.inductiveautomation.perspective.gateway.api.Transform

resolveReferences, shutdown, startup

Constructor Detail

AbstractSynchronousTransform

public AbstractSynchronousTransform()

Method Detail

synchronousTransformInternal

protected abstract QualifiedValue synchronousTransformInternal(@Nonnull
                                                               QualifiedValue value)
                                                        throws java.lang.Throwable

Perform a blocking transformation on a QualifiedValue, returning the transformed value as a QualifiedValue.

Parameters:

value - The input value to transform. The value will never be null.

Returns:

The transformed value.

Throws:

java.lang.Throwable - If there is any Exception or Error in the transformation.

transform

public java.util.concurrent.CompletableFuture<QualifiedValue> transform(@Nonnull
                                                                        QualifiedValue value)
                                                                 throws java.lang.Throwable

Description copied from interface: Transform

When the binding or previous transform emits a value, it will be given to this method. The expectation is that the transform will then push the transformed value onto the callback given to it in the factory

Specified by:

transform in interface Transform

Parameters:

value - The input value to the Transform. It could be the output value of the binding itself if the transform is first in the chain, or it could be a transformed value if it is after the first in the chain. The input QualifiedValue can never be null (though the value it wraps can be null)

Throws:

java.lang.Throwable - If there is a problem with the transformation