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EnforcementTask.java
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EnforcementTask.java
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/*
* Copyright (c) 2022 Contributors to the Eclipse Foundation
*
* See the NOTICE file(s) distributed with this work for additional
* information regarding copyright ownership.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0
*
* SPDX-License-Identifier: EPL-2.0
*/
package org.eclipse.ditto.policies.enforcement;
import java.util.concurrent.CompletionStage;
import java.util.function.Supplier;
import org.eclipse.ditto.base.model.entity.id.EntityId;
import org.eclipse.ditto.base.model.headers.WithDittoHeaders;
/**
* An enforcement task to be scheduled.
* TODO CR-11297 candidate for removal
*/
final class EnforcementTask {
private final EntityId entityId;
private final boolean changesAuthorization;
private final Supplier<CompletionStage<Contextual<?>>> taskSupplier;
private EnforcementTask(final EntityId entityId,
final boolean changesAuthorization, final Supplier<CompletionStage<Contextual<?>>> taskSupplier) {
this.entityId = entityId;
this.taskSupplier = taskSupplier;
this.changesAuthorization = changesAuthorization;
}
/**
* Create an enforcement task to be executed later.
*
* @param entityId entity ID for sequentialization.
* @param changesAuthorization whether dispatching the signal would change authorization for subsequent signals.
* @param taskSupplier supplier that when called, starts the enforcement task and returns the result as a future.
* @param <T> type of enforced signals.
* @return the task.
*/
@SuppressWarnings("unchecked") // due to parameterized cast
static <T extends WithDittoHeaders> EnforcementTask of(final EntityId entityId,
final boolean changesAuthorization,
final Supplier<CompletionStage<Contextual<T>>> taskSupplier) {
// The cast is safe: Supplier and CompletionStage are both covariant in its type parameter.
final Supplier<CompletionStage<Contextual<?>>> theTaskSupplier =
(Supplier<CompletionStage<Contextual<?>>>) (Object) taskSupplier;
return new EnforcementTask(entityId, changesAuthorization, theTaskSupplier);
}
EntityId getEntityId() {
return entityId;
}
boolean changesAuthorization() {
return changesAuthorization;
}
CompletionStage<Contextual<?>> start() {
return taskSupplier.get();
}
@Override
public String toString() {
return getClass().getSimpleName() +
"[entityId=" + entityId +
",changesAuthorization=" + changesAuthorization +
"]";
}
}