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DefaultContext.java
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DefaultContext.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.internal.utils.persistentactors.commands;
import static org.eclipse.ditto.base.model.common.ConditionChecker.checkNotNull;
import java.util.Objects;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.internal.utils.pekko.logging.DittoDiagnosticLoggingAdapter;
import org.apache.pekko.actor.ActorSystem;
/**
* Holds the context required to execute the
* {@link CommandStrategy}s.
*
* @param <K> the type of the context's state
*/
@Immutable
public final class DefaultContext<K> implements CommandStrategy.Context<K> {
private final K state;
private final DittoDiagnosticLoggingAdapter log;
private final ActorSystem actorSystem;
private DefaultContext(final K state, final DittoDiagnosticLoggingAdapter log, final ActorSystem actorSystem) {
this.state = checkNotNull(state, "state");
this.log = checkNotNull(log, "log");
this.actorSystem = checkNotNull(actorSystem, "actorSystem");
}
/**
* Returns an instance of {@code DefaultContext}.
*
* @param state the state.
* @param log the logging adapter to be used.
* @return the instance.
* @throws NullPointerException if any argument is {@code null}.
*/
public static <K> DefaultContext<K> getInstance(final K state, final DittoDiagnosticLoggingAdapter log,
final ActorSystem actorSystem) {
return new DefaultContext<>(state, log, actorSystem);
}
@Override
public K getState() {
return state;
}
@Override
public DittoDiagnosticLoggingAdapter getLog() {
return log;
}
@Override
public ActorSystem getActorSystem() {
return actorSystem;
}
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
final DefaultContext<?> that = (DefaultContext<?>) o;
return Objects.equals(state, that.state)
&& Objects.equals(log, that.log)
&& Objects.equals(actorSystem, that.actorSystem);
}
@Override
public int hashCode() {
return Objects.hash(state, log, actorSystem);
}
@Override
public String toString() {
return getClass().getSimpleName() + " [" +
"state=" + state +
", log=" + log +
", actorSystem=" + actorSystem +
"]";
}
}