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ConnectionConflictStrategy.java
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ConnectionConflictStrategy.java
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/*
* Copyright (c) 2019 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.services.connectivity.messaging.persistence.strategies.commands;
import static org.eclipse.ditto.services.utils.persistentactors.results.ResultFactory.newErrorResult;
import javax.annotation.Nullable;
import org.eclipse.ditto.model.base.entity.metadata.Metadata;
import org.eclipse.ditto.model.connectivity.Connection;
import org.eclipse.ditto.services.connectivity.messaging.persistence.stages.ConnectionState;
import org.eclipse.ditto.services.utils.persistentactors.results.Result;
import org.eclipse.ditto.signals.commands.connectivity.exceptions.ConnectionConflictException;
import org.eclipse.ditto.signals.commands.connectivity.modify.CreateConnection;
import org.eclipse.ditto.signals.events.connectivity.ConnectivityEvent;
/**
* This strategy handles the {@link org.eclipse.ditto.signals.commands.connectivity.modify.CreateConnection} command
* when a conflict was encountered.
*/
final class ConnectionConflictStrategy extends AbstractConnectivityCommandStrategy<CreateConnection> {
ConnectionConflictStrategy() {
super(CreateConnection.class);
}
@Override
protected Result<ConnectivityEvent<?>> doApply(final Context<ConnectionState> context,
@Nullable final Connection entity,
final long nextRevision,
final CreateConnection command,
@Nullable final Metadata metadata) {
context.getLog().withCorrelationId(command)
.info("Connection <{}> already exists! Responding with conflict.", context.getState().id());
final ConnectionConflictException conflictException =
ConnectionConflictException.newBuilder(context.getState().id())
.dittoHeaders(command.getDittoHeaders())
.build();
return newErrorResult(conflictException, command);
}
}