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OpenConnectionStrategy.java
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OpenConnectionStrategy.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.connectivity.messaging.persistence.stages.ConnectionAction.OPEN_CONNECTION;
import static org.eclipse.ditto.services.connectivity.messaging.persistence.stages.ConnectionAction.PERSIST_AND_APPLY_EVENT;
import static org.eclipse.ditto.services.connectivity.messaging.persistence.stages.ConnectionAction.SEND_RESPONSE;
import static org.eclipse.ditto.services.connectivity.messaging.persistence.stages.ConnectionAction.UPDATE_SUBSCRIPTIONS;
import static org.eclipse.ditto.services.utils.persistentactors.results.ResultFactory.newErrorResult;
import static org.eclipse.ditto.services.utils.persistentactors.results.ResultFactory.newMutationResult;
import java.util.Arrays;
import java.util.List;
import java.util.Optional;
import javax.annotation.Nullable;
import org.eclipse.ditto.model.base.entity.metadata.Metadata;
import org.eclipse.ditto.model.base.exceptions.DittoRuntimeException;
import org.eclipse.ditto.model.base.headers.WithDittoHeaders;
import org.eclipse.ditto.model.connectivity.Connection;
import org.eclipse.ditto.services.connectivity.messaging.persistence.stages.ConnectionAction;
import org.eclipse.ditto.services.connectivity.messaging.persistence.stages.ConnectionState;
import org.eclipse.ditto.services.connectivity.messaging.persistence.stages.StagedCommand;
import org.eclipse.ditto.services.utils.persistentactors.results.Result;
import org.eclipse.ditto.signals.commands.connectivity.modify.OpenConnection;
import org.eclipse.ditto.signals.commands.connectivity.modify.OpenConnectionResponse;
import org.eclipse.ditto.signals.events.connectivity.ConnectionOpened;
import org.eclipse.ditto.signals.events.connectivity.ConnectivityEvent;
/**
* This strategy handles the {@link org.eclipse.ditto.signals.commands.connectivity.modify.OpenConnection} command.
*/
final class OpenConnectionStrategy extends AbstractConnectivityCommandStrategy<OpenConnection> {
OpenConnectionStrategy() {
super(OpenConnection.class);
}
@Override
protected Result<ConnectivityEvent<?>> doApply(final Context<ConnectionState> context,
@Nullable final Connection connection,
final long nextRevision,
final OpenConnection command,
@Nullable final Metadata metadata) {
final Optional<DittoRuntimeException> validationError = validate(context, command, connection);
if (validationError.isPresent()) {
return newErrorResult(validationError.get(), command);
} else {
final ConnectivityEvent event = ConnectionOpened.of(context.getState().id(), command.getDittoHeaders());
final WithDittoHeaders response =
OpenConnectionResponse.of(context.getState().id(), command.getDittoHeaders());
final List<ConnectionAction> actions =
Arrays.asList(PERSIST_AND_APPLY_EVENT, OPEN_CONNECTION, UPDATE_SUBSCRIPTIONS, SEND_RESPONSE);
return newMutationResult(StagedCommand.of(command, event, response, actions), event, response);
}
}
}