org.eclipse.ditto.connectivity.service.messaging.persistence.strategies.commands.TestConnectionStrategy Maven / Gradle / Ivy

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Eclipse Ditto is a framework for creating and managing digital twins in the IoT.

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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.connectivity.service.messaging.persistence.strategies.commands;

import static org.eclipse.ditto.internal.utils.persistentactors.results.ResultFactory.newErrorResult;
import static org.eclipse.ditto.internal.utils.persistentactors.results.ResultFactory.newMutationResult;
import static org.eclipse.ditto.internal.utils.persistentactors.results.ResultFactory.newQueryResult;

import java.util.Arrays;
import java.util.List;
import java.util.Optional;

import javax.annotation.Nullable;

import org.eclipse.ditto.base.model.entity.metadata.Metadata;
import org.eclipse.ditto.base.model.exceptions.DittoRuntimeException;
import org.eclipse.ditto.connectivity.model.Connection;
import org.eclipse.ditto.connectivity.service.messaging.persistence.stages.ConnectionAction;
import org.eclipse.ditto.connectivity.service.messaging.persistence.stages.ConnectionState;
import org.eclipse.ditto.connectivity.service.messaging.persistence.stages.StagedCommand;
import org.eclipse.ditto.internal.utils.persistentactors.results.Result;
import org.eclipse.ditto.connectivity.model.signals.commands.modify.TestConnection;
import org.eclipse.ditto.connectivity.model.signals.commands.modify.TestConnectionResponse;
import org.eclipse.ditto.connectivity.model.signals.events.ConnectionCreated;
import org.eclipse.ditto.connectivity.model.signals.events.ConnectivityEvent;

/**
 * This strategy handles the {@link org.eclipse.ditto.connectivity.model.signals.commands.modify.TestConnection} command.
 */
final class TestConnectionStrategy extends AbstractConnectivityCommandStrategy {

    TestConnectionStrategy() {
        super(TestConnection.class);
    }

    @Override
    protected Result> doApply(final Context context,
            @Nullable final Connection entity,
            final long nextRevision,
            final TestConnection command,
            @Nullable final Metadata metadata) {

        final Optional validationError = validate(context, command);
        if (validationError.isPresent()) {
            return newErrorResult(validationError.get(), command);
        } else if (entity == null) {
            final Connection connection = command.getConnection();
            final ConnectivityEvent event = ConnectionCreated.of(connection, nextRevision,
                    getEventTimestamp(), command.getDittoHeaders(), metadata);
            final List actions =
                    Arrays.asList(
                            ConnectionAction.APPLY_EVENT, ConnectionAction.TEST_CONNECTION, ConnectionAction.SEND_RESPONSE, ConnectionAction.PASSIVATE);
            final StagedCommand stagedCommand = StagedCommand.of(command, event, command, actions);
            return newMutationResult(stagedCommand, event, command);
        } else {
            return newQueryResult(command,
                    TestConnectionResponse.alreadyCreated(context.getState().id(), command.getDittoHeaders()));
        }
    }
}