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ConnectionDeletedStrategies.java
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ConnectionDeletedStrategies.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.connectivity.service.messaging.persistence.strategies.commands;
import javax.annotation.Nullable;
import org.eclipse.ditto.base.model.signals.commands.Command;
import org.eclipse.ditto.connectivity.model.Connection;
import org.eclipse.ditto.connectivity.model.signals.commands.exceptions.ConnectionNotAccessibleException;
import org.eclipse.ditto.connectivity.model.signals.events.ConnectivityEvent;
import org.eclipse.ditto.connectivity.service.messaging.persistence.stages.ConnectionState;
import org.eclipse.ditto.internal.utils.persistentactors.commands.AbstractCommandStrategies;
import org.eclipse.ditto.internal.utils.persistentactors.results.Result;
import org.eclipse.ditto.internal.utils.persistentactors.results.ResultFactory;
/**
* Strategies to handle signals as a nonexistent connection.
*/
public final class ConnectionDeletedStrategies
extends AbstractCommandStrategies<Command<?>, Connection, ConnectionState, ConnectivityEvent<?>>
implements ConnectivityCommandStrategies {
private static final ConnectionDeletedStrategies DELETED_STRATEGIES = newDeletedStrategies();
private ConnectionDeletedStrategies() {
super(Command.class);
}
/**
* @return the unique instance of this class.
*/
public static ConnectionDeletedStrategies getInstance() {
return DELETED_STRATEGIES;
}
private static ConnectionDeletedStrategies newDeletedStrategies() {
final ConnectionDeletedStrategies strategies = new ConnectionDeletedStrategies();
strategies.addStrategy(new StagedCommandStrategy());
strategies.addStrategy(new TestConnectionStrategy());
strategies.addStrategy(new CreateConnectionStrategy());
return strategies;
}
@Override
public Result<ConnectivityEvent<?>> unhandled(final Context<ConnectionState> context,
@Nullable final Connection entity,
final long nextRevision,
final Command<?> command) {
context.getLog().withCorrelationId(command)
.warning("Received command for deleted connection, rejecting: <{}>", command);
return ResultFactory.newErrorResult(ConnectionNotAccessibleException.newBuilder(context.getState().id())
.dittoHeaders(command.getDittoHeaders())
.build(), command);
}
@Override
public boolean isDefined(final Command<?> command) {
// always defined so as to log ignored signals on debug level.
return true;
}
@Override
protected Result<ConnectivityEvent<?>> getEmptyResult() {
return ResultFactory.emptyResult();
}
}