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MqttConfig.java
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MqttConfig.java
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/*
* Copyright (c) 2020 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.config;
import java.time.Duration;
import javax.annotation.concurrent.Immutable;
import org.eclipse.ditto.services.utils.config.KnownConfigValue;
/**
* Provides configuration settings of the MQTT protocol.
*/
@Immutable
public interface MqttConfig {
/**
* Returns the maximum number of buffered messages for each MQTT source.
*
* @return the buffer size.
*/
int getSourceBufferSize();
/**
* Indicates whether the client should reconnect to enforce a redelivery for a failed acknowledgement.
*
* @return true if the client should reconnect, false if not.
*/
boolean shouldReconnectForRedelivery();
/**
* @return the amount of time that a reconnect will be delayed after a failed acknowledgement.
*/
Duration getReconnectForRedeliveryDelay();
/**
* Indicates whether a separate client should be used for publishing. This could be useful when
* {@link #shouldReconnectForRedelivery()} returns true to avoid that the publisher has downtimes.
*
* @return true if a separate client should be used, false if not.
*/
boolean shouldUseSeparatePublisherClient();
/**
* An enumeration of the known config path expressions and their associated default values for
* {@code MqttConfig}.
*/
enum MqttConfigValue implements KnownConfigValue {
/**
* The maximum number of buffered messages for each MQTT source.
*/
SOURCE_BUFFER_SIZE("source-buffer-size", 8),
/**
* Indicates whether the client should reconnect to enforce a redelivery for a failed acknowledgement.
*/
RECONNECT_FOR_REDELIVERY("reconnect-for-redelivery", false),
/**
* The amount of time that a reconnect will be delayed after a failed acknowledgement
*/
RECONNECT_FOR_REDELIVERY_DELAY("reconnect-for-redelivery-delay", Duration.ofSeconds(2)),
/**
* Indicates whether a separate client should be used for publishing. This could be useful when
* {@link #shouldReconnectForRedelivery()} returns true to avoid that the publisher has downtimes.
*/
SEPARATE_PUBLISHER_CLIENT("separate-publisher-client", false);
private final String path;
private final Object defaultValue;
MqttConfigValue(final String thePath, final Object theDefaultValue) {
path = thePath;
defaultValue = theDefaultValue;
}
@Override
public Object getDefaultValue() {
return defaultValue;
}
@Override
public String getConfigPath() {
return path;
}
}
}