/
StreamingConfig.java
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/
StreamingConfig.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.gateway.streaming;
import java.time.Duration;
import java.util.HashMap;
import java.util.Map;
import org.eclipse.ditto.services.base.config.SignalEnrichmentConfig;
import org.eclipse.ditto.services.utils.config.KnownConfigValue;
import com.typesafe.config.Config;
import com.typesafe.config.ConfigFactory;
/**
* Provides configuration settings of general gateway streaming functionality.
*/
public interface StreamingConfig {
/**
* Config path relative to its parent.
*/
String CONFIG_PATH = "streaming";
/**
* Returns the session counter update interval.
*
* @return the interval.
*/
Duration getSessionCounterScrapeInterval();
/**
* Returns the websocket config for streaming.
*
* @return the websocket config.
*/
WebsocketConfig getWebsocketConfig();
/**
* Returns the signal-enrichment config.
*
* @return the signal-enrichment config.
*/
SignalEnrichmentConfig getSignalEnrichmentConfig();
/**
* Returns maximum number of stream elements to process in parallel.
*
* @return the parallelism.
*/
int getParallelism();
/**
* Render this object into a Config object from which a copy of this object can be constructed.
*
* @return a config representation.
*/
default Config render() {
final Map<String, Object> map = new HashMap<>();
map.put(StreamingConfigValue.SESSION_COUNTER_SCRAPE_INTERVAL.getConfigPath(),
getSessionCounterScrapeInterval().toMillis() + "ms");
map.put(StreamingConfigValue.PARALLELISM.getConfigPath(), getParallelism());
return ConfigFactory.parseMap(map)
.withFallback(getWebsocketConfig().render())
.withFallback(getSignalEnrichmentConfig().render())
.atKey(CONFIG_PATH);
}
/**
* An enumeration of the known config path expressions and their associated default values for
* {@code StreamingConfig}.
*/
enum StreamingConfigValue implements KnownConfigValue {
/**
* How often to update websocket session counter by counting child actors.
*/
SESSION_COUNTER_SCRAPE_INTERVAL("session-counter-scrape-interval", Duration.ofSeconds(30L)),
/**
* Maximum number of stream elements to process in parallel.
*/
PARALLELISM("parallelism", 1);
private final String path;
private final Object defaultValue;
StreamingConfigValue(final String thePath, final Object theDefaultValue) {
path = thePath;
defaultValue = theDefaultValue;
}
@Override
public Object getDefaultValue() {
return defaultValue;
}
@Override
public String getConfigPath() {
return path;
}
}
}