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Official LaunchDarkly SDK for Java
package com.launchdarkly.client;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import redis.clients.jedis.JedisPoolConfig;
import redis.clients.jedis.Protocol;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.concurrent.TimeUnit;
/**
* This class exposes advanced configuration options for the {@link com.launchdarkly.client.RedisFeatureStore}.
*
* A builder that helps construct {@link com.launchdarkly.client.RedisFeatureStore} objects.
* {@link RedisFeatureStoreBuilder} calls can be chained, enabling the following pattern:
*
*
* RedisFeatureStore store = new RedisFeatureStoreBuilder("host", 443, 60)
* .refreshStaleValues(true)
* .asyncRefresh(true)
* .socketTimeout(200)
* .build()
*
*/
public class RedisFeatureStoreBuilder {
private static final Logger logger = LoggerFactory.getLogger(RedisFeatureStoreBuilder.class);
protected boolean refreshStaleValues = false;
protected boolean asyncRefresh = false;
protected URI uri;
protected String prefix;
protected int connectTimeout = Protocol.DEFAULT_TIMEOUT;
protected int socketTimeout = Protocol.DEFAULT_TIMEOUT;
protected long cacheTimeSecs;
protected JedisPoolConfig poolConfig;
/**
* The constructor accepts the mandatory fields that must be specified at a minimum to construct a {@link com.launchdarkly.client.RedisFeatureStore}.
*
* @param uri the uri of the Redis resource to connect to.
* @param cacheTimeSecs the cache time in seconds. See {@link RedisFeatureStoreBuilder#cacheTime(long, TimeUnit)} for more information.
*/
public RedisFeatureStoreBuilder(URI uri, long cacheTimeSecs) {
this.uri = uri;
this.cacheTimeSecs = cacheTimeSecs;
}
/**
* The constructor accepts the mandatory fields that must be specified at a minimum to construct a {@link com.launchdarkly.client.RedisFeatureStore}.
*
* @param scheme the URI scheme to use
* @param host the hostname to connect to
* @param port the port to connect to
* @param cacheTimeSecs the cache time in seconds. See {@link RedisFeatureStoreBuilder#cacheTime(long, TimeUnit)} for more information.
* @throws URISyntaxException if the URI is not valid
*/
public RedisFeatureStoreBuilder(String scheme, String host, int port, long cacheTimeSecs) throws URISyntaxException {
this.uri = new URI(scheme, null, host, port, null, null, null);
this.cacheTimeSecs = cacheTimeSecs;
}
/**
* Optionally set the {@link RedisFeatureStore} local cache to refresh stale values instead of evicting them (the default behaviour).
*
* When enabled; the cache refreshes stale values instead of completely evicting them. This mode returns the previously cached, stale values if
* anything goes wrong during the refresh phase (for example a connection timeout). If there was no previously cached value then the store will
* return null (resulting in the default value being returned). This is useful if you prefer the most recently cached feature rule set to be returned
* for evaluation over the default value when updates go wrong.
*
* When disabled; results in a behaviour which evicts stale values from the local cache and retrieves the latest value from Redis. If the updated value
* can not be returned for whatever reason then a null is returned (resulting in the default value being returned).
*
* This property has no effect if the cache time is set to 0. See {@link RedisFeatureStoreBuilder#cacheTime(long, TimeUnit)} for details.
*
* See: CacheBuilder for more specific information on cache semantics.
*
* @param enabled turns on lazy refresh of cached values.
* @return the builder
*/
public RedisFeatureStoreBuilder refreshStaleValues(boolean enabled) {
this.refreshStaleValues = enabled;
return this;
}
/**
* Optionally make cache refresh mode asynchronous. This setting only works if {@link RedisFeatureStoreBuilder#refreshStaleValues(boolean)} has been enabled
* and has no effect otherwise.
*
* Upon hitting a stale value in the local cache; the refresh of the value will be asynchronous which will return the previously cached value in a
* non-blocking fashion to threads requesting the stale key. This internally will utilize a {@link java.util.concurrent.Executor} to asynchronously
* refresh the stale value upon the first read request for the stale value in the cache.
*
* If there was no previously cached value then the feature store returns null (resulting in the default value being returned). Any exception
* encountered during the asynchronous reload will simply keep the previously cached value instead.
*
* This setting is ideal to enable when you desire high performance reads and can accept returning stale values for the period of the async refresh. For
* example configuring this feature store with a very low cache time and enabling this feature would see great performance benefit by decoupling calls
* from network I/O.
*
* This property has no effect if the cache time is set to 0. See {@link RedisFeatureStoreBuilder#cacheTime(long, TimeUnit)} for details.
*
* @param enabled turns on asychronous refreshes on.
* @return the builder
*/
public RedisFeatureStoreBuilder asyncRefresh(boolean enabled) {
this.asyncRefresh = enabled;
return this;
}
/**
* Optionally configures the namespace prefix for all keys stored in Redis.
*
* @param prefix the namespace prefix
* @return the builder
*/
public RedisFeatureStoreBuilder prefix(String prefix) {
this.prefix = prefix;
return this;
}
/**
* A mandatory field which configures the amount of time the store should internally cache the value before being marked invalid.
*
* The eviction strategy of stale values is determined by the configuration picked. See {@link RedisFeatureStoreBuilder#refreshStaleValues(boolean)} for
* more information on stale value updating strategies.
*
* If this value is set to 0 then it effectively disables local caching altogether.
*
* @param cacheTime the time value to cache for
* @param timeUnit the time unit for the time value. This is used to convert your time value to seconds.
* @return the builder
*/
public RedisFeatureStoreBuilder cacheTime(long cacheTime, TimeUnit timeUnit) {
this.cacheTimeSecs = timeUnit.toSeconds(cacheTime);
return this;
}
/**
* Optional override if you wish to specify your own configuration to the underlying Jedis pool.
*
* @param poolConfig the Jedis pool configuration.
* @return the builder
*/
public RedisFeatureStoreBuilder poolConfig(JedisPoolConfig poolConfig) {
this.poolConfig = poolConfig;
return this;
}
/**
* Optional override which sets the connection timeout for the underlying Jedis pool which otherwise defaults to
* {@link redis.clients.jedis.Protocol#DEFAULT_TIMEOUT}
*
* @param connectTimeout the timeout
* @param timeUnit the time unit for the timeout
* @return the builder
*/
public RedisFeatureStoreBuilder connectTimeout(int connectTimeout, TimeUnit timeUnit) {
this.connectTimeout = (int) timeUnit.toMillis(connectTimeout);
return this;
}
/**
* Optional override which sets the connection timeout for the underlying Jedis pool which otherwise defaults to
* {@link redis.clients.jedis.Protocol#DEFAULT_TIMEOUT}
*
* @param socketTimeout the socket timeout
* @param timeUnit the time unit for the timeout
* @return the builder
*/
public RedisFeatureStoreBuilder socketTimeout(int socketTimeout, TimeUnit timeUnit) {
this.socketTimeout = (int) timeUnit.toMillis(socketTimeout);
return this;
}
/**
* Build a {@link RedisFeatureStore} based on the currently configured builder object.
*
* @return the {@link RedisFeatureStore} configured by this builder.
*/
public RedisFeatureStore build() {
logger.info("Creating RedisFeatureStore with uri: " + uri + " and prefix: " + prefix);
return new RedisFeatureStore(this);
}
}
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