107 lines
2.6 KiB
Java
107 lines
2.6 KiB
Java
package mineplex.reportserver;
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import java.util.logging.Level;
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import java.util.logging.Logger;
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import org.apache.commons.lang3.Validate;
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import org.apache.commons.lang3.time.DurationFormatUtils;
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import redis.clients.jedis.Jedis;
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import redis.clients.jedis.JedisPool;
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/**
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* Establishes and maintains a connection to Redis.
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*/
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public class RedisConnectionHandler implements Runnable
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{
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private final String _name;
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private final JedisPool _jedisPool;
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private final RedisCommandHandler _handler;
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private final String[] _channels;
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private final Logger _logger;
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private long _lastConnectionMillis = -1;
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private Throwable _lastThrowable = null;
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public RedisConnectionHandler(String name, JedisPool jedisPool, RedisCommandHandler handler, String[] channels, Logger logger)
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{
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_name = name;
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_jedisPool = jedisPool;
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_handler = handler;
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_channels = channels;
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_logger = logger;
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Validate.isTrue(channels.length > 0, "Must provide at least one channel.");
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}
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@Override
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public void run()
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{
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while (!Thread.interrupted())
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{
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try
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{
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registerChannelHandlers();
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}
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catch (Throwable e)
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{
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// Only log new errors (prevents same error being spammed)
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if (_lastThrowable == null || !e.getClass().equals(_lastThrowable.getClass()))
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{
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if (_lastThrowable == null) // connection just failed
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{
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_lastConnectionMillis = System.currentTimeMillis();
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}
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_logger.log(Level.SEVERE, prefixMessage(
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"Exception in Redis connection"
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+ (_lastConnectionMillis != -1 ? " (no connection for " + getLastConnectionDuration() + ")" : "")
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+ ", attempting to regain connection."
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), e);
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_lastThrowable = e;
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}
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try
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{
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Thread.sleep(1000 * 5);
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}
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catch (InterruptedException ignored) {}
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}
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}
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_jedisPool.destroy();
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_logger.warning("Thread interrupted, end of connection.");
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}
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private void registerChannelHandlers()
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{
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try (Jedis jedis = _jedisPool.getResource())
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{
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connectionEstablished();
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jedis.subscribe(_handler, _channels);
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}
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}
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private void connectionEstablished()
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{
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// subscribe blocks so we need to do all this before
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_logger.info(
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_lastThrowable == null
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? prefixMessage("Connected.")
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: prefixMessage(String.format("Connected after %s.", getLastConnectionDuration()))
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);
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_lastThrowable = null;
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}
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private String prefixMessage(String message)
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{
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return String.format("[%s] %s", _name, message);
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}
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private String getLastConnectionDuration()
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{
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return DurationFormatUtils.formatDurationWords(System.currentTimeMillis() - _lastConnectionMillis, true, true);
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}
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}
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