Code Duplication    Length = 10-11 lines in 4 locations

src/Cache/RedisCache.php 4 locations

@@ 223-232 (lines=10) @@
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     * @override
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     * @inheritDoc
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     */
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    public function getTtl($key)
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    {
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        if (!$this->isStarted())
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        {
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            return Promise::doReject(new ReadException('Cache object is not open.'));
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        }
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        return $this->redis->ttl($key)->then(function($result) {
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            return $result > 0 ? $result : 0;
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        });
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    }
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    /**
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     * @override
@@ 238-247 (lines=10) @@
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     * @override
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     * @inheritDoc
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     */
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    public function removeTtl($key)
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    {
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        if (!$this->isStarted())
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        {
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            return Promise::doReject(new WriteException('Cache object is not open.'));
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        }
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        return $this->redis->persist($key)->then(function($result) {
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            return $result > 0;
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        });
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    }
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    /**
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     * @override
@@ 253-262 (lines=10) @@
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     * @override
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     * @inheritDoc
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     */
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    public function existsTtl($key)
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    {
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        if (!$this->isStarted())
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        {
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            return Promise::doReject(new ReadException('Cache object is not open.'));
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        }
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        return $this->redis->ttl($key)->then(function($result) {
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            return $result >= 0;
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        });
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    }
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    /**
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     * @override
@@ 268-278 (lines=11) @@
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     * @override
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     * @inheritDoc
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     */
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    public function getKeys()
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    {
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        if (!$this->isStarted())
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        {
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            return Promise::doReject(new ReadException('Cache object is not open.'));
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        }
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        return $this->redis->keys()->then(function($result) {
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            sort($result);
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            return $result;
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        });
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    }
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    /**
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     * @override