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I'm using RedisTemplate(from Spring) in my Java app. I need to do pop from a list of elements correspondenting for values, but without removing it. Any suggestions?
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To retrieve all the items of a list with Redis, you do not need to iterate and fetch each individual items. It would be really inefficient. You just have to use the LRANGE command to retrieve all the items in one shot. will return all the items of the list without altering the list itself.
To get elements in a Redis, use the LRANGE command. This command takes the name of the list and the index range of the element you wish to access. The command should return the values of the elements in the specified range.
Delete the key, and that will clear all items. Not having the list at all is similar to not having any items in it. Redis will not throw any exceptions when you try to access a non-existent key.
Redis and PHP Redis LPOP command removes and returns the first element of the list stored at the key.
You can easily peek at an item rather than popping it by using the range command.
With Spring, from a RedisTemplate instance, you can get a ListOperations instance by using the opsForList() method, and then:
listOp.range(key, 0, 0) will return the first (left) item without popping it
listOp.range(key, -1, -1) will return the last (right) item without popping it
See documentation at:
http://static.springsource.org/spring-data/data-keyvalue/docs/1.0.x/api/org/springframework/data/keyvalue/redis/core/RedisTemplate.html
http://static.springsource.org/spring-data/data-keyvalue/docs/1.0.x/api/org/springframework/data/keyvalue/redis/core/ListOperations.html
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