Following is the basic syntax of Redis EVALSHA command. script_sha string. Redis: Storing time-series data in a sorted set – Bits & Bytes 11.1.2 Creating a new status message As we build Lua scripts to perform a set of operations, it’s good to start with a short example that isn’t terribly complicated or structure-intensive. I have a medium complexity LUA script which i have tested via the redis-cli. Scripts can access the specified Redis keys named as arguments to the command and and additional string parameters that the user wants to pass to the script. Redis, the popular open source in-memory data store, has been used as a persistent on-disk database that supports a variety of data structures such as lists, sets, sorted sets (with range queries), strings, geospatial indexes (with radius queries), bitmaps, hashes, and HyperLogLogs. For example, the command: We saw this first when we were scheduling the caching of rows in Redis back in section 2.4. Available since 7.0.0. Our first implementation records the id’s of all the lots in the account using a SET, identified by account id, and then uses one Redis HASH per LOT, identified by LOT ID, with the ticker, quantity, and purchase price as the fields. Suggestions on using Redis commands: Pay attention to the value of N for commands whose time complexity is O (N). Support for clustering using client-side sharding and pluggable keyspace distributors. eval. The first argument of EVAL is a Lua 5.1 script. Getting Redis For An Application. EVAL and EVALSHA are used to evaluate scripts using the Lua interpreter built into Redis starting from version 2.6.0.. a Redis URL, for a TCP connection: redis://: [password]@ [hostname]: [port]/ [db] (password, port and database are optional), for a unix socket connection: unix:// [path to Redis … the connection might be opened successfully in the first place, but when some code tries to read/write to Redis… I mean: BookSleeve's author @MarcGravell recommends not to open & close the connection every time, but rather maintain one connection throughout the app. It is just a Lua program that will run in the context of the Redis … Running a Lua script is fairly simple: you can use the EVAL command which takes the script as one of its arguments. Example: you can also pass an optional Redis Pool import redis from redis_rate_limit import RateLimit , TooManyRequests redis_pool = redis . Because this is related to your session one relevant thing that you could do is put less things there, especially the big items and start caching them separately. I understand that the common way of running Lua scripts with EVALSHA is to is to load the script first by passing it with SCRIPT LOAD.However, from my understanding, if the Redis server unexpectedly reboots, for example, the cached script will no longer exist and will have to be reloaded with SCRIPT LOAD.. Is there some way to set the Redis server to automatically load some specified … But how can you handle network breaks? Example: 127.0.0.1:6379> EVAL "return redis.call('incr','foo')" 0 (integer) 1 127.0.0.1:6379> EVALSHA 22c9dbdd80709fb523d10691f558682a9d7129bf (error) ERR wrong number of arguments for 'evalsha' command 127.0.0.1:6379> EVALSHA 22c9dbdd80709fb523d10691f558682a9d7129bf 0 (integer) 2 127.0.0.1:6379> EVALSHA 22c9dbdd80709fb523d10691f558682a9d7129bf 0 (integer) 3 (check on the slave) $ redis … The ”redis.call (‘set’, KEYS [1], ARGV [1])” string is our script which is functionally identical to the Redis’s set command. Three parameters follow the script text: Script arguments fall into two groups: KEYS and ARGV. We specify how many keys the script requires with the number immediately following it. In our example, it is 1. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. The following examples show how to use redis.clients.jedis.Jedis. You don't need to pass the number of arguments. For example the "INFO replication" section # offers this information, which is used, among other tools, by # Redis Sentinel in order to discover replica instances. Does anyone have a solid pattern fetching Redis via BookSleeve library?. 1 Answer1. Unlike EVAL, scripts executed with this command can always be killed and never affect the replication stream.Because it can only read data, this command can always be executed on a master or a replica. Redis EVALSHA command evaluates a script cached on the server side by its SHA1 digest. Eval operations (EVAL, EVALSHA) SCRIPT operations (DEBUG, EXISTS, FLUSH, KILL, LOAD) The EVAL command evaluates a script provided as a string argument to the server. /member.lua nums, 12 Once in debug mode, step through n or s until the … These are the top rated real world C++ (Cpp) examples of RedisCommand extracted from open source projects. Additional functions can be written via Lua scripts for cases where there isn't a "vanilla" function that fits. Applications may sometimes send Eval or evalsha commands in the pipeline. Same result format as COMMAND except you can specify which commands get returned. In this case, we’ll start by writing a Lua script combined with some wrapper code to … Redis EVALSHA command evaluates a script cached on the server side by its SHA1 digest. Scripts are cached on the server side using the SCRIPT LOAD command. The command is otherwise identical to EVAL. Following is the basic syntax of Redis EVALSHA command. You can rate examples to help us improve the quality of examples. No! Redis allows you to preload a script into memory with the SCRIPT LOAD command: You should see an output like this: This is the unique hash of the script which you need to provide to the EVALSHA command to run the script: Note: you should use actual SHA1 hash returned by the SCRIPT LOAD command, the hash above is only an example. Using: EVALSHA sha1 numkeys key1..keyn arg1..arg2. Evaluates a script cached on the server side by its SHA1 digest. redis-commands. These examples are extracted from open source projects. Redis on Fly What Is Redis On Fly. Time complexity: Depends on the script that is executed. Returns Array reply of details about multiple Redis commands. Note − A string value can be at max 512 megabytes in length. * * When a reply if for example a String the handler will be called with a JsonArray with a single element containing * the String. In order to run this command Redis will have to have already loaded the script, either by running it or via the SCRIPT LOAD command. Redis is a popular in-memory key/value store. Following example explains how Redis scripting works. The command is otherwise identical to EVAL. redis 127.0.0.1:6379> EVAL "return {KEYS [1],KEYS [2],ARGV [1],ARGV [2]}" 2 key1 key2 first … Scripts are cached on the server side using the SCRIPT LOAD command. For example, the HGETALL, LRANGE, SMEMBERS, ZRANGE, and SINTER commands may compromise performance if they involve a large number of elements. C++ (Cpp) RedisCommand - 7 examples found. My script takes 2 arguments, no keys. Redis requires data that’s not available at the time of the initial call. Redis provides a lot of functionality for data types "out of the box." If you want to have a named hash, you can use Redis-hashes. * @param sha1 SHA1 digest of the script cached on the server * @param keys List of keys * @param values List of values * @param handler Handler for the result of this call. Note that with the --eval option of redis-cli you can pass key names and arguments to the script, separated by a comma, like in the following example:./redis-cli --ldb - … redis 127.0.0.1:6379> EVALSHA sha1 numkeys key [key ...] arg [arg ...] Example redis 127.0.0.1:6379> EVALSHA "return {KEYS[1],KEYS[2],ARGV[1],ARGV[2]}" 2 key1 key2 first second 1) "key1" 2) "key2" 3) "first" 4) "second" Evaluate a LUA script serverside, from the SHA1 hash of the script instead of the script itself. Remember that you can serialize any object and persist it as a string, so … You will find an example in the tests of this module t/01-basic.t. Using the example in the first section (3), add --ldb to the command to enter debug mode: redis-cli --ldb --eval. Many redis libraries rely on the meta data that a command is readonly to execute on a replica, having this type of read only support enables us to do that. While Redis is single threaded for the most part, it uses an event loop, so it’s doing only one … Time complexity: O (N) when N is number of commands to look up. @Test public void testEvalshaKeyAndArgWithBinary() { byte[] bKey = SafeEncoder.encode("test"); byte[] bArg = SafeEncoder.encode("3"); String script = "redis.call('INCRBY', KEYS[1], ARGV[1]) redis.call('INCRBY', KEYS[1], ARGV[1])"; byte[] bScript = SafeEncoder.encode(script); byte[] bSha1 = jedis.scriptLoad(bScript); assertTrue(jedis.scriptExists(bSha1) == 1); Pipeline p = jedis.pipelined(); … This is a read-only variant of the EVAL command that isn't allowed to execute commands that modify data.. i.e. I'm loading the script on the .NET side from a text file into string luaString, then using. Hashes For example, the command lrnge needs to return multiple values (each element in the list is a value, while lrange needs to return more than one single element). There is no configuration to be done to enable Redis. An example is … The following is the default redis.conf file from an on-demand ... timeout 3600s tcp-keepalive 60 maxclients 10000 rename-command EVAL "EVAL" rename-command EVALSHA "EVALSHA" # Command Masking rename-command CONFIG "A-B-Ab1AZec_-AaC1A2bAbB22a_a1Baa" rename-command SAVE "SAVE" rename-command BGSAVE "BGSAVE" … An example use of LoadedLuaScript: const string Script = "redis.call('set', @key, @value)"; using (ConnectionMultiplexer conn = /* init code */) { var db = conn.GetDatabase(0); var server = conn.GetServer(/* appropriate parameters*/); var prepared = LuaScript.Prepare(Script); var loaded = prepared.Load(server); loaded.Evaluate(db, new { key = (RedisKey)"mykey", value = 123 }); } Scripts can access the specified Redis keys named as arguments to the command and and additional string parameters that the user wants to pass to the script. A simple example follows: redis.replicate_commands() -- Enable effects replication. The sha1 encoded hash of the script you want to run. In the middle of the transaction, we’re using EVALSHA to invoke the script. Redis is logging these because they take more time than the slowlog-log-slower-than configuration parameter. Introduction to EVAL. Redis Lists are simply lists of strings, sorted by insertion order and make it an ideal tool to implement, for instance, message queues: jedis.lpush("queue#tasks", "firstTask"); jedis.lpush("queue#tasks", "secondTask"); String task = jedis.rpop("queue#tasks"); The variable task will hold the value firstTask. LuaScript lua = LuaScript.Prepare (luaString) to create the LuaScript object. catalog [redis calls Lua Script] (ා redis calls Lua script) [redis + Lua realizes the real-time update of the rating list] (ා redis + Lua realizes the real-time update of the rating list) [Lua Script] (ා Lua script)Example of golang calling redis + LuaOptimization of conversion between byte slice and string Redis calls Lua script […] You may check out the related API usage on the sidebar. Scripts are cached on the server side using the SCRIPT LOAD command. Available since 2.8.13. # A Redis master is able to list the address and port of the attached # replicas in different ways. Sneaky concurrency. The second argument to evalsha is an array of script arguments. Redis scripting is used to evaluate scripts using the Lua interpreter. It is built into Redis starting from version 2.6.0. The command used for scripting is EVAL command. Following is the basic syntax of EVAL command. Parameters. Example. The script does not need to define a Lua function (and should not). If you request details about non-existing commands, their return position will be nil. Options Hash ( options ): :url (String) — default: value of the environment variable REDIS_URL —. In this example, we are using the prices with precision of two decimal places. Which means that we got values … The ruby redis gem attempts to clean up some things for you. One example would be fetching some HASH values from Redis, and then using those values to access information from a relational database, which then results in a write back to Redis. Using Redis as Buffer in the ELK stack. Alternatively, you can use SCAN sister commands, such as HSCAN, SSCAN, and ZSCAN commands. Let’s run the following script: eval “local order = redis.call (‘zrange’, KEYS [1], 0, -1); return redis.call (‘hmget’,KEYS [2],unpack (order));” 2 order hkeys. Now, we all know that many, many clients can connect to a single Redis server. Example redis 127.0.0.1:6379> SET name "tutorialspoint" OK redis 127.0.0.1:6379> GET name "tutorialspoint" In the above example, SET and GET are Redis commands, name is the key used in Redis and tutorialspoint is the string value that is stored in Redis. For example, the command: EVAL "return {KEYS,KEYS,ARGV,ARGV }" 2 key1 key2 first second evalSha Description. redis.call('set','A','1') redis.set_repl(redis.REPL_NONE) redis.call('set','B','2') redis.set_repl(redis.REPL_ALL) redis.call('set','C','3') After running the above script, the result is that only keys A and C will be created on replicas and AOF. On Fly, it can provide a region-local cache to Fly applications and a cross-region mechanism for communication. Data Model A. You should see the following output: “value:3” “value:1” “value:2”. Note that this commands sends the Lua script every time you call it. Hashes in Redis cannot be nested as in perl, if you want to store a nested hash, you need to serialize the hash first. Redis also uses the Lua interpreter to execute it's native … Once you have run a script, Redis will save it in the [script cache] and from then on you can use the
redis evalsha example
Following is the basic syntax of Redis EVALSHA command. script_sha string. Redis: Storing time-series data in a sorted set – Bits & Bytes 11.1.2 Creating a new status message As we build Lua scripts to perform a set of operations, it’s good to start with a short example that isn’t terribly complicated or structure-intensive. I have a medium complexity LUA script which i have tested via the redis-cli. Scripts can access the specified Redis keys named as arguments to the command and and additional string parameters that the user wants to pass to the script. Redis, the popular open source in-memory data store, has been used as a persistent on-disk database that supports a variety of data structures such as lists, sets, sorted sets (with range queries), strings, geospatial indexes (with radius queries), bitmaps, hashes, and HyperLogLogs. For example, the command: We saw this first when we were scheduling the caching of rows in Redis back in section 2.4. Available since 7.0.0. Our first implementation records the id’s of all the lots in the account using a SET, identified by account id, and then uses one Redis HASH per LOT, identified by LOT ID, with the ticker, quantity, and purchase price as the fields. Suggestions on using Redis commands: Pay attention to the value of N for commands whose time complexity is O (N). Support for clustering using client-side sharding and pluggable keyspace distributors. eval. The first argument of EVAL is a Lua 5.1 script. Getting Redis For An Application. EVAL and EVALSHA are used to evaluate scripts using the Lua interpreter built into Redis starting from version 2.6.0.. a Redis URL, for a TCP connection: redis://: [password]@ [hostname]: [port]/ [db] (password, port and database are optional), for a unix socket connection: unix:// [path to Redis … the connection might be opened successfully in the first place, but when some code tries to read/write to Redis… I mean: BookSleeve's author @MarcGravell recommends not to open & close the connection every time, but rather maintain one connection throughout the app. It is just a Lua program that will run in the context of the Redis … Running a Lua script is fairly simple: you can use the EVAL command which takes the script as one of its arguments. Example: you can also pass an optional Redis Pool import redis from redis_rate_limit import RateLimit , TooManyRequests redis_pool = redis . Because this is related to your session one relevant thing that you could do is put less things there, especially the big items and start caching them separately. I understand that the common way of running Lua scripts with EVALSHA is to is to load the script first by passing it with SCRIPT LOAD.However, from my understanding, if the Redis server unexpectedly reboots, for example, the cached script will no longer exist and will have to be reloaded with SCRIPT LOAD.. Is there some way to set the Redis server to automatically load some specified … But how can you handle network breaks? Example: 127.0.0.1:6379> EVAL "return redis.call('incr','foo')" 0 (integer) 1 127.0.0.1:6379> EVALSHA 22c9dbdd80709fb523d10691f558682a9d7129bf (error) ERR wrong number of arguments for 'evalsha' command 127.0.0.1:6379> EVALSHA 22c9dbdd80709fb523d10691f558682a9d7129bf 0 (integer) 2 127.0.0.1:6379> EVALSHA 22c9dbdd80709fb523d10691f558682a9d7129bf 0 (integer) 3 (check on the slave) $ redis … The ”redis.call (‘set’, KEYS [1], ARGV [1])” string is our script which is functionally identical to the Redis’s set command. Three parameters follow the script text: Script arguments fall into two groups: KEYS and ARGV. We specify how many keys the script requires with the number immediately following it. In our example, it is 1. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. The following examples show how to use redis.clients.jedis.Jedis. You don't need to pass the number of arguments. For example the "INFO replication" section # offers this information, which is used, among other tools, by # Redis Sentinel in order to discover replica instances. Does anyone have a solid pattern fetching Redis via BookSleeve library?. 1 Answer1. Unlike EVAL, scripts executed with this command can always be killed and never affect the replication stream.Because it can only read data, this command can always be executed on a master or a replica. Redis EVALSHA command evaluates a script cached on the server side by its SHA1 digest. Eval operations (EVAL, EVALSHA) SCRIPT operations (DEBUG, EXISTS, FLUSH, KILL, LOAD) The EVAL command evaluates a script provided as a string argument to the server. /member.lua nums, 12 Once in debug mode, step through n or s until the … These are the top rated real world C++ (Cpp) examples of RedisCommand extracted from open source projects. Additional functions can be written via Lua scripts for cases where there isn't a "vanilla" function that fits. Applications may sometimes send Eval or evalsha commands in the pipeline. Same result format as COMMAND except you can specify which commands get returned. In this case, we’ll start by writing a Lua script combined with some wrapper code to … Redis EVALSHA command evaluates a script cached on the server side by its SHA1 digest. Scripts are cached on the server side using the SCRIPT LOAD command. The command is otherwise identical to EVAL. Following is the basic syntax of Redis EVALSHA command. You can rate examples to help us improve the quality of examples. No! Redis allows you to preload a script into memory with the SCRIPT LOAD command: You should see an output like this: This is the unique hash of the script which you need to provide to the EVALSHA command to run the script: Note: you should use actual SHA1 hash returned by the SCRIPT LOAD command, the hash above is only an example. Using: EVALSHA sha1 numkeys key1..keyn arg1..arg2. Evaluates a script cached on the server side by its SHA1 digest. redis-commands. These examples are extracted from open source projects. Redis on Fly What Is Redis On Fly. Time complexity: Depends on the script that is executed. Returns Array reply of details about multiple Redis commands. Note − A string value can be at max 512 megabytes in length. * * When a reply if for example a String the handler will be called with a JsonArray with a single element containing * the String. In order to run this command Redis will have to have already loaded the script, either by running it or via the SCRIPT LOAD command. Redis is a popular in-memory key/value store. Following example explains how Redis scripting works. The command is otherwise identical to EVAL. redis 127.0.0.1:6379> EVAL "return {KEYS [1],KEYS [2],ARGV [1],ARGV [2]}" 2 key1 key2 first … Scripts are cached on the server side using the SCRIPT LOAD command. For example, the HGETALL, LRANGE, SMEMBERS, ZRANGE, and SINTER commands may compromise performance if they involve a large number of elements. C++ (Cpp) RedisCommand - 7 examples found. My script takes 2 arguments, no keys. Redis requires data that’s not available at the time of the initial call. Redis provides a lot of functionality for data types "out of the box." If you want to have a named hash, you can use Redis-hashes. * @param sha1 SHA1 digest of the script cached on the server * @param keys List of keys * @param values List of values * @param handler Handler for the result of this call. Note that with the --eval option of redis-cli you can pass key names and arguments to the script, separated by a comma, like in the following example:./redis-cli --ldb - … redis 127.0.0.1:6379> EVALSHA sha1 numkeys key [key ...] arg [arg ...] Example redis 127.0.0.1:6379> EVALSHA "return {KEYS[1],KEYS[2],ARGV[1],ARGV[2]}" 2 key1 key2 first second 1) "key1" 2) "key2" 3) "first" 4) "second" Evaluate a LUA script serverside, from the SHA1 hash of the script instead of the script itself. Remember that you can serialize any object and persist it as a string, so … You will find an example in the tests of this module t/01-basic.t. Using the example in the first section (3), add --ldb to the command to enter debug mode: redis-cli --ldb --eval. Many redis libraries rely on the meta data that a command is readonly to execute on a replica, having this type of read only support enables us to do that. While Redis is single threaded for the most part, it uses an event loop, so it’s doing only one … Time complexity: O (N) when N is number of commands to look up. @Test public void testEvalshaKeyAndArgWithBinary() { byte[] bKey = SafeEncoder.encode("test"); byte[] bArg = SafeEncoder.encode("3"); String script = "redis.call('INCRBY', KEYS[1], ARGV[1]) redis.call('INCRBY', KEYS[1], ARGV[1])"; byte[] bScript = SafeEncoder.encode(script); byte[] bSha1 = jedis.scriptLoad(bScript); assertTrue(jedis.scriptExists(bSha1) == 1); Pipeline p = jedis.pipelined(); … This is a read-only variant of the EVAL command that isn't allowed to execute commands that modify data.. i.e. I'm loading the script on the .NET side from a text file into string luaString, then using. Hashes For example, the command lrnge needs to return multiple values (each element in the list is a value, while lrange needs to return more than one single element). There is no configuration to be done to enable Redis. An example is … The following is the default redis.conf file from an on-demand ... timeout 3600s tcp-keepalive 60 maxclients 10000 rename-command EVAL "EVAL" rename-command EVALSHA "EVALSHA" # Command Masking rename-command CONFIG "A-B-Ab1AZec_-AaC1A2bAbB22a_a1Baa" rename-command SAVE "SAVE" rename-command BGSAVE "BGSAVE" … An example use of LoadedLuaScript: const string Script = "redis.call('set', @key, @value)"; using (ConnectionMultiplexer conn = /* init code */) { var db = conn.GetDatabase(0); var server = conn.GetServer(/* appropriate parameters*/); var prepared = LuaScript.Prepare(Script); var loaded = prepared.Load(server); loaded.Evaluate(db, new { key = (RedisKey)"mykey", value = 123 }); } Scripts can access the specified Redis keys named as arguments to the command and and additional string parameters that the user wants to pass to the script. A simple example follows: redis.replicate_commands() -- Enable effects replication. The sha1 encoded hash of the script you want to run. In the middle of the transaction, we’re using EVALSHA to invoke the script. Redis is logging these because they take more time than the slowlog-log-slower-than configuration parameter. Introduction to EVAL. Redis Lists are simply lists of strings, sorted by insertion order and make it an ideal tool to implement, for instance, message queues: jedis.lpush("queue#tasks", "firstTask"); jedis.lpush("queue#tasks", "secondTask"); String task = jedis.rpop("queue#tasks"); The variable task will hold the value firstTask. LuaScript lua = LuaScript.Prepare (luaString) to create the LuaScript object. catalog [redis calls Lua Script] (ා redis calls Lua script) [redis + Lua realizes the real-time update of the rating list] (ා redis + Lua realizes the real-time update of the rating list) [Lua Script] (ා Lua script)Example of golang calling redis + LuaOptimization of conversion between byte slice and string Redis calls Lua script […] You may check out the related API usage on the sidebar. Scripts are cached on the server side using the SCRIPT LOAD command. Available since 2.8.13. # A Redis master is able to list the address and port of the attached # replicas in different ways. Sneaky concurrency. The second argument to evalsha is an array of script arguments. Redis scripting is used to evaluate scripts using the Lua interpreter. It is built into Redis starting from version 2.6.0. The command used for scripting is EVAL command. Following is the basic syntax of EVAL command. Parameters. Example. The script does not need to define a Lua function (and should not). If you request details about non-existing commands, their return position will be nil. Options Hash ( options ): :url (String) — default: value of the environment variable REDIS_URL —. In this example, we are using the prices with precision of two decimal places. Which means that we got values … The ruby redis gem attempts to clean up some things for you. One example would be fetching some HASH values from Redis, and then using those values to access information from a relational database, which then results in a write back to Redis. Using Redis as Buffer in the ELK stack. Alternatively, you can use SCAN sister commands, such as HSCAN, SSCAN, and ZSCAN commands. Let’s run the following script: eval “local order = redis.call (‘zrange’, KEYS [1], 0, -1); return redis.call (‘hmget’,KEYS [2],unpack (order));” 2 order hkeys. Now, we all know that many, many clients can connect to a single Redis server. Example redis 127.0.0.1:6379> SET name "tutorialspoint" OK redis 127.0.0.1:6379> GET name "tutorialspoint" In the above example, SET and GET are Redis commands, name is the key used in Redis and tutorialspoint is the string value that is stored in Redis. For example, the command: EVAL "return {KEYS,KEYS,ARGV,ARGV }" 2 key1 key2 first second evalSha Description. redis.call('set','A','1') redis.set_repl(redis.REPL_NONE) redis.call('set','B','2') redis.set_repl(redis.REPL_ALL) redis.call('set','C','3') After running the above script, the result is that only keys A and C will be created on replicas and AOF. On Fly, it can provide a region-local cache to Fly applications and a cross-region mechanism for communication. Data Model A. You should see the following output: “value:3” “value:1” “value:2”. Note that this commands sends the Lua script every time you call it. Hashes in Redis cannot be nested as in perl, if you want to store a nested hash, you need to serialize the hash first. Redis also uses the Lua interpreter to execute it's native … Once you have run a script, Redis will save it in the [script cache] and from then on you can use the
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