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SEQUENCE SERVER Extracts monotonically increasing sequences of numbers it receives via a HTTP API. Provides a way to read some number of largest sequences, also via HTTP API. PREREQUISITES - yaws - erlang - make - (optional) ruby and "cucumber" gem for running tests BUILDING First, set YAWS_HOME environment variable to yaws installation directory: $ export YAWS_HOME=/opt/local/lib/yaws Then, run make: $ make To ensure that everything works ok, run the tests: $ make test RUNNING $ ./bin/sequence_server [path/to/sequence_server.config] Configuration file allows to specify a port the server listens on and maximum number of sequences to keep. See example in doc/sequence_server.config for details. API Server provides the following HTTP API: 1. register a new number: # Client->Server POST /put HTTP/1.1 Host: localhost Content-Type: text/plain Content-Length: <...> <number> server returns one of the following statuses: - "204 No Content" -- OK - "400 Bad Request" -- Failed to parse requests (for instance, wrong number format) - "5xx" -- Internal server error 2. Get the list of largest sequences # Client -> Server GET /get HTTP/1.1 Host: localhost # Server -> Client HTTP/1.1 200 OK Content-Type: text/json [[1,2,3], [4,5,6]] Server returns JSON-encoded array of arrays, each nested array representing one stored sequence. See features/get.feature and features/put.feature for more examples APPLICATION STRUCTURE Main modules: - sequence_server.erl -- manages current server state -- that is, a set of largest sequences and a current sequence; - sequence.erl -- provides an API to work with individual monotonically increasing sequences - seq_cache.erl -- provides a "cache" of a fixed number of largest sequences met so far - seq_appmod.erl -- provides HTTP API Auxillary modules: - sequence_app.erl -- controls application startup and configuration, - *_sup.erl -- supervisors - seq_yaws.erl -- yaws embedding code - sequence_ctl.erl -- some helpers used by tests to control server state Tests: - src/*_tests.erl -- eUnit tests - features/*.feature -- some acceptance tests. Require cucumber (http://cukes.info/) to run.