Passtime-Server

For each client, the server keeps a log of its queries and their results, as well as a general log of all client requests. Logs are stored in the server's internal memory (outside the file system)

The server (server class) provides information about the elapsed time. Clients (Client class):

• connect to the server
• send requests

Protocol

Task	Answer	Example
login id	logged in	login Adam
date from	description of the passage of time according to the specification	2021-02-20 2021-04-30
bye	logged out
bye and log transfer	client log content	in the example printout of the Main class

Construction of the Server class

constructor: : public Server(String host, int port)

method public void stratServer() - runs the server in a separate thread

method public void stopServer() - stops the server and the thread it is running on

method String getServerLog() - returns general server log

• multiplexing of socket channels

• The server can handle multiple clients in parallel, but client requests are handled in a single thread

Construction of the Client class

constructor: : public Client(String host, int port, String id)

method public void connect() - connects to the server

method public String send(String req) - sends a req request and returns the server response

• non-blocking input - output

Console results

the contents of the PassTimeServerOptions.yaml file

host: localhost
port: 7777
concurMode: true
showSendRes: true
clientsMap:
 Asia:
  - 2016-03-30T12:00 2020-03-30T:10:15
  - 2019-01-10 2020-03-01
  - 2020-03-27T10:00 2020-03-28T10:00
  - 2016-03-30T12:00 2020-03-30T10:15
Adam:
 - 2018-01-01 2020-03-27
 - 2019-01-01 2020-02-28
 - 2019-01-01 2019-02-29
  - 2020-03-28T10:00 2020-03-29T10:00

result

localhost 7777 true true
Asia: [2016-03-30T12:00 2020-03-30T:10:15, 2019-01-10 2020-03-01, 2020-03-27T10:00 2020-03-28T10:00, 2016-03-30T12:00 2020-03-30T10:15]
Adam: [2018-01-01 2020-03-27, 2019-01-01 2020-02-28, 2019-01-01 2019-02-29, 2020-03-28T10:00 2020-03-29T10:00]

Asia
*** java.time.format.DateTimeParseException: Text '2020-03-30T:10:15' could not be parsed, unparsed text found at index 10
Od 10 stycznia 2019 (czwartek) do 1 marca 2020 (niedziela)
- mija: 416.0 dni, tygodni 59.43
- kalendarzowo: 1 rok, 1 miesi�c, 20 dni
Od 27 marca 2020 (pi�tek) godz. 10:00 do 28 marca 2020 (sobota) godz. 10:00
 - mija: 1 dzie�, tygodni 0.14
- godzin: 24, minut: 1440
- kalendarzowo: 1 dzie�
Od 30 marca 2016 (�roda) godz. 12:00 do 30 marca 2020 (poniedzia�ek) godz. 10:15
- mija: 1460 dni, tygodni 208.57
- godzin: 35062, minut: 2103735
 - kalendarzowo: 4 lata
Adam
Od 1 stycznia 2018 (poniedzia�ek) do 27 marca 2020 (pi�tek)
 - mija: 816.0 dni, tygodni 116.57
 - kalendarzowo: 2 lata, 2 miesi�ce, 26 dni
Od 1 stycznia 2019 (wtorek) do 28 lutego 2020 (pi�tek)
 - mija: 423.0 dni, tygodni 60.43
 - kalendarzowo: 1 rok, 1 miesi�c, 27 dni
*** java.time.format.DateTimeParseException: Text '2019-02-29' could not be parsed: Invalid   date 'February 29' as '2019' is not a leap year
Od 28 marca 2020 (sobota) godz. 10:00 do 29 marca 2020 (niedziela) godz. 10:00
 - mija: 1 dzie�, tygodni 0.14
 - godzin: 23, minut: 1380
 - kalendarzowo: 1 dzie�

What I Learned

• serverSocketChannel
• socketChannel
• localDate
• DecimalFormat
• ZonedDateTime
• LinkedHashMap
• yaml files