Rosalie Stevenson's Messaging Hub For Sockets

Description of Messaging Hub Base Code

• Creates socket at port 5000
• Creates an asynchronous runnable task when a connection is accepted to this port.
• Runs said asynchronous task in executable thread pool.
• Assigns connection to to an arbitrary random number as a user id.
• Adds id to synchronized list of user ids.
• Adds output writer in socket handler to hash map, mapped to user id.
• Checks that the command input by the connection matches one of the following commands:

1. Who Am I?
2. Who is here?
3. Send message to other_connections

• In the case that the command does not match one of the listed commands, print error message.

Tests

Identity Test Positive Scenario

• Creates connection with port 5000
• Sends single "Who Am I?" request
• Ensures that id is returned from hub in the case of this request.
• Ensures that a connection is able to exit by emitting "."

List Test Positive Scenario

• Creates two connections to port 5000
• Checks id of first and second connections by sending "Who Am I?" requests.
• Uses second connection to emit "Who is here?" request.
• Ensure that first ID is included in responding array and that second ID is excluded.

List Test Single Connection

• Creates single connection to port 5000.
• Emits "Who is here?" request.
• Ensure that empty array responds to request for user ID array.

Relay Message Test Closed Connections

• Creates three connections to port 5000.
• Emits "Who is here?" request through third connection.
• Closes first and second connections.
• Attempts to send messages to remaining connections by emitting "Send foobar to" request.
• Checks that both the first and second connections receive "foobar".
• Checks that sending these messages does not cause an error.

Relay Messages Non-Existent Connections

• Creates three connections to port 5000
• Alters ids associated with these connections by adding a single increment to them.
• Attempt to send messages to these particular incremented, non-existent connections.
• Ensures that the message retrieved from the hub matches an expected error message.

Relay Message Test Positive Scenario

• Create three connections to port 5000
• Uses 1st connection to get user ids associated with other connections.
• Sends "foobar" to the other two connections.
• Ensures that other two connections receive the "foobar" message.