ec.exchange

Class IslandExchangeServer

java.lang.Object

ec.exchange.IslandExchangeServer

All Implemented Interfaces:

Runnable

 class IslandExchangeServer
extends Object
implements Runnable

The IslandExchangeServer is the class that manages the main server that coordinates all the islands. The class implements Runnable (for running on a different thread).

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	IslandExchangeServer.IslandExchangeIslandInfo A class indicating all the information the server knows about a given island, including its mod, size, offset, and all the migrating islands it hooks to, etc.

Field Summary

Fields

Modifier and Type	Field and Description
(package private) String[]	connected_island_ids
static String	FOUND The found message
static int	FOUND_TIMEOUT How much to wait for the found message (on a non-blocking socket)
static String	GOODBYE The final message to be sent to all islands when an individual has been found
(package private) Hashtable	info
(package private) Hashtable	info_immigrants
(package private) String[]	island_ids
static int	ISLAND_INDEX_LOOKUP_FAILED
static Parameter	islandIndexBase
static Parameter	islandIndexNumIslands
(package private) int	numIslands
static String	OKAY The okay message
static String	P_ID The id
static String	P_ISLAND The parameter for the island's information
static String	P_MAILBOX_CAPACITY The size of the mailbox (for each of the subpopulations)
static String	P_MIGRATING_ISLAND the parameter for migrating islands' ids
static String	P_MODULO The parameter for the modulo (how many generations should pass between consecutive sendings of individuals
static String	P_NUM_INCOMING_MIGRATING_COUNTRIES
static String	P_NUM_ISLANDS The number of islands
static String	P_NUM_MIGRATING_COUNTRIES The number of islands where immigrants will be sent
static String	P_OFFSET How many generations to pass at the beginning of the evolution before the first emigration from the current island
static String	P_SERVER_PORT The server port
static String	P_SIZE The number of immigrants to be sent
static String	P_SYNCHRONOUS Whether the execution should be synchronous or asynchronous
static String	RUN The run message to be sent to the clients
(package private) int	serverPort
(package private) ServerSocket	serverSocket
static int	SLEEP_TIME How much to sleep between checking for a FOUND message
(package private) EvolutionState	state
static String	SYNC The synchronize message
(package private) boolean	synchronous
(package private) boolean[]	who_is_synchronized

Constructor Summary

Constructors

Constructor and Description
IslandExchangeServer()

Method Summary

Methods

Modifier and Type	Method and Description
int	getIslandIndex(EvolutionState state, String id) Looks up the island id in the parameter database, assuming something like exch.island.1.id = GilligansIsland Then returns the index number (in the example before, this would be 1).
void	run() The main function running in the thread
void	setupServerFromDatabase(EvolutionState state_p, Parameter base) This setup should get called from the IslandExchange setup method.
Thread	spawnThread() Here we spawn off the thread on ourselves

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

P_SERVER_PORT

public static final String P_SERVER_PORT

The server port

See Also:

Constant Field Values

P_NUM_ISLANDS

public static final String P_NUM_ISLANDS

The number of islands

See Also:

Constant Field Values

P_ISLAND

public static final String P_ISLAND

The parameter for the island's information

See Also:

Constant Field Values

P_ID

public static final String P_ID

The id

See Also:

Constant Field Values

P_NUM_INCOMING_MIGRATING_COUNTRIES

public static final String P_NUM_INCOMING_MIGRATING_COUNTRIES

See Also:

Constant Field Values

P_NUM_MIGRATING_COUNTRIES

public static final String P_NUM_MIGRATING_COUNTRIES

The number of islands where immigrants will be sent

See Also:

Constant Field Values

P_MIGRATING_ISLAND

public static final String P_MIGRATING_ISLAND

the parameter for migrating islands' ids

See Also:

Constant Field Values

P_MAILBOX_CAPACITY

public static final String P_MAILBOX_CAPACITY

The size of the mailbox (for each of the subpopulations)

See Also:

Constant Field Values

P_MODULO

public static final String P_MODULO

The parameter for the modulo (how many generations should pass between consecutive sendings of individuals

See Also:

Constant Field Values

P_SIZE

public static final String P_SIZE

The number of immigrants to be sent

See Also:

Constant Field Values

P_OFFSET

public static final String P_OFFSET

How many generations to pass at the beginning of the evolution before the first emigration from the current island

See Also:

Constant Field Values

P_SYNCHRONOUS

public static final String P_SYNCHRONOUS

Whether the execution should be synchronous or asynchronous

See Also:

Constant Field Values

RUN

public static final String RUN

The run message to be sent to the clients

See Also:

Constant Field Values

FOUND_TIMEOUT

public static final int FOUND_TIMEOUT

How much to wait for the found message (on a non-blocking socket)

See Also:

Constant Field Values

SLEEP_TIME

public static final int SLEEP_TIME

How much to sleep between checking for a FOUND message

See Also:

Constant Field Values

GOODBYE

public static final String GOODBYE

The final message to be sent to all islands when an individual has been found

See Also:

Constant Field Values

FOUND

public static final String FOUND

The found message

See Also:

Constant Field Values

OKAY

public static final String OKAY

The okay message

See Also:

Constant Field Values

SYNC

public static final String SYNC

The synchronize message

See Also:

Constant Field Values

numIslands

int numIslands

serverPort

int serverPort

serverSocket

ServerSocket serverSocket

info

Hashtable info

info_immigrants

Hashtable info_immigrants

state

EvolutionState state

island_ids

String[] island_ids

connected_island_ids

String[] connected_island_ids

synchronous

boolean synchronous

who_is_synchronized

boolean[] who_is_synchronized

ISLAND_INDEX_LOOKUP_FAILED

public static final int ISLAND_INDEX_LOOKUP_FAILED

See Also:

Constant Field Values

islandIndexBase

public static final Parameter islandIndexBase

islandIndexNumIslands

public static final Parameter islandIndexNumIslands

Constructor Detail

IslandExchangeServer

IslandExchangeServer()

Method Detail

setupServerFromDatabase

public void setupServerFromDatabase(EvolutionState state_p,
                           Parameter base)

This setup should get called from the IslandExchange setup method.

run

public void run()

The main function running in the thread

Specified by:

run in interface Runnable

spawnThread

public Thread spawnThread()

Here we spawn off the thread on ourselves

getIslandIndex

public int getIslandIndex(EvolutionState state,
                 String id)

Looks up the island id in the parameter database, assuming something like exch.island.1.id = GilligansIsland Then returns the index number (in the example before, this would be 1). If there is no such island in the parameter database using this parameter format, then returns ISLAND_INDEX_LOOKUP_FAILED and issues a one-time warning. NOTE: This algorithm is O(n) for the number of islands. No, it's not fast, but with a small number of islands, it's not a big deal.