edu.virginia.cs.mng.hypercast
Class HTTP_Server

java.lang.Object
  |
  +--edu.virginia.cs.mng.hypercast.HTTP_Server

public final class HTTP_Server

extends java.lang.Object

Field Summary

private static int	MAX_BACKLOG Required argument to constructor of java.net.ServerSocket
private int	maxNumberOfRequestsInAnySecond Statistic.
private int	maxNumberOfResponsesInAnySecond Statistic.
private static int	NUM_OF_HTTP_THREADS Number of threads to handle HTTP requests.
private int	numberOfErrorResponses Statistic.
private int	numberOfRequests Statistic.
private int	numberOfResponses Statistic.
(package private) HTTP_ServerOverlayHandler	overlayHandler to handle the overlay request
private java.util.Vector	requestTimeQueue Vector of Long.
private java.util.Vector	responseTimeQueue Vector of Long.
java.net.ServerSocket	serverSocket Socket for new connections.
(package private) static java.lang.String	uniquePrefix used to generate unique Overlay ID

Constructor Summary

(package private)

HTTP_Server(int port) Attempts to open a ServerSocket at port.

Method Summary

java.net.Socket	acceptConnection() Accept a connection from the server socket.
private java.lang.String	homePage() Prints a simple homepage that has forms for accessing data on server.
static void	main(java.lang.String[] args) Initializes and starts the web server.
private static java.util.Hashtable	parseAttributes(java.lang.String s) Reads a string of CGI URL-encoded values and places them into a hashtable.
java.lang.String	processQuery(java.util.StringTokenizer queryLineTokens) Accepts HTTP requests and passes them to the overlayHandler.
static int	purgeQueue(java.util.Vector v, long t) Clears the queue of all elements older than 1 second from t.
private void	purgeQueues(long t) Clears the queues of all elements older than 1 second from t.
private java.lang.String	statsPage() Prints a simple webpage with the server's statistics server.

Methods inherited from class java.lang.Object

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

Field Detail

NUM_OF_HTTP_THREADS

private static int NUM_OF_HTTP_THREADS

Number of threads to handle HTTP requests.

numberOfRequests

private int numberOfRequests

Statistic.

numberOfResponses

private int numberOfResponses

Statistic.

numberOfErrorResponses

private int numberOfErrorResponses

Statistic.

maxNumberOfRequestsInAnySecond

private int maxNumberOfRequestsInAnySecond

Statistic.

maxNumberOfResponsesInAnySecond

private int maxNumberOfResponsesInAnySecond

Statistic.

requestTimeQueue

private java.util.Vector requestTimeQueue

Vector of Long. Times of requests - ordered from oldest to newest.

responseTimeQueue

private java.util.Vector responseTimeQueue

Vector of Long. Times of requests - ordered from oldest to newest.

serverSocket

public java.net.ServerSocket serverSocket

Socket for new connections.

MAX_BACKLOG

private static final int MAX_BACKLOG

Required argument to constructor of java.net.ServerSocket

uniquePrefix

static java.lang.String uniquePrefix

used to generate unique Overlay ID

overlayHandler

HTTP_ServerOverlayHandler overlayHandler

to handle the overlay request

Constructor Detail

HTTP_Server

HTTP_Server(int port)

Attempts to open a ServerSocket at port. If it fails to open the socket, it exits.

Method Detail

main

public static void main(java.lang.String[] args)

Initializes and starts the web server. The overlayHandler takes care of overlay requests.

acceptConnection

public java.net.Socket acceptConnection()
                                 throws java.io.IOException

Accept a connection from the server socket. For some reason, Java doesn't list accept as a synchronized method.

processQuery

public java.lang.String processQuery(java.util.StringTokenizer queryLineTokens)

Accepts HTTP requests and passes them to the overlayHandler.

parseAttributes

private static java.util.Hashtable parseAttributes(java.lang.String s)

Reads a string of CGI URL-encoded values and places them into a hashtable.

homePage

private java.lang.String homePage()

Prints a simple homepage that has forms for accessing data on server.

statsPage

private java.lang.String statsPage()

Prints a simple webpage with the server's statistics server.

purgeQueues

private void purgeQueues(long t)

Clears the queues of all elements older than 1 second from t.

purgeQueue

public static int purgeQueue(java.util.Vector v,
                             long t)

Clears the queue of all elements older than 1 second from t.