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Class w3c.www.protocol.http.HttpManager

java.lang.Object
   |
   +----w3c.www.protocol.http.HttpManager

public class HttpManager

extends Object

implements PropertyMonitoring

 HttpManager     manager = HttpManager.getManager() ;
 Request request = manager.makeRequest() ;
 request.setMethod(HTTP.GET) ;
 request.setURL(new URL("http://www.w3.org/pub/WWW/"));
 Reply    reply = manager.runRequest(request) ;
 // Get the reply input stream that contains the actual data:
 InputStream in = reply.getInputStream() ;
 ...
 

ACCEPT_ENCODING_P

Header properties - Set the accept encodings.

ACCEPT_LANGUAGE_P

Header properties - Set the accept language.

ACCEPT_P

Header properties - Set the accept header.

conn_count

conn_max

CONN_MAX_P

The maximum number of simultaneous connections.

connectionsLru

The LRU list of connections.

DEFAULT_ACCEPT

The default value for the Accept header.

DEFAULT_USER_AGENT

The default value for the User-Agent header.

FILTERS_PROP_P

The name of the property containing the ProprequestFilter to launch.

MAX_STALE_P

Header properties - The allowed drift for getting cached resources.

MIN_FRESH_P

Header properties - The minium freshness required on cached resources.

ONLY_IF_CACHED_P

Header properties - Set the only if cached flag on requests.

PROXY_HOST_P

Header properties - What is the proxy host name.

PROXY_PORT_P

Header properties - What is the proxy port number.

PROXY_SET_P

Header properties - Should we use a proxy ?

SERVER_CLASS_P

The name of the property indicating the class of HttpServer to use.

serverclass

The class to instantiate to create new HttpServer instances.

servers

The server this manager knows about, indexed by FQDN of target servers.

template

The template request (the request we will clone to create new requests)

timeout

TIMEOUT_P

The SO_TIMEOUT of the client socket.

USER_AGENT_P

Header properties - Set the user agent.

HttpManager()

Create a new HttpManager.

closeAnyConnection()

Close one connection, but pickling the least recently used one.

createRequest()

Create a new default outgoing request.

decrConnCount(HttpServer)

Decrement the number of established connections.

deleteConnection(HttpConnection)

The given connection has been deleted.

getConnection(HttpServer)

Try reusing one of the idle connection of that server, if any.

getGlobalFilter(Class)

Find back an instance of a global filter.

getGlobalHeader(String)

Global settings - Get a global request header default value.

getManager()

getManager(Properties)

Get an instance of the HTTP manager.

getProperties()

Get this manager properties.

getReplyFactory()

getServerKey(Request)

Get the String key for the server instance handling that request.

incrConnCount(HttpServer)

A new client connection has been established.

lookupServer(String, int)

Get the appropriate server object for handling request to given target.

main(String[])

DEBUGGING !

negotiateConnection(HttpServer)

One of our server handler wants to open a connection.

notifyConnection(HttpConnection)

The given connection has just been created.

notifyIdle(HttpConnection)

The given connection can be reused, but is now idle.

notifyUse(HttpConnection)

The given connection is about to be used.

propertyChanged(String)

PropertyMonitoring implementation - Update properties on the fly !

runRequest(Request)

Run the given request, in synchronous mode.

setAllowUserInteraction(boolean)

Allow the manager to interact with the user if needed.

setFilter(RequestFilter)

Add a global filter.

setFilter(URL[], URL[], RequestFilter)

Add a new request filter.

setGlobalHeader(String, String)

Global settings - Define a global request header.

setMaxConnections(int)

Global settings - Set the max number of allowed connections.

setProxy(URL)

Global settings - Set an optional proxy to use.

setRequestTimeout(int)

Global settings - Set the request timeout.

setTimeout(int)

Global settings - Set the timeout on the socket

This value defaults to the value of the w3c.www.http.Timeout property.

sync()

Dump all in-memory cached state to persistent storage.

tooManyConnections()

updateProxy()

Update the proxy configuration to match current properties setting.

usingProxy()

Does this manager uses a proxy to fulfill requests ?

waitForConnection(HttpServer)

 public static final String SERVER_CLASS_P

The name of the property indicating the class of HttpServer to use.

 public static final String FILTERS_PROP_P

The name of the property containing the ProprequestFilter to launch.

 public static final String CONN_MAX_P

The maximum number of simultaneous connections.

 public static final String TIMEOUT_P

The SO_TIMEOUT of the client socket.

 public static final String MAX_STALE_P

Header properties - The allowed drift for getting cached resources.

 public static final String MIN_FRESH_P

Header properties - The minium freshness required on cached resources.

 public static final String ONLY_IF_CACHED_P

Header properties - Set the only if cached flag on requests.

 public static final String USER_AGENT_P

Header properties - Set the user agent.

 public static final String ACCEPT_P

Header properties - Set the accept header.

 public static final String ACCEPT_LANGUAGE_P

Header properties - Set the accept language.

 public static final String ACCEPT_ENCODING_P

Header properties - Set the accept encodings.

 public static final String PROXY_SET_P

Header properties - Should we use a proxy ?

 public static final String PROXY_HOST_P

Header properties - What is the proxy host name.

 public static final String PROXY_PORT_P

Header properties - What is the proxy port number.

 public static final String DEFAULT_ACCEPT

The default value for the Accept header.

 public static final String DEFAULT_USER_AGENT

The default value for the User-Agent header.

 protected Class serverclass

The class to instantiate to create new HttpServer instances.

 protected Hashtable servers

The server this manager knows about, indexed by FQDN of target servers.

 protected Request template

The template request (the request we will clone to create new requests)

 protected LRUList connectionsLru

The LRU list of connections.

 protected int timeout

 protected int conn_count

 protected int conn_max

 protected HttpManager()

Create a new HttpManager. FIXME Making this method protected breaks the static method to create HttpManager instances (should use a factory here)

Parameters:

props - The properties from which the manager should initialize itself, or null if none are available.

 protected boolean updateProxy()

Update the proxy configuration to match current properties setting.

Returns:

A boolean, true if change was done, false otherwise.

 public final ObservableProperties getProperties()

Get this manager properties.

Returns:

An ObservableProperties instance.

 public boolean propertyChanged(String name)

PropertyMonitoring implementation - Update properties on the fly !

Parameters:

name - The name of the property that has changed.

Returns:

A boolean, true if change is accepted, false otherwise.

 public void setAllowUserInteraction(boolean onoff)

Allow the manager to interact with the user if needed. This will, for example, allow prompting for paswords, etc.

Parameters:

onoff - Turn interaction on or off.

 public static synchronized HttpManager getManager(Properties p)

Get an instance of the HTTP manager. This method returns an actual instance of the HTTP manager. It may return different managers, if it decides to distribute the load on different managers (avoid the HttpManager being a bottleneck).

Returns:

An application wide instance of the HTTP manager.

 public static HttpManager getManager()

 public final String getServerKey(Request request)

Get the String key for the server instance handling that request. This method takes care of any proxy setting (it will return the key to the proxy when required.)

Returns:

A uniq identifier for the handling server, as a String.

 protected synchronized HttpServer lookupServer(String host,
                                                int port) throws HttpException

Get the appropriate server object for handling request to given target.

Parameters:

key - The server's key, as returned by getServerKey.

Returns:

An object complying to the HttpServer interface.

Throws: HttpException

If the given host name couldn't be resolved.

 public void notifyUse(HttpConnection conn)

The given connection is about to be used. Update our list of available servers.

Parameters:

conn - The idle connection.

 public void notifyIdle(HttpConnection conn)

The given connection can be reused, but is now idle.

Parameters:

conn - The connection that is now idle.

 protected synchronized void notifyConnection(HttpConnection conn)

The given connection has just been created.

Parameters:

conn - The newly created connection.

 protected void deleteConnection(HttpConnection conn)

The given connection has been deleted.

Parameters:

conn - The deleted connection.

 protected synchronized boolean tooManyConnections()

 protected HttpConnection getConnection(HttpServer server)

Try reusing one of the idle connection of that server, if any.

Parameters:

server - The target server.

Returns:

An currently idle connection to the given server.

 protected synchronized void waitForConnection(HttpServer server) throws InterruptedException

 protected boolean closeAnyConnection()

Close one connection, but pickling the least recently used one.

Returns:

A boolean, true if a connection was closed false otherwise.

 protected boolean negotiateConnection(HttpServer server)

One of our server handler wants to open a connection.

Parameters:

block - A boolean indicating whether we should block the calling thread until a token is available (otherwise, the method will just peek at the connection count, and return the appropriate result).

Returns:

A boolean, true if the connection can be opened straight, false otherwise.

 protected final synchronized void incrConnCount(HttpServer server)

A new client connection has been established. This method will try to maintain a maximum number of established connections, by closing idle connections when possible.

Parameters:

server - The server that has established a new connection.

 protected final synchronized void decrConnCount(HttpServer server)

Decrement the number of established connections.

Parameters:

server - The server that has closed one connection to its target.

 public Reply runRequest(Request request) throws HttpException

Run the given request, in synchronous mode. This method will launch the given request, and block the calling thread until the response headers are available.

Parameters:

request - The request to run.

Returns:

An instance of Reply, containing all the reply informations.

Throws: HTTPException

If something failed during request processing.

 public MimeParserFactory getReplyFactory()

 public void setFilter(URL incs[],
                       URL exs[],
                       RequestFilter filter)

Add a new request filter. Request filters are called before a request is launched, and after the reply headers are available. They allow applications to setup specific request headers (such as PICS, or PEP stuff) on the way in, and check the reply on the way out.

Request filters are application wide: if their scope matches the current request, then they will always be aplied.

Filter scopes are defined inclusively and exclusively

Parameters:

incs - The URL domains for which the filter should be triggered.

exs - The URL domains for which the filter should not be triggered.

filter - The request filter to add.

 public void setFilter(RequestFilter filter)

Add a global filter. The given filter will always be invoked.

Parameters:

filter - The filter to install.

 public RequestFilter getGlobalFilter(Class cls)

Find back an instance of a global filter. This methods allow external classes to get a pointer to installed filters of a given class.

Parameters:

cls - The class of the filter to look for.

Returns:

A RequestFilter instance, or null if not found.

 public Request createRequest()

Create a new default outgoing request. This method should always be used to create outgoing requests. It will initialize the request with appropriate default values for the various headers, and make sure that the request is enhanced by the registered request filters.

Returns:

An instance of Request, suitable to be launched.

 public synchronized void setMaxConnections(int max_conn)

Global settings - Set the max number of allowed connections. Set the maximum number of simultaneous connections that can remain opened. The manager will take care of queuing requests if this number is reached.

This value defaults to the value of the w3c.www.http.maxConnections property.

Parameters:

max_conn - The allowed maximum simultaneous open connections.

 public synchronized void setTimeout(int timeout)

Global settings - Set the timeout on the socket

This value defaults to the value of the w3c.www.http.Timeout property.

Parameters:

timeout - The allowed maximum microsecond before a timeout.

 public void setProxy(URL proxy)

Global settings - Set an optional proxy to use. Set the proxy to which all requests should be targeted. If the w3c.www.http.proxy property is defined, it will be used as the default value.

Parameters:

proxy - The URL for the proxy to use.

 public boolean usingProxy()

Does this manager uses a proxy to fulfill requests ?

Returns:

A boolean.

 public void setRequestTimeout(int ms)

Global settings - Set the request timeout. Once a request has been emited, the HttpManager will sit for this given number of milliseconds before the request is declared to have timed-out.

This timeout value defaults to the value of the w3c.www.http.requestTimeout property value.

Parameters:

ms - The timeout value in milliseconds.

 public void setGlobalHeader(String name,
                             String value)

Global settings - Define a global request header. Set a default value for some request header. Once defined, the header will automatically be defined on all outgoing requests created through the createRequest request.

Parameters:

name - The name of the header, case insensitive.

value - It's default value.

 public String getGlobalHeader(String name)

Global settings - Get a global request header default value.

Parameters:

name - The name of the header to get.

Returns:

The value for that header, as a String, or null if undefined.

 public void sync()

Dump all in-memory cached state to persistent storage.

 public static void main(String args[])

DEBUGGING !

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