org.apache.hadoop.lib.servlet
Class ServerWebApp

java.lang.Object
  org.apache.hadoop.lib.server.Server
      org.apache.hadoop.lib.servlet.ServerWebApp

All Implemented Interfaces:

EventListener, javax.servlet.ServletContextListener

Direct Known Subclasses:

HttpFSServerWebApp

@InterfaceAudience.Private
public abstract class ServerWebApp
extends Server
implements javax.servlet.ServletContextListener

Server subclass that implements ServletContextListener and uses its lifecycle to start and stop the server.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.lib.server.Server

Server.Status

Field Summary

static String

SSL_ENABLED

Fields inherited from class org.apache.hadoop.lib.server.Server

CONF_SERVICES, CONF_SERVICES_EXT, CONF_STARTUP_STATUS, DEFAULT_LOG4J_PROPERTIES

Constructor Summary

	ServerWebApp(String name) Constructor.
protected	ServerWebApp(String name, String homeDir, org.apache.hadoop.conf.Configuration config) Constructor for testing purposes.
protected	ServerWebApp(String name, String homeDir, String configDir, String logDir, String tempDir, org.apache.hadoop.conf.Configuration config) Constructor for testing purposes.

Method Summary

void	contextDestroyed(javax.servlet.ServletContextEvent event) Destroys the ServletContextListener which destroys the Server.
void	contextInitialized(javax.servlet.ServletContextEvent event) Initializes the ServletContextListener which initializes the Server.
InetSocketAddress	getAuthority() Returns the hostname:port InetSocketAddress the webserver is listening to.
boolean	isSslEnabled()
protected InetSocketAddress	resolveAuthority() Resolves the host & port InetSocketAddress the web server is listening to.
void	setAuthority(InetSocketAddress authority) Sets an alternate hostname:port InetSocketAddress to use.
static void	setHomeDirForCurrentThread(String homeDir) Method for testing purposes.

Methods inherited from class org.apache.hadoop.lib.server.Server

checkServiceDependencies, destroy, destroyServices, ensureOperational, get, getConfig, getConfigDir, getHomeDir, getLogDir, getName, getPrefix, getPrefixedName, getStatus, getTempDir, init, initConfig, initLog, initServices, loadServices, setService, setStatus

Methods inherited from class java.lang.Object

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

Field Detail

SSL_ENABLED

public static final String SSL_ENABLED

See Also:

Constant Field Values

Constructor Detail

ServerWebApp

protected ServerWebApp(String name,
                       String homeDir,
                       String configDir,
                       String logDir,
                       String tempDir,
                       org.apache.hadoop.conf.Configuration config)

Constructor for testing purposes.

ServerWebApp

protected ServerWebApp(String name,
                       String homeDir,
                       org.apache.hadoop.conf.Configuration config)

Constructor for testing purposes.

ServerWebApp

public ServerWebApp(String name)

Constructor. Subclasses must have a default constructor specifying the server name.

The server name is used to resolve the Java System properties that define the server home, config, log and temp directories.

The home directory is looked in the Java System property #SERVER_NAME#.home.dir.

The config directory is looked in the Java System property #SERVER_NAME#.config.dir, if not defined it resolves to the #SERVER_HOME_DIR#/conf directory.

The log directory is looked in the Java System property #SERVER_NAME#.log.dir, if not defined it resolves to the #SERVER_HOME_DIR#/log directory.

The temp directory is looked in the Java System property #SERVER_NAME#.temp.dir, if not defined it resolves to the #SERVER_HOME_DIR#/temp directory.

Parameters:

name - server name.

Method Detail

setHomeDirForCurrentThread

public static void setHomeDirForCurrentThread(String homeDir)

Method for testing purposes.

contextInitialized

public void contextInitialized(javax.servlet.ServletContextEvent event)

Initializes the ServletContextListener which initializes the Server.

Specified by:

contextInitialized in interface javax.servlet.ServletContextListener

Parameters:

event - servelt context event.

resolveAuthority

protected InetSocketAddress resolveAuthority()
                                      throws ServerException

Resolves the host & port InetSocketAddress the web server is listening to.

This implementation looks for the following 2 properties:

• #SERVER_NAME#.http.hostname
• #SERVER_NAME#.http.port

Returns:

the host & port InetSocketAddress the web server is listening to.

Throws:

ServerException - thrown if any of the above 2 properties is not defined.

contextDestroyed

public void contextDestroyed(javax.servlet.ServletContextEvent event)

Destroys the ServletContextListener which destroys the Server.

Specified by:

contextDestroyed in interface javax.servlet.ServletContextListener

Parameters:

event - servelt context event.

getAuthority

public InetSocketAddress getAuthority()
                               throws ServerException

Returns the hostname:port InetSocketAddress the webserver is listening to.

Returns:

the hostname:port InetSocketAddress the webserver is listening to.

Throws:

ServerException

setAuthority

public void setAuthority(InetSocketAddress authority)

Sets an alternate hostname:port InetSocketAddress to use.

For testing purposes.

Parameters:

authority - alterante authority.

isSslEnabled

public boolean isSslEnabled()