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package com.sun.net.httpserver.spi;
import java.io.FileDescriptor;
import java.io.IOException;
import java.net.*;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Iterator;
import java.util.ServiceLoader;
import sun.misc.ServiceConfigurationError;
import sun.security.action.GetPropertyAction;
import com.sun.net.httpserver.*;
Service provider class for HttpServer. Sub-classes of HttpServerProvider provide an implementation of HttpServer and associated classes. Applications do not normally use this class. See provider() for how providers are found and loaded. /**
* Service provider class for HttpServer.
* Sub-classes of HttpServerProvider provide an implementation of {@link HttpServer} and
* associated classes. Applications do not normally use this class.
* See {@link #provider()} for how providers are found and loaded.
*/
public abstract class HttpServerProvider {
creates a HttpServer from this provider
Params: - addr – the address to bind to. May be
null - backlog – the socket backlog. A value of
zero means the systems default
/**
* creates a HttpServer from this provider
* @param addr the address to bind to. May be <code>null</code>
* @param backlog the socket backlog. A value of <code>zero</code> means the systems default
*/
public abstract HttpServer createHttpServer (InetSocketAddress addr, int backlog) throws IOException;
creates a HttpsServer from this provider
Params: - addr – the address to bind to. May be
null - backlog – the socket backlog. A value of
zero means the systems default
/**
* creates a HttpsServer from this provider
* @param addr the address to bind to. May be <code>null</code>
* @param backlog the socket backlog. A value of <code>zero</code> means the systems default
*/
public abstract HttpsServer createHttpsServer (InetSocketAddress addr, int backlog) throws IOException;
private static final Object lock = new Object();
private static HttpServerProvider provider = null;
Initializes a new instance of this class.
Throws: - SecurityException – If a security manager has been installed and it denies
RuntimePermission("httpServerProvider")
/**
* Initializes a new instance of this class. </p>
*
* @throws SecurityException
* If a security manager has been installed and it denies
* {@link RuntimePermission}<tt>("httpServerProvider")</tt>
*/
protected HttpServerProvider() {
SecurityManager sm = System.getSecurityManager();
if (sm != null)
sm.checkPermission(new RuntimePermission("httpServerProvider"));
}
private static boolean loadProviderFromProperty() {
String cn = System.getProperty("com.sun.net.httpserver.HttpServerProvider");
if (cn == null)
return false;
try {
Class<?> c = Class.forName(cn, true,
ClassLoader.getSystemClassLoader());
provider = (HttpServerProvider)c.newInstance();
return true;
} catch (ClassNotFoundException |
IllegalAccessException |
InstantiationException |
SecurityException x) {
throw new ServiceConfigurationError(x);
}
}
private static boolean loadProviderAsService() {
Iterator<HttpServerProvider> i =
ServiceLoader.load(HttpServerProvider.class,
ClassLoader.getSystemClassLoader())
.iterator();
for (;;) {
try {
if (!i.hasNext())
return false;
provider = i.next();
return true;
} catch (ServiceConfigurationError sce) {
if (sce.getCause() instanceof SecurityException) {
// Ignore the security exception, try the next provider
continue;
}
throw sce;
}
}
}
Returns the system wide default HttpServerProvider for this invocation of
the Java virtual machine.
The first invocation of this method locates the default provider
object as follows:
If the system property
com.sun.net.httpserver.HttpServerProvider is defined then it is
taken to be the fully-qualified name of a concrete provider class.
The class is loaded and instantiated; if this process fails then an
unspecified unchecked error or exception is thrown.
If a provider class has been installed in a jar file that is
visible to the system class loader, and that jar file contains a
provider-configuration file named
com.sun.net.httpserver.HttpServerProvider in the resource
directory META-INF/services, then the first class name
specified in that file is taken. The class is loaded and
instantiated; if this process fails then an unspecified unchecked error or exception is
thrown.
Finally, if no provider has been specified by any of the above
means then the system-default provider class is instantiated and the
result is returned.
Subsequent invocations of this method return the provider that was
returned by the first invocation.
Returns: The system-wide default HttpServerProvider
/**
* Returns the system wide default HttpServerProvider for this invocation of
* the Java virtual machine.
*
* <p> The first invocation of this method locates the default provider
* object as follows: </p>
*
* <ol>
*
* <li><p> If the system property
* <tt>com.sun.net.httpserver.HttpServerProvider</tt> is defined then it is
* taken to be the fully-qualified name of a concrete provider class.
* The class is loaded and instantiated; if this process fails then an
* unspecified unchecked error or exception is thrown. </p></li>
*
* <li><p> If a provider class has been installed in a jar file that is
* visible to the system class loader, and that jar file contains a
* provider-configuration file named
* <tt>com.sun.net.httpserver.HttpServerProvider</tt> in the resource
* directory <tt>META-INF/services</tt>, then the first class name
* specified in that file is taken. The class is loaded and
* instantiated; if this process fails then an unspecified unchecked error or exception is
* thrown. </p></li>
*
* <li><p> Finally, if no provider has been specified by any of the above
* means then the system-default provider class is instantiated and the
* result is returned. </p></li>
*
* </ol>
*
* <p> Subsequent invocations of this method return the provider that was
* returned by the first invocation. </p>
*
* @return The system-wide default HttpServerProvider
*/
public static HttpServerProvider provider () {
synchronized (lock) {
if (provider != null)
return provider;
return (HttpServerProvider)AccessController
.doPrivileged(new PrivilegedAction<Object>() {
public Object run() {
if (loadProviderFromProperty())
return provider;
if (loadProviderAsService())
return provider;
provider = new sun.net.httpserver.DefaultHttpServerProvider();
return provider;
}
});
}
}
}