com.sun.net.httpserver.spi.HttpServerProvider Maven / Gradle / Ivy
/*
* @(#)HttpServerProvider.java 1.4 07/01/02
*
* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
* SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*/
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 sun.misc.Service;
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 {@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
* @param addr the address to bind to. May be null
* @param backlog the socket backlog. A value of zero means the systems default
*/
public abstract HttpServer createHttpServer (InetSocketAddress addr, int backlog) throws IOException;
/**
* creates a HttpsServer from this provider
* @param addr the address to bind to. May be null
* @param backlog the socket backlog. A value of zero 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
* {@link RuntimePermission}("httpServerProvider")
*/
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 x) {
throw new ServiceConfigurationError(x);
} catch (IllegalAccessException x) {
throw new ServiceConfigurationError(x);
} catch (InstantiationException x) {
throw new ServiceConfigurationError(x);
} catch (SecurityException x) {
throw new ServiceConfigurationError(x);
}
}
private static boolean loadProviderAsService() {
Iterator i = Service.providers(HttpServerProvider.class,
ClassLoader.getSystemClassLoader());
for (;;) {
try {
if (!i.hasNext())
return false;
provider = (HttpServerProvider)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.
*
* @return The system-wide default HttpServerProvider
*/
public static HttpServerProvider provider () {
synchronized (lock) {
if (provider != null)
return provider;
return (HttpServerProvider)AccessController
.doPrivileged(new PrivilegedAction