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8236246: SelectorProvider support for creating a DatagramChannel that is not interruptible

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Reviewed-by: chegar
This commit is contained in:
Alan Bateman 2019-12-20 09:28:57 +00:00
parent d1ad0eaf8f
commit c6a4cea7a0
11 changed files with 350 additions and 109 deletions
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110
src/java.base/share/classes/java/nio/channels/spi/SelectorProvider.java
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@ -26,15 +26,18 @@
package java.nio.channels.spi;
import java.io.IOException;
import java.lang.reflect.InvocationTargetException;
import java.net.ProtocolFamily;
import java.nio.channels.*;
import java.nio.channels.Channel;
import java.nio.channels.DatagramChannel;
import java.nio.channels.Pipe;
import java.nio.channels.ServerSocketChannel;
import java.nio.channels.SocketChannel;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Iterator;
import java.util.ServiceLoader;
import java.util.ServiceConfigurationError;
import sun.security.action.GetPropertyAction;
/**
* Service-provider class for selectors and selectable channels.
@ -68,9 +71,6 @@ import sun.security.action.GetPropertyAction;
public abstract class SelectorProvider {
private static final Object lock = new Object();
private static SelectorProvider provider = null;
private static Void checkPermission() {
SecurityManager sm = System.getSecurityManager();
if (sm != null)
@ -90,45 +90,53 @@ public abstract class SelectorProvider {
this(checkPermission());
}
private static boolean loadProviderFromProperty() {
String cn = System.getProperty("java.nio.channels.spi.SelectorProvider");
if (cn == null)
return false;
try {
@SuppressWarnings("deprecation")
Object tmp = Class.forName(cn, true,
ClassLoader.getSystemClassLoader()).newInstance();
provider = (SelectorProvider)tmp;
return true;
} catch (ClassNotFoundException x) {
throw new ServiceConfigurationError(null, x);
} catch (IllegalAccessException x) {
throw new ServiceConfigurationError(null, x);
} catch (InstantiationException x) {
throw new ServiceConfigurationError(null, x);
} catch (SecurityException x) {
throw new ServiceConfigurationError(null, x);
private static class Holder {
static final SelectorProvider INSTANCE = provider();
static SelectorProvider provider() {
PrivilegedAction<SelectorProvider> pa = () -> {
SelectorProvider sp;
if ((sp = loadProviderFromProperty()) != null)
return sp;
if ((sp = loadProviderAsService()) != null)
return sp;
return sun.nio.ch.DefaultSelectorProvider.get();
};
return AccessController.doPrivileged(pa);
}
}
private static boolean loadProviderAsService() {
ServiceLoader<SelectorProvider> sl =
ServiceLoader.load(SelectorProvider.class,
ClassLoader.getSystemClassLoader());
Iterator<SelectorProvider> i = sl.iterator();
for (;;) {
private static SelectorProvider loadProviderFromProperty() {
String cn = System.getProperty("java.nio.channels.spi.SelectorProvider");
if (cn == null)
return null;
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;
Class<?> clazz = Class.forName(cn, true, ClassLoader.getSystemClassLoader());
return (SelectorProvider) clazz.getConstructor().newInstance();
} catch (ClassNotFoundException |
NoSuchMethodException |
IllegalAccessException |
InvocationTargetException |
InstantiationException |
SecurityException x) {
throw new ServiceConfigurationError(null, x);
}
}
private static SelectorProvider loadProviderAsService() {
ServiceLoader<SelectorProvider> sl =
ServiceLoader.load(SelectorProvider.class,
ClassLoader.getSystemClassLoader());
Iterator<SelectorProvider> i = sl.iterator();
for (;;) {
try {
return i.hasNext() ? i.next() : null;
} catch (ServiceConfigurationError sce) {
if (sce.getCause() instanceof SecurityException) {
// Ignore the security exception, try the next provider
continue;
}
throw sce;
}
throw sce;
}
}
}
@ -169,21 +177,7 @@ public abstract class SelectorProvider {
* @return The system-wide default selector provider
*/
public static SelectorProvider provider() {
synchronized (lock) {
if (provider != null)
return provider;
return AccessController.doPrivileged(
new PrivilegedAction<>() {
public SelectorProvider run() {
if (loadProviderFromProperty())
return provider;
if (loadProviderAsService())
return provider;
provider = sun.nio.ch.DefaultSelectorProvider.create();
return provider;
}
});
}
return Holder.INSTANCE;
}
/**
@ -317,8 +311,8 @@ public abstract class SelectorProvider {
*
* @since 1.5
*/
public Channel inheritedChannel() throws IOException {
public Channel inheritedChannel() throws IOException {
return null;
}
}
}