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Add ApplicationProtocolConfig.DISABLED

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Motivation:

When ALPN/NPN is disabled, a user has to instantiate a new
ApplicationProtocolConfig with meaningless parameters.

Modifications:

- Add ApplicationProtocolConfig.DISABLED, the singleton instance
- Reject the constructor calls with Protocol.NONE, which doesn't make
  much sense because a user should use DISABLED instead.

Result:

More user-friendly API when ALPN/NPN is not needed by a user.
This commit is contained in:
Trustin Lee 2014-10-31 14:09:46 +09:00
parent 483fc48b31
commit afe4833e4e
1 changed files with 25 additions and 5 deletions
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30
handler/src/main/java/io/netty/handler/ssl/ApplicationProtocolConfig.java
View File

@ -15,18 +15,23 @@
*/
package io.netty.handler.ssl;
import static io.netty.handler.ssl.ApplicationProtocolUtil.toList;
import static io.netty.util.internal.ObjectUtil.checkNotNull;
import javax.net.ssl.SSLEngine;
import java.util.Collections;
import java.util.List;
import javax.net.ssl.SSLEngine;
import static io.netty.handler.ssl.ApplicationProtocolUtil.*;
import static io.netty.util.internal.ObjectUtil.*;
/**
* Provides an {@link SSLEngine} agnostic way to configure a {@link ApplicationProtocolNegotiator}.
*/
public final class ApplicationProtocolConfig {
/**
* The configuration that disables application protocol negotiation.
*/
public static final ApplicationProtocolConfig DISABLED = new ApplicationProtocolConfig();
private final List<String> supportedProtocols;
private final Protocol protocol;
private final SelectorFailureBehavior selectorBehavior;
@ -63,12 +68,27 @@ public final class ApplicationProtocolConfig {
* @param selectedBehavior How the peer being notified of the selected protocol should behave.
* @param supportedProtocols The order of iteration determines the preference of support for protocols.
*/
private ApplicationProtocolConfig(Protocol protocol, SelectorFailureBehavior selectorBehavior,
private ApplicationProtocolConfig(
Protocol protocol, SelectorFailureBehavior selectorBehavior,
SelectedListenerFailureBehavior selectedBehavior, List<String> supportedProtocols) {
this.supportedProtocols = Collections.unmodifiableList(checkNotNull(supportedProtocols, "supportedProtocols"));
this.protocol = checkNotNull(protocol, "protocol");
this.selectorBehavior = checkNotNull(selectorBehavior, "selectorBehavior");
this.selectedBehavior = checkNotNull(selectedBehavior, "selectedBehavior");
if (protocol == Protocol.NONE) {
throw new IllegalArgumentException("protocol (" + Protocol.NONE + ") must not be " + Protocol.NONE + '.');
}
}
/**
* A special constructor that is used to instantiate {@link #DISABLED}.
*/
private ApplicationProtocolConfig() {
supportedProtocols = Collections.emptyList();
protocol = Protocol.NONE;
selectorBehavior = SelectorFailureBehavior.CHOOSE_MY_LAST_PROTOCOL;
selectedBehavior = SelectedListenerFailureBehavior.ACCEPT;
}
/**