Improves SelectedProtocol enum to avoid boilerplate on subclasses
NPN server providers return a String version of the negotiated protocol and the getProtocolByName method allows to easily get an instance of the SelectedProtocol enum and avoid the need for a switch statement in each subclass to match the String against the enum value.
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@ -25,24 +25,51 @@ import io.netty.handler.codec.http.HttpRequestDecoder;
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import io.netty.handler.codec.http.HttpResponseEncoder;
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import io.netty.handler.codec.http.HttpResponseEncoder;
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import io.netty.handler.ssl.SslHandler;
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import io.netty.handler.ssl.SslHandler;
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import javax.net.ssl.SSLEngine;
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import java.util.List;
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import java.util.List;
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import javax.net.ssl.SSLEngine;
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/**
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/**
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* {@link ChannelHandler} which is responsible to setup the {@link ChannelPipeline} either for
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* {@link ChannelHandler} which is responsible to setup the {@link ChannelPipeline} either for HTTP or SPDY. This offers
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* HTTP or SPDY. This offers an easy way for users to support both at the same time while not care to
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* an easy way for users to support both at the same time while not care to much about the low-level details.
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* much about the low-level details.
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*/
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*/
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public abstract class SpdyOrHttpChooser extends ByteToMessageDecoder {
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public abstract class SpdyOrHttpChooser extends ByteToMessageDecoder {
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// TODO: Replace with generic NPN handler
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// TODO: Replace with generic NPN handler
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public enum SelectedProtocol {
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public enum SelectedProtocol {
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SPDY_3,
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SPDY_3("spdy/3"),
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SPDY_3_1,
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SPDY_3_1("spdy/3.1"),
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HTTP_1_1,
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HTTP_1_1("http/1.1"),
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HTTP_1_0,
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HTTP_1_0("http/1.0"),
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UNKNOWN
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UNKNOWN("Unknown");
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private String name;
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private SelectedProtocol(String defaultName) {
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this.name = defaultName;
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}
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public String getName() {
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return this.name;
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}
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/**
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* Get an instance of this enum based on the protocol name returned by the NPN server provider
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*
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* @param name
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* the protocol name
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* @return the SelectedProtocol instance
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*/
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public static SelectedProtocol getProtocolByName(String name) {
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for (SelectedProtocol protocol : SelectedProtocol.values()) {
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if (protocol.getName().equals(name)) {
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return protocol;
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}
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}
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return UNKNOWN;
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}
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}
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}
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private final int maxSpdyContentLength;
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private final int maxSpdyContentLength;
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@ -54,8 +81,8 @@ public abstract class SpdyOrHttpChooser extends ByteToMessageDecoder {
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}
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}
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/**
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/**
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* Return the {@link SelectedProtocol} for the {@link SSLEngine}. If its not known yet implementations
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* Return the {@link SelectedProtocol} for the {@link SSLEngine}. If its not known yet implementations MUST return
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* MUST return {@link SelectedProtocol#UNKNOWN}.
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* {@link SelectedProtocol#UNKNOWN}.
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*
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*
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*/
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*/
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protected abstract SelectedProtocol getProtocol(SSLEngine engine);
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protected abstract SelectedProtocol getProtocol(SSLEngine engine);
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@ -63,14 +90,17 @@ public abstract class SpdyOrHttpChooser extends ByteToMessageDecoder {
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@Override
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@Override
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protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
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protected void decode(ChannelHandlerContext ctx, ByteBuf in, List<Object> out) throws Exception {
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if (initPipeline(ctx)) {
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if (initPipeline(ctx)) {
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// When we reached here we can remove this handler as its now clear what protocol we want to use
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// When we reached here we can remove this handler as its now clear
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// from this point on. This will also take care of forward all messages.
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// what protocol we want to use
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// from this point on. This will also take care of forward all
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// messages.
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ctx.pipeline().remove(this);
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ctx.pipeline().remove(this);
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}
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}
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}
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}
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private boolean initPipeline(ChannelHandlerContext ctx) {
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private boolean initPipeline(ChannelHandlerContext ctx) {
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// Get the SslHandler from the ChannelPipeline so we can obtain the SslEngine from it.
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// Get the SslHandler from the ChannelPipeline so we can obtain the
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// SslEngine from it.
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SslHandler handler = ctx.pipeline().get(SslHandler.class);
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SslHandler handler = ctx.pipeline().get(SslHandler.class);
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if (handler == null) {
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if (handler == null) {
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// SslHandler is needed by SPDY by design.
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// SslHandler is needed by SPDY by design.
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@ -124,19 +154,17 @@ public abstract class SpdyOrHttpChooser extends ByteToMessageDecoder {
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}
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}
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/**
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/**
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* Create the {@link ChannelHandler} that is responsible for handling the http requests
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* Create the {@link ChannelHandler} that is responsible for handling the http requests when the
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* when the {@link SelectedProtocol} was {@link SelectedProtocol#HTTP_1_0} or
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* {@link SelectedProtocol} was {@link SelectedProtocol#HTTP_1_0} or {@link SelectedProtocol#HTTP_1_1}
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* {@link SelectedProtocol#HTTP_1_1}
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*/
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*/
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protected abstract ChannelHandler createHttpRequestHandlerForHttp();
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protected abstract ChannelHandler createHttpRequestHandlerForHttp();
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/**
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/**
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* Create the {@link ChannelHandler} that is responsible for handling the http responses
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* Create the {@link ChannelHandler} that is responsible for handling the http responses when the
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* when the {@link SelectedProtocol} was {@link SelectedProtocol#SPDY_3} or
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* {@link SelectedProtocol} was {@link SelectedProtocol#SPDY_3} or {@link SelectedProtocol#SPDY_3_1}.
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* {@link SelectedProtocol#SPDY_3_1}.
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*
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*
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* By default this getMethod will just delecate to {@link #createHttpRequestHandlerForHttp()}, but
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* By default this getMethod will just delecate to {@link #createHttpRequestHandlerForHttp()}, but sub-classes may
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* sub-classes may override this to change the behaviour.
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* override this to change the behaviour.
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*/
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*/
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protected ChannelHandler createHttpRequestHandlerForSpdy() {
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protected ChannelHandler createHttpRequestHandlerForSpdy() {
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return createHttpRequestHandlerForHttp();
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return createHttpRequestHandlerForHttp();
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