/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.jooby.internal.netty;
import java.util.Optional;
import java.util.function.Consumer;
import org.jooby.Sse;
import com.google.common.util.concurrent.MoreExecutors;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandlerContext;
import io.netty.handler.codec.http.DefaultHttpHeaders;
import io.netty.handler.codec.http.DefaultHttpResponse;
import io.netty.handler.codec.http.HttpHeaderNames;
import io.netty.handler.codec.http.HttpResponseStatus;
import io.netty.handler.codec.http.HttpVersion;
import javaslang.concurrent.Promise;
public class NettySse extends Sse {
private static class DoneCallback implements ChannelFutureListener {
private Promise<Optional<Object>> promise;
private Consumer<Throwable> ifClose;
private Optional<Object> id;
public DoneCallback(final Promise<Optional<Object>> promise, final Optional<Object> id,
final Consumer<Throwable> ifClose) {
this.id = id;
this.promise = promise;
this.ifClose = ifClose;
}
@Override
public void operationComplete(final ChannelFuture future) throws Exception {
if (future.isSuccess()) {
promise.success(id);
} else {
Throwable cause = future.cause();
promise.failure(cause);
ifClose.accept(cause);
}
}
}
private ChannelHandlerContext ctx;
public NettySse(final ChannelHandlerContext ctx) {
this.ctx = ctx;
}
@Override
protected void closeInternal() {
ctx.close();
}
@Override
protected void handshake(final Runnable handler) throws Exception {
DefaultHttpHeaders headers = new DefaultHttpHeaders();
headers.set(HttpHeaderNames.CONNECTION, "Close");
headers.set(HttpHeaderNames.CONTENT_TYPE, "text/event-stream; charset=utf-8");
ctx.writeAndFlush(
new DefaultHttpResponse(HttpVersion.HTTP_1_1, HttpResponseStatus.OK, headers));
ctx.executor().execute(handler);
}
@Override
protected Promise<Optional<Object>> send(final Optional<Object> id, final byte[] data) {
synchronized (this) {
Promise<Optional<Object>> promise = Promise.make(MoreExecutors.newDirectExecutorService());
ctx.writeAndFlush(Unpooled.wrappedBuffer(data))
.addListener(new DoneCallback(promise, id, this::ifClose));
return promise;
}
}
}