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EventStreamRequestHandler.java
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EventStreamRequestHandler.java
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/**
* Copyright 2016 Netflix, Inc.
*
* Licensed 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 com.netflix.hystrix.contrib.reactivesocket;
import io.reactivesocket.Payload;
import io.reactivesocket.RequestHandler;
import org.agrona.BitUtil;
import org.reactivestreams.Publisher;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import rx.Observable;
import rx.RxReactiveStreams;
/**
* An implementation of {@link RequestHandler} that provides a Hystrix Stream. Takes an 32-bit integer in the {@link Payload}
* data of a ReactiveSocket {@link io.reactivesocket.Frame} which corresponds to an id in {@link EventStreamEnum}. If
* the id is found it will begin to stream the events to the subscriber.
*/
public class EventStreamRequestHandler extends RequestHandler {
private static final Logger logger = LoggerFactory.getLogger(EventStreamRequestHandler.class);
@Override
public Publisher<Payload> handleRequestResponse(Payload payload) {
Observable<Payload> singleResponse = Observable.defer(() -> {
try {
int typeId = payload.getData().getInt(0);
EventStreamEnum eventStreamEnum = EventStreamEnum.findByTypeId(typeId);
EventStream eventStream = EventStream.getInstance(eventStreamEnum);
return eventStream.get().take(1);
} catch (Throwable t) {
logger.error(t.getMessage(), t);
return Observable.error(t);
}
});
return RxReactiveStreams.toPublisher(singleResponse);
}
@Override
public Publisher<Payload> handleRequestStream(Payload payload) {
Observable<Payload> multiResponse = Observable.defer(() -> {
try {
int typeId = payload.getData().getInt(0);
int numRequested = payload.getData().getInt(BitUtil.SIZE_OF_INT);
EventStreamEnum eventStreamEnum = EventStreamEnum.findByTypeId(typeId);
EventStream eventStream = EventStream.getInstance(eventStreamEnum);
return eventStream.get().take(numRequested);
} catch (Throwable t) {
logger.error(t.getMessage(), t);
return Observable.error(t);
}
});
return RxReactiveStreams.toPublisher(multiResponse);
}
@Override
public Publisher<Payload> handleSubscription(Payload payload) {
Observable<Payload> infiniteResponse = Observable
.defer(() -> {
try {
int typeId = payload.getData().getInt(0);
EventStreamEnum eventStreamEnum = EventStreamEnum.findByTypeId(typeId);
EventStream eventStream = EventStream.getInstance(eventStreamEnum);
return eventStream.get();
} catch (Throwable t) {
logger.error(t.getMessage(), t);
return Observable.error(t);
}
})
.onBackpressureDrop();
return RxReactiveStreams.toPublisher(infiniteResponse);
}
@Override
public Publisher<Void> handleFireAndForget(Payload payload) {
return NO_FIRE_AND_FORGET_HANDLER.apply(payload);
}
@Override
public Publisher<Payload> handleChannel(Payload initialPayload, Publisher<Payload> inputs) {
return NO_REQUEST_CHANNEL_HANDLER.apply(inputs);
}
@Override
public Publisher<Void> handleMetadataPush(Payload payload) {
return NO_METADATA_PUSH_HANDLER.apply(payload);
}
}