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ResponseBuilderImpl.java
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ResponseBuilderImpl.java
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package foundation.stack.datamill.http.impl;
import com.google.common.collect.LinkedListMultimap;
import com.google.common.collect.Multimap;
import foundation.stack.datamill.http.Body;
import foundation.stack.datamill.http.Response;
import foundation.stack.datamill.http.ResponseBuilder;
import foundation.stack.datamill.http.Status;
import foundation.stack.datamill.json.Json;
import foundation.stack.datamill.values.StringValue;
import rx.Emitter;
import rx.Observable;
import rx.Observer;
import rx.Subscription;
import rx.functions.Func1;
import rx.schedulers.Schedulers;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
/**
* @author Ravi Chodavarapu (rchodava@gmail.com)
*/
public class ResponseBuilderImpl implements ResponseBuilder {
private final Multimap<String, String> headers = LinkedListMultimap.create();
private Body body;
@Override
public Response badRequest() {
return new ResponseImpl(Status.BAD_REQUEST, headers, body);
}
@Override
public Response badRequest(String content) {
return new ResponseImpl(Status.BAD_REQUEST, headers, new ValueBody(new StringValue(content)));
}
@Override
public <T> ResponseBuilder header(String name, T value) {
headers.put(name, value.toString());
return this;
}
@Override
public Response internalServerError() {
return new ResponseImpl(Status.INTERNAL_SERVER_ERROR, headers, body);
}
@Override
public Response internalServerError(String content) {
return new ResponseImpl(Status.INTERNAL_SERVER_ERROR, headers, new ValueBody(new StringValue(content)));
}
@Override
public Response noContent() {
return new ResponseImpl(Status.NO_CONTENT, headers);
}
@Override
public Response notFound() {
return new ResponseImpl(Status.NOT_FOUND, headers, body);
}
@Override
public Response ok() {
return new ResponseImpl(Status.OK, headers, body);
}
@Override
public Response ok(String content) {
return new ResponseImpl(Status.OK, headers, new ValueBody(new StringValue(content)));
}
@Override
public Response ok(byte[] content) {
return new ResponseImpl(Status.OK, headers, new BytesBody(content));
}
@Override
public ResponseBuilder streamingBodyAsBufferChunks(Func1<Observer<ByteBuffer>, Observable<ByteBuffer>> bodyStreamer) {
Observable<ByteBuffer> chunkStream = Observable.fromEmitter(emitter -> {
Subscription subscription = bodyStreamer.call(new PassthroughObserver<>(emitter))
.doOnNext(buffer -> emitter.onNext(buffer))
.doOnCompleted(() -> emitter.onCompleted())
.doOnError(e -> emitter.onError(e))
.subscribeOn(Schedulers.io())
.subscribe();
emitter.setCancellation(subscription::unsubscribe);
}, Emitter.BackpressureMode.BUFFER);
this.body = new StreamedChunksBody(chunkStream, Charset.defaultCharset());
return this;
}
@Override
public ResponseBuilder streamingBody(Func1<Observer<byte[]>, Observable<byte[]>> bodyStreamer) {
return streamingBodyAsBufferChunks(body -> bodyStreamer.call(
new DelegatingObserver<byte[], ByteBuffer>(body) {
@Override
protected ByteBuffer map(byte[] bytes) {
return ByteBuffer.wrap(bytes);
}
}).map(bytes -> ByteBuffer.wrap(bytes)));
}
@Override
public ResponseBuilder streamingJson(Func1<Observer<Json>, Observable<Json>> jsonStreamer) {
return streamingBody(body ->
Observable.fromEmitter(emitter -> {
JsonStreamer streamer = new JsonStreamer(emitter);
Subscription subscription = jsonStreamer.call(streamer)
.doOnNext(json -> streamer.onNext(json))
.doOnCompleted(() -> {
emitter.onNext("]".getBytes());
emitter.onCompleted();
})
.doOnError(e -> streamer.onError(e))
.subscribeOn(Schedulers.io())
.subscribe();
emitter.setCancellation(subscription::unsubscribe);
}, Emitter.BackpressureMode.BUFFER));
}
@Override
public Response unauthorized() {
return new ResponseImpl(Status.UNAUTHORIZED, headers, body);
}
@Override
public Response unauthorized(String content) {
return new ResponseImpl(Status.UNAUTHORIZED, headers, new ValueBody(new StringValue(content)));
}
@Override
public Response forbidden() {
return new ResponseImpl(Status.FORBIDDEN, headers, body);
}
@Override
public Response forbidden(String content) {
return new ResponseImpl(Status.FORBIDDEN, headers, new ValueBody(new StringValue(content)));
}
@Override
public Response conflict(String content) {
return new ResponseImpl(Status.CONFLICT, headers, new ValueBody(new StringValue(content)));
}
private static class PassthroughObserver<T> implements Observer<T> {
private final Observer<T> target;
PassthroughObserver(Observer<T> target) {
this.target = target;
}
@Override
public void onNext(T t) {
target.onNext(t);
}
@Override
public void onError(Throwable e) {
target.onError(e);
}
@Override
public void onCompleted() {
}
}
private static abstract class DelegatingObserver<S, T> implements Observer<S> {
private final Observer<T> target;
DelegatingObserver(Observer<T> target) {
this.target = target;
}
@Override
public void onNext(S s) {
target.onNext(map(s));
}
protected abstract T map(S source);
@Override
public void onError(Throwable e) {
target.onError(e);
}
@Override
public void onCompleted() {
target.onCompleted();
}
}
private static class JsonStreamer implements Observer<Json> {
private final Observer<byte[]> body;
private boolean first = true;
JsonStreamer(Observer<byte[]> body) {
this.body = body;
}
@Override
public void onNext(Json json) {
String out = first ? "[" : ",";
first = false;
body.onNext((out + json.toString()).getBytes());
}
@Override
public void onError(Throwable e) {
body.onError(e);
}
@Override
public void onCompleted() {
}
}
}