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/*
* Copyright 2014 The gRPC Authors
*
* 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 io.grpc.internal;
import io.grpc.Attributes;
import io.grpc.Decompressor;
import io.grpc.Metadata;
import io.grpc.Status;
import javax.annotation.Nullable;
/**
* Extension of {@link Stream} to support server-side termination semantics.
*
* <p>An implementation doesn't need to be thread-safe. All methods are expected to execute quickly.
*/
public interface ServerStream extends Stream {
/**
* Writes custom metadata as headers on the response stream sent to the client. This method may
* only be called once and cannot be called after calls to {@link Stream#writeMessage}
* or {@link #close}.
*
* @param headers to send to client.
*/
void writeHeaders(Metadata headers);
/**
* Closes the stream for both reading and writing. A status code of
* {@link io.grpc.Status.Code#OK} implies normal termination of the
* stream. Any other value implies abnormal termination.
*
* <p>Attempts to read from or write to the stream after closing
* should be ignored by implementations, and should not throw
* exceptions.
*
* @param status details of the closure
* @param trailers an additional block of metadata to pass to the client on stream closure.
*/
void close(Status status, Metadata trailers);
/**
* Tears down the stream, typically in the event of a timeout. This method may be called multiple
* times and from any thread.
*/
void cancel(Status status);
/**
* Sets the decompressor on the deframer. If the transport does not support compression, this may
* do nothing.
*
* @param decompressor the decompressor to use.
*/
void setDecompressor(Decompressor decompressor);
/**
* Attributes describing stream. This is inherited from the transport attributes, and used
* as the basis of {@link io.grpc.ServerCall#getAttributes}.
*
* @return Attributes container
*/
Attributes getAttributes();
/**
* Gets the authority this stream is addressed to.
* @return the authority string. {@code null} if not available.
*/
@Nullable
String getAuthority();
/**
* Sets the server stream listener.
*/
void setListener(ServerStreamListener serverStreamListener);
/**
* The context for recording stats and traces for this stream.
*/
StatsTraceContext statsTraceContext();
/**
* The HTTP/2 stream id, or {@code -1} if not supported.
*/
int streamId();
}
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