| /* |
| * 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.Compressor; |
| import java.io.InputStream; |
| |
| /** |
| * A single stream of communication between two end-points within a transport. |
| * |
| * <p>An implementation doesn't need to be thread-safe. All methods are expected to execute quickly. |
| */ |
| public interface Stream { |
| /** |
| * Requests up to the given number of messages from the call to be delivered via |
| * {@link StreamListener#messagesAvailable(StreamListener.MessageProducer)}. No additional |
| * messages will be delivered. If the stream has a {@code start()} method, it must be called |
| * before requesting messages. |
| * |
| * @param numMessages the requested number of messages to be delivered to the listener. |
| */ |
| void request(int numMessages); |
| |
| /** |
| * Writes a message payload to the remote end-point. The bytes from the stream are immediately |
| * read by the Transport. Where possible callers should use streams that are |
| * {@link io.grpc.KnownLength} to improve efficiency. This method will always return immediately |
| * and will not wait for the write to complete. If the stream has a {@code start()} method, it |
| * must be called before writing any messages. |
| * |
| * <p>It is recommended that the caller consult {@link #isReady()} before calling this method to |
| * avoid excessive buffering in the transport. |
| * |
| * <p>This method takes ownership of the InputStream, and implementations are responsible for |
| * calling {@link InputStream#close}. |
| * |
| * @param message stream containing the serialized message to be sent |
| */ |
| void writeMessage(InputStream message); |
| |
| /** |
| * Flushes any internally buffered messages to the remote end-point. |
| */ |
| void flush(); |
| |
| /** |
| * If {@code true}, indicates that the transport is capable of sending additional messages without |
| * requiring excessive buffering internally. Otherwise, {@link StreamListener#onReady()} will be |
| * called when it turns {@code true}. |
| * |
| * <p>This is just a suggestion and the application is free to ignore it, however doing so may |
| * result in excessive buffering within the transport. |
| */ |
| boolean isReady(); |
| |
| /** |
| * Provides a hint that directExecutor is being used by the listener for callbacks to the |
| * application. No action is required. There is no requirement that this method actually matches |
| * the executor used. |
| */ |
| void optimizeForDirectExecutor(); |
| |
| /** |
| * Sets the compressor on the framer. |
| * |
| * @param compressor the compressor to use |
| */ |
| void setCompressor(Compressor compressor); |
| |
| /** |
| * Enables per-message compression, if an encoding type has been negotiated. If no message |
| * encoding has been negotiated, this is a no-op. By default per-message compression is enabled, |
| * but may not have any effect if compression is not enabled on the call. |
| */ |
| void setMessageCompression(boolean enable); |
| } |