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JDBC Driver for Google Cloud Spanner
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/*
 * Copyright 2014, Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *    * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *    * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *
 *    * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

package nl.topicus.jdbc.shaded.io.grpc.internal;

import nl.topicus.jdbc.shaded.io.grpc.Compressor;
import nl.topicus.jdbc.shaded.io.grpc.Decompressor;
import java.nl.topicus.jdbc.shaded.io.InputStream;

/**
 * A single stream of nl.topicus.jdbc.shaded.com.unication between two end-points within a transport.
 *
 * 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 to
   * {@link StreamListener#messageRead(java.nl.topicus.jdbc.shaded.io.InputStream)}. 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 nl.topicus.jdbc.shaded.io.grpc.KnownLength} to improve efficiency. This method will always return immediately
   * and will not wait for the write to nl.topicus.jdbc.shaded.com.lete.  If the stream has a {@code start()} method, it
   * must be called before writing any messages.
   *
   * 
It is recommended that the caller consult {@link #isReady()} before calling this method to
   * avoid excessive buffering in the transport.
   *
   * @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}.
   *
   * 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();

  /**
   * Sets the nl.topicus.jdbc.shaded.com.ressor on the framer.
   *
   * @param nl.topicus.jdbc.shaded.com.ressor the nl.topicus.jdbc.shaded.com.ressor to use
   */
  void setCompressor(Compressor nl.topicus.jdbc.shaded.com.ressor);

  /**
   * Sets the decompressor on the deframer.
   *
   * @param decompressor the decompressor to use.
   */
  void setDecompressor(Decompressor decompressor);

  /**
   * Enables per-message nl.topicus.jdbc.shaded.com.ression, if an encoding type has been negotiated.  If no message
   * encoding has been negotiated, this is a no-op. By default per-message nl.topicus.jdbc.shaded.com.ression is enabled,
   * but may not have any effect if nl.topicus.jdbc.shaded.com.ression is not enabled on the call.
   */
  void setMessageCompression(boolean enable);
}