| /* |
| * 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 io.grpc.protobuf.nano; |
| |
| import com.google.common.io.ByteStreams; |
| import com.google.protobuf.nano.CodedOutputByteBufferNano; |
| import com.google.protobuf.nano.MessageNano; |
| |
| import io.grpc.DeferredInputStream; |
| import io.grpc.KnownLength; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.OutputStream; |
| |
| import javax.annotation.Nullable; |
| |
| /** |
| * Implementation of {@link DeferredInputStream} backed by a nano proto. |
| */ |
| public class DeferredNanoProtoInputStream extends DeferredInputStream<MessageNano> |
| implements KnownLength { |
| |
| // DeferredNanoProtoInputStream is first initialized with a *message*. *partial* is initially |
| // null. |
| // Once there has been a read operation on this stream, *message* is serialized to *partial* and |
| // set to null. |
| @Nullable private MessageNano message; |
| @Nullable private ByteArrayInputStream partial; |
| |
| public DeferredNanoProtoInputStream(MessageNano message) { |
| this.message = message; |
| } |
| |
| private void toPartial() { |
| if (message != null) { |
| partial = new ByteArrayInputStream(MessageNano.toByteArray(message)); |
| message = null; |
| } |
| } |
| |
| @Override |
| public int flushTo(OutputStream target) throws IOException { |
| // TODO(simonma): flushTo is an optimization of DeferredInputStream, for the implementations |
| // that can write data directly to OutputStream, if we don't support flushTo (by not extending |
| // DeferredInputStream), the caller will use ByteStreams.copy anyway. So consider extends |
| // InputStream directly or make a real optimization here (like save the byte[] and use it for a |
| // single target.write()). |
| int written = 0; |
| toPartial(); |
| if (partial != null) { |
| written = (int) ByteStreams.copy(partial, target); |
| partial = null; |
| } |
| return written; |
| } |
| |
| @Override |
| public int read() throws IOException { |
| toPartial(); |
| if (partial != null) { |
| return partial.read(); |
| } |
| return -1; |
| } |
| |
| @Override |
| public int read(byte[] b, int off, int len) throws IOException { |
| if (message != null) { |
| int size = message.getSerializedSize(); |
| if (size == 0) { |
| message = null; |
| partial = null; |
| return -1; |
| } |
| if (len >= size) { |
| // This is the only case that is zero-copy. |
| CodedOutputByteBufferNano output = CodedOutputByteBufferNano.newInstance(b, off, size); |
| message.writeTo(output); |
| output.checkNoSpaceLeft(); |
| |
| message = null; |
| partial = null; |
| return size; |
| } |
| |
| toPartial(); |
| } |
| if (partial != null) { |
| return partial.read(b, off, len); |
| } |
| return -1; |
| } |
| |
| @Override |
| public int available() throws IOException { |
| if (message != null) { |
| return message.getSerializedSize(); |
| } else if (partial != null) { |
| return partial.available(); |
| } |
| return 0; |
| } |
| } |