org.glowroot.central.util.Messages Maven / Gradle / Ivy
/*
* Copyright 2015-2018 the original author or 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 org.glowroot.central.util;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;
import javax.annotation.Nullable;
import com.google.common.collect.ImmutableList;
import com.google.protobuf.AbstractMessage;
import com.google.protobuf.Parser;
import org.glowroot.common.util.SizeLimitBypassingParser;
public class Messages {
private Messages() {}
public static ByteBuffer toByteBuffer(List messages)
throws IOException {
// TODO optimize byte copying
ByteArrayOutputStream output = new ByteArrayOutputStream();
for (AbstractMessage message : messages) {
message.writeDelimitedTo(output);
}
return ByteBuffer.wrap(output.toByteArray());
}
public static List parseDelimitedFrom(
@Nullable ByteBuffer byteBuf, Parser parser) throws IOException {
if (byteBuf == null) {
return ImmutableList.of();
}
SizeLimitBypassingParser sizeLimitBypassingParser =
new SizeLimitBypassingParser<>(parser);
List messages = new ArrayList<>();
try (InputStream input = new ByteBufferInputStream(byteBuf)) {
T message;
while ((message = sizeLimitBypassingParser.parseDelimitedFrom(input)) != null) {
messages.add(message);
}
}
return messages;
}
}