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/*
* Copyright 2014 Open Networking Laboratory
*
* 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.onlab.nio;
import java.nio.ByteBuffer;
import java.nio.channels.ByteChannel;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkState;
/**
* Fixed-length message transfer buffer.
*/
public class TestMessageStream extends MessageStream<TestMessage> {
private static final String E_WRONG_LEN = "Illegal message length: ";
private static final long START_TAG = 0xfeedcafedeaddeedL;
private static final long END_TAG = 0xbeadcafedeaddeedL;
private static final int META_LENGTH = 40;
private final int length;
private boolean isStrict = true;
public TestMessageStream(int length, ByteChannel ch, IOLoop<TestMessage, ?> loop) {
super(loop, ch, 64 * 1024, 500);
checkArgument(length >= META_LENGTH, "Length must be greater than header length of 40");
this.length = length;
}
void setNonStrict() {
isStrict = false;
}
@Override
protected TestMessage read(ByteBuffer rb) {
if (rb.remaining() < length) {
return null;
}
long startTag = rb.getLong();
if (isStrict) {
checkState(startTag == START_TAG, "Incorrect message start");
}
long size = rb.getLong();
long requestorTime = rb.getLong();
long responderTime = rb.getLong();
byte[] padding = padding();
rb.get(padding);
long endTag = rb.getLong();
if (isStrict) {
checkState(endTag == END_TAG, "Incorrect message end");
}
return new TestMessage((int) size, requestorTime, responderTime, padding);
}
@Override
protected void write(TestMessage message, ByteBuffer wb) {
if (message.length() != length) {
throw new IllegalArgumentException(E_WRONG_LEN + message.length());
}
wb.putLong(START_TAG);
wb.putLong(message.length());
wb.putLong(message.requestorTime());
wb.putLong(message.responderTime());
wb.put(message.padding(), 0, length - META_LENGTH);
wb.putLong(END_TAG);
}
public byte[] padding() {
return new byte[length - META_LENGTH];
}
}
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