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Easy Redis Java client and Real-Time Data Platform. Valkey compatible. Sync/Async/RxJava3/Reactive API. Client side caching. Over 50 Redis based Java objects and services: JCache API, Apache Tomcat, Hibernate, Spring, Set, Multimap, SortedSet, Map, List, Queue, Deque, Semaphore, Lock, AtomicLong, Map Reduce, Bloom filter, Scheduler, RPC
/*
* Copyright 2020 The Netty Project
*
* The Netty Project licenses this file to you 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:
*
* https://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.netty.handler.pcap;
import io.netty.buffer.ByteBuf;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.io.Closeable;
import java.io.IOException;
import java.io.OutputStream;
final class PcapWriter implements Closeable {
/**
* Logger
*/
private static final InternalLogger logger = InternalLoggerFactory.getInstance(PcapWriter.class);
private final PcapWriteHandler pcapWriteHandler;
/**
* Reference declared so that we can use this as mutex in clean way.
*/
private final OutputStream outputStream;
/**
* This uses {@link OutputStream} for writing Pcap data.
*
* @throws IOException If {@link OutputStream#write(byte[])} throws an exception
*/
PcapWriter(PcapWriteHandler pcapWriteHandler) throws IOException {
this.pcapWriteHandler = pcapWriteHandler;
outputStream = pcapWriteHandler.outputStream();
// If OutputStream is not shared then we have to write Global Header.
if (!pcapWriteHandler.sharedOutputStream()) {
PcapHeaders.writeGlobalHeader(pcapWriteHandler.outputStream());
}
}
/**
* Write Packet in Pcap OutputStream.
*
* @param packetHeaderBuf Packer Header {@link ByteBuf}
* @param packet Packet
* @throws IOException If {@link OutputStream#write(byte[])} throws an exception
*/
void writePacket(ByteBuf packetHeaderBuf, ByteBuf packet) throws IOException {
if (pcapWriteHandler.state() == State.CLOSED) {
logger.debug("Pcap Write attempted on closed PcapWriter");
}
long timestamp = System.currentTimeMillis();
PcapHeaders.writePacketHeader(
packetHeaderBuf,
(int) (timestamp / 1000L),
(int) (timestamp % 1000L * 1000L),
packet.readableBytes(),
packet.readableBytes()
);
if (pcapWriteHandler.sharedOutputStream()) {
synchronized (outputStream) {
packetHeaderBuf.readBytes(outputStream, packetHeaderBuf.readableBytes());
packet.readBytes(outputStream, packet.readableBytes());
}
} else {
packetHeaderBuf.readBytes(outputStream, packetHeaderBuf.readableBytes());
packet.readBytes(outputStream, packet.readableBytes());
}
}
@Override
public String toString() {
return "PcapWriter{" +
"outputStream=" + outputStream +
'}';
}
@Override
public void close() throws IOException {
if (pcapWriteHandler.state() == State.CLOSED) {
logger.debug("PcapWriter is already closed");
} else {
if (pcapWriteHandler.sharedOutputStream()) {
synchronized (outputStream) {
outputStream.flush();
}
} else {
outputStream.flush();
outputStream.close();
}
pcapWriteHandler.markClosed();
logger.debug("PcapWriter is now closed");
}
}
}
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