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io.netty.channel.DefaultChannelId Maven / Gradle / Ivy
/*
* Copyright 2013 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:
*
* 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 io.netty.channel;
import io.netty.buffer.ByteBufUtil;
import io.netty.util.internal.EmptyArrays;
import io.netty.util.internal.MacAddressUtil;
import io.netty.util.internal.PlatformDependent;
import io.netty.util.internal.SystemPropertyUtil;
import io.netty.util.internal.logging.InternalLogger;
import io.netty.util.internal.logging.InternalLoggerFactory;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.concurrent.atomic.AtomicInteger;
import static io.netty.util.internal.MacAddressUtil.defaultMachineId;
import static io.netty.util.internal.MacAddressUtil.parseMAC;
/**
* The default {@link ChannelId} implementation.
*/
public final class DefaultChannelId implements ChannelId {
private static final long serialVersionUID = 3884076183504074063L;
private static final InternalLogger logger = InternalLoggerFactory.getInstance(DefaultChannelId.class);
private static final byte[] MACHINE_ID;
private static final int PROCESS_ID_LEN = 4;
private static final int PROCESS_ID;
private static final int SEQUENCE_LEN = 4;
private static final int TIMESTAMP_LEN = 8;
private static final int RANDOM_LEN = 4;
private static final AtomicInteger nextSequence = new AtomicInteger();
/**
* Returns a new {@link DefaultChannelId} instance.
*/
public static DefaultChannelId newInstance() {
return new DefaultChannelId();
}
static {
int processId = -1;
String customProcessId = SystemPropertyUtil.get("io.netty.processId");
if (customProcessId != null) {
try {
processId = Integer.parseInt(customProcessId);
} catch (NumberFormatException e) {
// Malformed input.
}
if (processId < 0) {
processId = -1;
logger.warn("-Dio.netty.processId: {} (malformed)", customProcessId);
} else if (logger.isDebugEnabled()) {
logger.debug("-Dio.netty.processId: {} (user-set)", processId);
}
}
if (processId < 0) {
processId = defaultProcessId();
if (logger.isDebugEnabled()) {
logger.debug("-Dio.netty.processId: {} (auto-detected)", processId);
}
}
PROCESS_ID = processId;
byte[] machineId = null;
String customMachineId = SystemPropertyUtil.get("io.netty.machineId");
if (customMachineId != null) {
try {
machineId = parseMAC(customMachineId);
} catch (Exception e) {
logger.warn("-Dio.netty.machineId: {} (malformed)", customMachineId, e);
}
if (machineId != null) {
logger.debug("-Dio.netty.machineId: {} (user-set)", customMachineId);
}
}
if (machineId == null) {
machineId = defaultMachineId();
if (logger.isDebugEnabled()) {
logger.debug("-Dio.netty.machineId: {} (auto-detected)", MacAddressUtil.formatAddress(machineId));
}
}
MACHINE_ID = machineId;
}
private static int defaultProcessId() {
ClassLoader loader = null;
String value;
try {
loader = PlatformDependent.getClassLoader(DefaultChannelId.class);
// Invoke java.lang.management.ManagementFactory.getRuntimeMXBean().getName()
Class mgmtFactoryType = Class.forName("java.lang.management.ManagementFactory", true, loader);
Class runtimeMxBeanType = Class.forName("java.lang.management.RuntimeMXBean", true, loader);
Method getRuntimeMXBean = mgmtFactoryType.getMethod("getRuntimeMXBean", EmptyArrays.EMPTY_CLASSES);
Object bean = getRuntimeMXBean.invoke(null, EmptyArrays.EMPTY_OBJECTS);
Method getName = runtimeMxBeanType.getMethod("getName", EmptyArrays.EMPTY_CLASSES);
value = (String) getName.invoke(bean, EmptyArrays.EMPTY_OBJECTS);
} catch (Throwable t) {
logger.debug("Could not invoke ManagementFactory.getRuntimeMXBean().getName(); Android?", t);
try {
// Invoke android.os.Process.myPid()
Class processType = Class.forName("android.os.Process", true, loader);
Method myPid = processType.getMethod("myPid", EmptyArrays.EMPTY_CLASSES);
value = myPid.invoke(null, EmptyArrays.EMPTY_OBJECTS).toString();
} catch (Throwable t2) {
logger.debug("Could not invoke Process.myPid(); not Android?", t2);
value = "";
}
}
int atIndex = value.indexOf('@');
if (atIndex >= 0) {
value = value.substring(0, atIndex);
}
int pid;
try {
pid = Integer.parseInt(value);
} catch (NumberFormatException e) {
// value did not contain an integer.
pid = -1;
}
if (pid < 0) {
pid = PlatformDependent.threadLocalRandom().nextInt();
logger.warn("Failed to find the current process ID from '{}'; using a random value: {}", value, pid);
}
return pid;
}
private final byte[] data;
private final int hashCode;
private transient String shortValue;
private transient String longValue;
private DefaultChannelId() {
data = new byte[MACHINE_ID.length + PROCESS_ID_LEN + SEQUENCE_LEN + TIMESTAMP_LEN + RANDOM_LEN];
int i = 0;
// machineId
System.arraycopy(MACHINE_ID, 0, data, i, MACHINE_ID.length);
i += MACHINE_ID.length;
// processId
i = writeInt(i, PROCESS_ID);
// sequence
i = writeInt(i, nextSequence.getAndIncrement());
// timestamp (kind of)
i = writeLong(i, Long.reverse(System.nanoTime()) ^ System.currentTimeMillis());
// random
int random = PlatformDependent.threadLocalRandom().nextInt();
i = writeInt(i, random);
assert i == data.length;
hashCode = Arrays.hashCode(data);
}
private int writeInt(int i, int value) {
data[i ++] = (byte) (value >>> 24);
data[i ++] = (byte) (value >>> 16);
data[i ++] = (byte) (value >>> 8);
data[i ++] = (byte) value;
return i;
}
private int writeLong(int i, long value) {
data[i ++] = (byte) (value >>> 56);
data[i ++] = (byte) (value >>> 48);
data[i ++] = (byte) (value >>> 40);
data[i ++] = (byte) (value >>> 32);
data[i ++] = (byte) (value >>> 24);
data[i ++] = (byte) (value >>> 16);
data[i ++] = (byte) (value >>> 8);
data[i ++] = (byte) value;
return i;
}
@Override
public String asShortText() {
String shortValue = this.shortValue;
if (shortValue == null) {
this.shortValue = shortValue = ByteBufUtil.hexDump(data, data.length - RANDOM_LEN, RANDOM_LEN);
}
return shortValue;
}
@Override
public String asLongText() {
String longValue = this.longValue;
if (longValue == null) {
this.longValue = longValue = newLongValue();
}
return longValue;
}
private String newLongValue() {
StringBuilder buf = new StringBuilder(2 * data.length + 5);
int i = 0;
i = appendHexDumpField(buf, i, MACHINE_ID.length);
i = appendHexDumpField(buf, i, PROCESS_ID_LEN);
i = appendHexDumpField(buf, i, SEQUENCE_LEN);
i = appendHexDumpField(buf, i, TIMESTAMP_LEN);
i = appendHexDumpField(buf, i, RANDOM_LEN);
assert i == data.length;
return buf.substring(0, buf.length() - 1);
}
private int appendHexDumpField(StringBuilder buf, int i, int length) {
buf.append(ByteBufUtil.hexDump(data, i, length));
buf.append('-');
i += length;
return i;
}
@Override
public int hashCode() {
return hashCode;
}
@Override
public int compareTo(final ChannelId o) {
if (this == o) {
// short circuit
return 0;
}
if (o instanceof DefaultChannelId) {
// lexicographic comparison
final byte[] otherData = ((DefaultChannelId) o).data;
int len1 = data.length;
int len2 = otherData.length;
int len = Math.min(len1, len2);
for (int k = 0; k < len; k++) {
byte x = data[k];
byte y = otherData[k];
if (x != y) {
// treat these as unsigned bytes for comparison
return (x & 0xff) - (y & 0xff);
}
}
return len1 - len2;
}
return asLongText().compareTo(o.asLongText());
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof DefaultChannelId)) {
return false;
}
DefaultChannelId other = (DefaultChannelId) obj;
return hashCode == other.hashCode && Arrays.equals(data, other.data);
}
@Override
public String toString() {
return asShortText();
}
}
