e404690574
Motivation: A `DefaultChannelId` has final `hashCode` field calculated in the constructor. We can use it in `equals` to the fast return for different objects. Modifications: Use `hashCode` field in `DefaultChannelId.equals()`. Result: Fast `equals` on negative scenarios.
292 lines
9.7 KiB
Java
292 lines
9.7 KiB
Java
/*
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* Copyright 2013 The Netty Project
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*
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* The Netty Project licenses this file to you under the Apache License,
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* version 2.0 (the "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at:
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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* License for the specific language governing permissions and limitations
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* under the License.
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*/
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package io.netty.channel;
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import io.netty.buffer.ByteBufUtil;
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import io.netty.util.internal.EmptyArrays;
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import io.netty.util.internal.MacAddressUtil;
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import io.netty.util.internal.PlatformDependent;
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import io.netty.util.internal.SystemPropertyUtil;
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import io.netty.util.internal.logging.InternalLogger;
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import io.netty.util.internal.logging.InternalLoggerFactory;
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import java.lang.reflect.Method;
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import java.util.Arrays;
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import java.util.concurrent.atomic.AtomicInteger;
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import static io.netty.util.internal.MacAddressUtil.defaultMachineId;
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import static io.netty.util.internal.MacAddressUtil.parseMAC;
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/**
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* The default {@link ChannelId} implementation.
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*/
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public final class DefaultChannelId implements ChannelId {
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private static final long serialVersionUID = 3884076183504074063L;
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private static final InternalLogger logger = InternalLoggerFactory.getInstance(DefaultChannelId.class);
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private static final byte[] MACHINE_ID;
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private static final int PROCESS_ID_LEN = 4;
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private static final int PROCESS_ID;
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private static final int SEQUENCE_LEN = 4;
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private static final int TIMESTAMP_LEN = 8;
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private static final int RANDOM_LEN = 4;
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private static final AtomicInteger nextSequence = new AtomicInteger();
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/**
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* Returns a new {@link DefaultChannelId} instance.
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*/
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public static DefaultChannelId newInstance() {
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return new DefaultChannelId();
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}
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static {
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int processId = -1;
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String customProcessId = SystemPropertyUtil.get("io.netty.processId");
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if (customProcessId != null) {
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try {
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processId = Integer.parseInt(customProcessId);
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} catch (NumberFormatException e) {
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// Malformed input.
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}
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if (processId < 0) {
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processId = -1;
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logger.warn("-Dio.netty.processId: {} (malformed)", customProcessId);
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} else if (logger.isDebugEnabled()) {
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logger.debug("-Dio.netty.processId: {} (user-set)", processId);
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}
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}
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if (processId < 0) {
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processId = defaultProcessId();
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if (logger.isDebugEnabled()) {
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logger.debug("-Dio.netty.processId: {} (auto-detected)", processId);
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}
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}
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PROCESS_ID = processId;
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byte[] machineId = null;
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String customMachineId = SystemPropertyUtil.get("io.netty.machineId");
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if (customMachineId != null) {
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try {
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machineId = parseMAC(customMachineId);
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} catch (Exception e) {
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logger.warn("-Dio.netty.machineId: {} (malformed)", customMachineId, e);
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}
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if (machineId != null) {
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logger.debug("-Dio.netty.machineId: {} (user-set)", customMachineId);
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}
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}
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if (machineId == null) {
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machineId = defaultMachineId();
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if (logger.isDebugEnabled()) {
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logger.debug("-Dio.netty.machineId: {} (auto-detected)", MacAddressUtil.formatAddress(machineId));
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}
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}
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MACHINE_ID = machineId;
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}
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private static int defaultProcessId() {
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ClassLoader loader = null;
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String value;
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try {
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loader = PlatformDependent.getClassLoader(DefaultChannelId.class);
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// Invoke java.lang.management.ManagementFactory.getRuntimeMXBean().getName()
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Class<?> mgmtFactoryType = Class.forName("java.lang.management.ManagementFactory", true, loader);
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Class<?> runtimeMxBeanType = Class.forName("java.lang.management.RuntimeMXBean", true, loader);
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Method getRuntimeMXBean = mgmtFactoryType.getMethod("getRuntimeMXBean", EmptyArrays.EMPTY_CLASSES);
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Object bean = getRuntimeMXBean.invoke(null, EmptyArrays.EMPTY_OBJECTS);
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Method getName = runtimeMxBeanType.getMethod("getName", EmptyArrays.EMPTY_CLASSES);
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value = (String) getName.invoke(bean, EmptyArrays.EMPTY_OBJECTS);
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} catch (Throwable t) {
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logger.debug("Could not invoke ManagementFactory.getRuntimeMXBean().getName(); Android?", t);
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try {
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// Invoke android.os.Process.myPid()
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Class<?> processType = Class.forName("android.os.Process", true, loader);
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Method myPid = processType.getMethod("myPid", EmptyArrays.EMPTY_CLASSES);
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value = myPid.invoke(null, EmptyArrays.EMPTY_OBJECTS).toString();
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} catch (Throwable t2) {
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logger.debug("Could not invoke Process.myPid(); not Android?", t2);
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value = "";
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}
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}
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int atIndex = value.indexOf('@');
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if (atIndex >= 0) {
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value = value.substring(0, atIndex);
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}
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int pid;
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try {
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pid = Integer.parseInt(value);
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} catch (NumberFormatException e) {
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// value did not contain an integer.
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pid = -1;
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}
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if (pid < 0) {
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pid = PlatformDependent.threadLocalRandom().nextInt();
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logger.warn("Failed to find the current process ID from '{}'; using a random value: {}", value, pid);
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}
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return pid;
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}
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private final byte[] data;
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private final int hashCode;
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private transient String shortValue;
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private transient String longValue;
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private DefaultChannelId() {
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data = new byte[MACHINE_ID.length + PROCESS_ID_LEN + SEQUENCE_LEN + TIMESTAMP_LEN + RANDOM_LEN];
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int i = 0;
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// machineId
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System.arraycopy(MACHINE_ID, 0, data, i, MACHINE_ID.length);
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i += MACHINE_ID.length;
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// processId
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i = writeInt(i, PROCESS_ID);
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// sequence
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i = writeInt(i, nextSequence.getAndIncrement());
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// timestamp (kind of)
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i = writeLong(i, Long.reverse(System.nanoTime()) ^ System.currentTimeMillis());
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// random
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int random = PlatformDependent.threadLocalRandom().nextInt();
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i = writeInt(i, random);
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assert i == data.length;
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hashCode = Arrays.hashCode(data);
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}
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private int writeInt(int i, int value) {
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data[i ++] = (byte) (value >>> 24);
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data[i ++] = (byte) (value >>> 16);
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data[i ++] = (byte) (value >>> 8);
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data[i ++] = (byte) value;
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return i;
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}
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private int writeLong(int i, long value) {
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data[i ++] = (byte) (value >>> 56);
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data[i ++] = (byte) (value >>> 48);
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data[i ++] = (byte) (value >>> 40);
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data[i ++] = (byte) (value >>> 32);
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data[i ++] = (byte) (value >>> 24);
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data[i ++] = (byte) (value >>> 16);
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data[i ++] = (byte) (value >>> 8);
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data[i ++] = (byte) value;
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return i;
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}
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@Override
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public String asShortText() {
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String shortValue = this.shortValue;
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if (shortValue == null) {
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this.shortValue = shortValue = ByteBufUtil.hexDump(data, data.length - RANDOM_LEN, RANDOM_LEN);
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}
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return shortValue;
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}
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@Override
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public String asLongText() {
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String longValue = this.longValue;
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if (longValue == null) {
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this.longValue = longValue = newLongValue();
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}
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return longValue;
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}
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private String newLongValue() {
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StringBuilder buf = new StringBuilder(2 * data.length + 5);
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int i = 0;
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i = appendHexDumpField(buf, i, MACHINE_ID.length);
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i = appendHexDumpField(buf, i, PROCESS_ID_LEN);
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i = appendHexDumpField(buf, i, SEQUENCE_LEN);
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i = appendHexDumpField(buf, i, TIMESTAMP_LEN);
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i = appendHexDumpField(buf, i, RANDOM_LEN);
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assert i == data.length;
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return buf.substring(0, buf.length() - 1);
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}
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private int appendHexDumpField(StringBuilder buf, int i, int length) {
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buf.append(ByteBufUtil.hexDump(data, i, length));
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buf.append('-');
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i += length;
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return i;
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}
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@Override
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public int hashCode() {
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return hashCode;
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}
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@Override
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public int compareTo(final ChannelId o) {
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if (this == o) {
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// short circuit
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return 0;
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}
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if (o instanceof DefaultChannelId) {
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// lexicographic comparison
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final byte[] otherData = ((DefaultChannelId) o).data;
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int len1 = data.length;
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int len2 = otherData.length;
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int len = Math.min(len1, len2);
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for (int k = 0; k < len; k++) {
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byte x = data[k];
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byte y = otherData[k];
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if (x != y) {
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// treat these as unsigned bytes for comparison
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return (x & 0xff) - (y & 0xff);
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}
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}
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return len1 - len2;
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}
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return asLongText().compareTo(o.asLongText());
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}
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@Override
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public boolean equals(Object obj) {
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if (this == obj) {
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return true;
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}
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if (!(obj instanceof DefaultChannelId)) {
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return false;
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}
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DefaultChannelId other = (DefaultChannelId) obj;
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return hashCode == other.hashCode && Arrays.equals(data, other.data);
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}
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@Override
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public String toString() {
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return asShortText();
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}
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}
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