feat: 添加新发号器，新发号器由 deltaSecond + dataCenterId + workerId + sequence 组成，其中...

feat: 添加新发号器，新发号器由 deltaSecond + dataCenterId + workerId + sequence 组成，其中 dataCenterId + workerId + sequence 必须小于 64 bit，发号时间不限制

commons-spring/src/main/java/cn/quantgroup/tech/util/id/BitsAllocator.java

+/*
+ * Copyright (c) 2017 Baidu, Inc. All Rights Reserve.
+ *
+ * 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 cn.quantgroup.tech.util.id;
+
+import org.apache.commons.lang3.builder.ToStringBuilder;
+import org.apache.commons.lang3.builder.ToStringStyle;
+import org.springframework.util.Assert;
+
+import java.math.BigInteger;
+
+/**
+ * Allocate 64 bits for the UID(long)<br>
+ * sign (fixed 1bit) -> deltaSecond -> workerId -> sequence(within the same second)
+ *
+ * @author yutianbao
+ */
+public class BitsAllocator {
+    /**
+     * Total 64 bits
+     * dataCenterIdBits + workerIdBits + sequenceBits
+     */
+    public static final int TOTAL_BITS = 1 << 6;
+
+    private final int timestampBits;
+    private final int dataCenterIdBits;
+    private final int workerIdBits;
+    private final int sequenceBits;
+    /**
+     * Max value for dataCenterId & workerId & sequence
+     */
+    private final long maxDeltaSeconds;
+    private final long maxDataCenterId;
+    private final long maxWorkerId;
+    private final long maxSequence;
+    /**
+     * Shift for dataCenterId & workerId & sequence
+     */
+    private final int timestampShift;
+    private final int dataCenterIdShift;
+    private final int workerIdShift;
+
+    /**
+     * Constructor with timestampBits, workerIdBits, sequenceBits<br>
+     * The highest bit used for sign, so <code>63</code> bits for timestampBits, workerIdBits, sequenceBits
+     */
+    public BitsAllocator(int timestampBits, int dataCenterIdBits, int workerIdBits, int sequenceBits) {
+        // make sure allocated 64 bits
+        int allocateTotalBits = dataCenterIdBits + workerIdBits + sequenceBits;
+        Assert.isTrue(allocateTotalBits + 1 < TOTAL_BITS, "allocate greater than 64 bits");
+
+        // initialize bits
+        this.timestampBits = timestampBits;
+        this.dataCenterIdBits = dataCenterIdBits;
+        this.workerIdBits = workerIdBits;
+        this.sequenceBits = sequenceBits;
+
+        // initialize max value
+        this.maxDeltaSeconds = ~(-1L << timestampBits);
+        this.maxDataCenterId = ~(-1L << dataCenterIdBits);
+        this.maxWorkerId = ~(-1L << workerIdBits);
+        this.maxSequence = ~(-1L << sequenceBits);
+
+        // initialize shift
+        this.timestampShift = dataCenterIdBits + workerIdBits + sequenceBits;
+        this.dataCenterIdShift = workerIdBits + sequenceBits;
+        this.workerIdShift = sequenceBits;
+    }
+
+    /**
+     * Allocate bits for UID according to delta seconds & workerId & sequence<br>
+     * <b>Note that: </b>The highest bit will always be 0 for sign
+     *
+     * @param deltaSeconds
+     * @param workerId
+     * @param sequence
+     * @return
+     */
+    public long allocate(long deltaSeconds, long dataCenterId, long workerId, long sequence) {
+        return (deltaSeconds << timestampShift) | (dataCenterId << dataCenterIdShift) | (workerId << workerIdShift) | sequence;
+    }
+
+    public BigInteger allocateBigInteger(long deltaSeconds, long dataCenterId, long workerId, long sequence) {
+        return BigInteger.ZERO.or(BigInteger.valueOf(deltaSeconds).shiftLeft(timestampShift))
+                .or(BigInteger.valueOf(dataCenterId).shiftLeft(dataCenterIdShift))
+                .or(BigInteger.valueOf(workerId).shiftLeft(workerIdShift))
+                .or(BigInteger.valueOf(sequence));
+    }
+
+    public int getTimestampBits() {
+        return timestampBits;
+    }
+
+    public int getDataCenterIdBits() {
+        return dataCenterIdBits;
+    }
+
+    public int getWorkerIdBits() {
+        return workerIdBits;
+    }
+
+    public int getSequenceBits() {
+        return sequenceBits;
+    }
+
+    public long getMaxDeltaSeconds() {
+        return maxDeltaSeconds;
+    }
+
+    public long getMaxDataCenterId() {
+        return maxDataCenterId;
+    }
+
+    public long getMaxWorkerId() {
+        return maxWorkerId;
+    }
+
+    public long getMaxSequence() {
+        return maxSequence;
+    }
+
+    public int getTimestampShift() {
+        return timestampShift;
+    }
+
+    public int getWorkerIdShift() {
+        return workerIdShift;
+    }
+
+    @Override
+    public String toString() {
+        return ToStringBuilder.reflectionToString(this, ToStringStyle.SHORT_PREFIX_STYLE);
+    }
+
+}
\ No newline at end of file

commons-spring/src/main/java/cn/quantgroup/tech/util/id/DefaultUidGenerator.java

+package cn.quantgroup.tech.util.id;
+
+import org.apache.commons.lang3.StringUtils;
+import org.apache.commons.lang3.time.DateFormatUtils;
+import org.apache.commons.lang3.time.DateUtils;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.InitializingBean;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+import org.springframework.util.Assert;
+
+import java.text.ParseException;
+import java.util.Date;
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Represents an implementation of {@link UidGenerator}
+ * <p>
+ * The unique id has 64bits (long), default allocated as blow:<br>
+ * <li>sign: The highest bit is 0
+ * <li>delta seconds: The next 28 bits, represents delta seconds since a customer epoch(2016-05-20 00:00:00.000).
+ * Supports about 8.7 years until to 2024-11-20 21:24:16
+ * <li>worker id: The next 22 bits, represents the worker's id which assigns based on database, max id is about 420W
+ * <li>sequence: The next 13 bits, represents a sequence within the same second, max for 8192/s<br><br>
+ * <p>
+ * The {@link DefaultUidGenerator#parseUID(long)} is a tool method to parse the bits
+ * <p>
+ * <pre>{@code
+ * +------+----------------------+----------------+-----------+
+ * | sign |     delta seconds    | worker node id | sequence  |
+ * +------+----------------------+----------------+-----------+
+ *   1bit          28bits              22bits         13bits
+ * }</pre>
+ * <p>
+ * You can also specified the bits by Spring property setting.
+ * <li>timeBits: default as 28
+ * <li>workerBits: default as 22
+ * <li>seqBits: default as 13
+ * <li>epochStr: Epoch date string format 'yyyy-MM-dd'. Default as '2016-05-20'<p>
+ * <p>
+ * <b>Note that:</b> The total bits must be 64 -1
+ *
+ * @author yutianbao
+ */
+@Component
+public class DefaultUidGenerator implements UidGenerator, InitializingBean {
+    public static final String DATETIME_PATTERN = "yyyy-MM-dd HH:mm:ss";
+    public static final String DAY_PATTERN = "yyyy-MM-dd";
+    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultUidGenerator.class);
+    /**
+     * Bits allocate
+     */
+    @Value("${uid.timeBits:28}")
+    protected int timeBits;
+    @Value("${uid.dataCenterIdBits:9}")
+    protected int dataCenterIdBits;
+    @Value("${uid.workerBits:13}")
+    protected int workerBits;
+    @Value("${uid.seqBits:23}")
+    protected int seqBits;
+
+    /**
+     * Customer epoch, unit as second. For example 2018-03-01 (ms: 1463673600000)
+     */
+    protected String epochStr;
+    protected long epochSeconds;
+
+    /**
+     * Stable fields after spring bean initializing
+     */
+    protected BitsAllocator bitsAllocator;
+    protected long workerId;
+    protected long dataCenterId;
+
+    /**
+     * Volatile fields caused by nextId()
+     */
+    protected long sequence = 0L;
+    protected long lastSecond = -1L;
+
+    /**
+     * Spring property
+     */
+    @Autowired
+    protected DisposableWorkerIdAssigner workerIdAssigner;
+
+    @Override
+    public void afterPropertiesSet() throws Exception {
+        // initialize bits allocator
+        bitsAllocator = new BitsAllocator(timeBits, dataCenterIdBits, workerBits, seqBits);
+
+        // initialize worker id
+        workerId = workerIdAssigner.assignWorkerId(dataCenterId, bitsAllocator);
+        Assert.isTrue(workerId < bitsAllocator.getMaxWorkerId(), "workerId is too big");
+        Assert.isTrue(workerId < bitsAllocator.getMaxDataCenterId(), "dataCenterId is too big");
+        LOGGER.info("Initialized bits dataCenterBits:{}, workerBits:{}, seqBits:{}", dataCenterIdBits, workerBits, seqBits);
+    }
+
+    @Override
+    public String getUID(String preFix) throws UidGenerateException {
+        try {
+            return nextId(preFix);
+        } catch (Exception e) {
+            LOGGER.error("Generate unique id exception. ", e);
+            throw new UidGenerateException(e);
+        }
+    }
+
+    // TODO: 2018/3/5 反序列化 uid
+    @Override
+    public String parseUID(long uid) {
+        int totalBits = Long.toBinaryString(uid).length();
+        long timestampBits = bitsAllocator.getTimestampBits();
+        long dataCenterIdBits = bitsAllocator.getDataCenterIdBits();
+        long workerIdBits = bitsAllocator.getWorkerIdBits();
+        long sequenceBits = bitsAllocator.getSequenceBits();
+
+        if (totalBits < 64) {
+
+        }
+        // parse UID
+        long sequence = (uid << (totalBits - sequenceBits)) >>> (totalBits - sequenceBits);
+        long workerId = (uid << (timestampBits + 1)) >>> (totalBits - workerIdBits);
+        long deltaSeconds = uid >>> (dataCenterIdBits + workerIdBits + sequenceBits);
+
+        Date thatTime = new Date(TimeUnit.SECONDS.toMillis(epochSeconds + deltaSeconds));
+
+        String thatTimeStr = DateFormatUtils.format(thatTime, DATETIME_PATTERN);
+
+        // format as string
+        return String.format("{\"UID\":\"%d\",\"timestamp\":\"%s\",\"workerId\":\"%d\",\"sequence\":\"%d\"}",
+                uid, thatTimeStr, workerId, sequence);
+    }
+
+    /**
+     * Get UID
+     *
+     * @return UID
+     * @throws UidGenerateException in the case: Clock moved backwards; Exceeds the max timestamp
+     */
+    protected synchronized String nextId(String preFix) {
+        long currentSecond = getCurrentSecond();
+
+        // Clock moved backwards, wait for newest time
+        if (currentSecond < lastSecond) {
+            getNextSecond(lastSecond);
+        }
+
+        // At the same second, increase sequence
+        if (currentSecond == lastSecond) {
+            sequence = (sequence + 1) & bitsAllocator.getMaxSequence();
+            // Exceed the max sequence, we wait the next second to generate uid
+            if (sequence == 0) {
+                currentSecond = getNextSecond(lastSecond);
+            }
+            // At the different second, sequence restart from zero
+        } else {
+            sequence = 0L;
+        }
+
+        lastSecond = currentSecond;
+
+        // 当前时间小于设定的最大时间，即总位数在 64 位以下，用 long 生成数字
+        if (currentSecond - epochSeconds <= bitsAllocator.getMaxDeltaSeconds()) {
+            return preFix + bitsAllocator.allocate(currentSecond - epochSeconds, dataCenterId, workerId, sequence);
+        }
+        return preFix + bitsAllocator.allocateBigInteger(currentSecond - epochSeconds, dataCenterId, workerId, sequence);
+    }
+
+    /**
+     * Get next millisecond
+     */
+    private long getNextSecond(long lastTimestamp) {
+        long timestamp = getCurrentSecond();
+        while (timestamp <= lastTimestamp) {
+            timestamp = getCurrentSecond();
+        }
+
+        return timestamp;
+    }
+
+    /**
+     * Get current second
+     */
+    private long getCurrentSecond() {
+        return TimeUnit.MILLISECONDS.toSeconds(System.currentTimeMillis());
+    }
+
+
+    public void setTimeBits(int timeBits) {
+        if (timeBits > 0) {
+            this.timeBits = timeBits;
+        }
+    }
+
+    public void setWorkerBits(int workerBits) {
+        if (workerBits > 0) {
+            this.workerBits = workerBits;
+        }
+    }
+
+    public void setSeqBits(int seqBits) {
+        if (seqBits > 0) {
+            this.seqBits = seqBits;
+        }
+    }
+
+    @Value("${uid.epochStr:2018-03-01}")
+    public void setEpochStr(String epochStr) {
+        if (StringUtils.isNotBlank(epochStr)) {
+            this.epochStr = epochStr;
+            try {
+                this.epochSeconds = TimeUnit.MILLISECONDS.toSeconds(DateUtils.parseDate(epochStr, new String[]{DAY_PATTERN}).getTime());
+            } catch (ParseException e) {
+                e.printStackTrace();
+            }
+        }
+    }
+}

commons-spring/src/main/java/cn/quantgroup/tech/util/id/DisposableWorkerIdAssigner.java

+/*
+ * Copyright (c) 2017 Baidu, Inc. All Rights Reserve.
+ *
+ * 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 cn.quantgroup.tech.util.id;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.data.redis.core.StringRedisTemplate;
+import org.springframework.stereotype.Component;
+
+@Component
+public class DisposableWorkerIdAssigner {
+    private static final Logger LOGGER = LoggerFactory.getLogger(DisposableWorkerIdAssigner.class);
+    private static final String REDIS_WORK_ID_KEY = "GLOBAL:WORK:ID:";
+
+    @Autowired
+    private StringRedisTemplate redisTemplate;
+
+    /**
+     * Assign worker id base on database.<p>
+     * If there is host name & port in the environment, we considered that the node runs in Docker container<br>
+     * Otherwise, the node runs on an actual machine.
+     *
+     * @param dataCenterId
+     * @param bitsAllocator
+     * @return assigned worker id
+     */
+    public long assignWorkerId(long dataCenterId, BitsAllocator bitsAllocator) {
+        return redisTemplate.opsForValue().increment(REDIS_WORK_ID_KEY + dataCenterId, 1) % bitsAllocator.getMaxWorkerId();
+    }
+
+
+}

commons-spring/src/main/java/cn/quantgroup/tech/util/id/UidGenerateException.java

+/*
+ * Copyright (c) 2017 Baidu, Inc. All Rights Reserve.
+ *
+ * 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 cn.quantgroup.tech.util.id;
+
+/**
+ * UidGenerateException
+ * 
+ * @author yutianbao
+ */
+public class UidGenerateException extends RuntimeException {
+
+    /**
+     * Serial Version UID
+     */
+    private static final long serialVersionUID = -27048199131316992L;
+
+    /**
+     * Default constructor
+     */
+    public UidGenerateException() {
+        super();
+    }
+
+    /**
+     * Constructor with message & cause
+     * 
+     * @param message
+     * @param cause
+     */
+    public UidGenerateException(String message, Throwable cause) {
+        super(message, cause);
+    }
+
+    /**
+     * Constructor with message
+     * 
+     * @param message
+     */
+    public UidGenerateException(String message) {
+        super(message);
+    }
+    
+    /**
+     * Constructor with message format
+     * 
+     * @param msgFormat
+     * @param args
+     */
+    public UidGenerateException(String msgFormat, Object... args) {
+        super(String.format(msgFormat, args));
+    }
+
+    /**
+     * Constructor with cause
+     * 
+     * @param cause
+     */
+    public UidGenerateException(Throwable cause) {
+        super(cause);
+    }
+
+}

commons-spring/src/main/java/cn/quantgroup/tech/util/id/UidGenerator.java

+package cn.quantgroup.tech.util.id;
+
+/**
+ * Represents a unique id generator.
+ *
+ * @author yutianbao
+ */
+public interface UidGenerator {
+
+    /**
+     * Get a unique ID
+     *
+     * @return UID
+     * @throws UidGenerateException
+     */
+    String getUID(String preFix) throws UidGenerateException;
+
+    /**
+     * Parse the UID into elements which are used to generate the UID. <br>
+     * Such as timestamp & workerId & sequence...
+     *
+     * @param uid
+     * @return Parsed info
+     */
+    String parseUID(long uid);
+
+}