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src/test/java/com/alibaba/druid/spring/SequenceService.java

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+package com.alibaba.druid.spring;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+import org.springframework.transaction.annotation.Propagation;
+import org.springframework.transaction.annotation.Transactional;
+
+public class SequenceService implements SequenceServiceMBean, ISequenceService {
+
+    private ISequenceDao   dao;
+    private String        name      = "druid-spring-test";
+
+    private String        seed;
+
+    private AtomicInteger increment = new AtomicInteger();
+
+    public ISequenceDao getDao() {
+        return dao;
+    }
+
+    public void setDao(ISequenceDao dao) {
+        this.dao = dao;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public String getSeed() {
+        return this.seed;
+    }
+
+    @Transactional(propagation = Propagation.NOT_SUPPORTED)
+    public long nextValue() {
+        if (seed == null) {
+            init();
+        }
+
+        int value = increment.getAndIncrement();
+
+        String text = seed + "9" + Integer.toString(value);
+
+        return Long.parseLong(text);
+    }
+
+    @Transactional(propagation = Propagation.NOT_SUPPORTED)
+    public synchronized void init() {
+        this.seed = nextSeed();
+    }
+
+    @Transactional(propagation = Propagation.NOT_SUPPORTED)
+    public synchronized String nextSeed() {
+        for (;;) {
+            int value = dao.getValue(name);
+            if (dao.compareAndSet(name, value + 1, value)) {
+                if (value == 0) {
+                    return "";
+                } else {
+                    return Integer.toString(value, 9);
+                }
+            }
+        }
+    }
+
+}