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@Component
@Slf4j
public class TokenBucketRateLimiter implements RateLimiter {
private final String name;
private final Semaphore semaphore;
private final int maxTokens;
private final int refillTokens;
private final long refillPeriod;
private final ScheduledExecutorService scheduler;
private final AtomicInteger currentTokens;
private final AtomicLong lastRefillTime;
public TokenBucketRateLimiter(String name, int maxTokens, int refillTokens, long refillPeriod) {
this.name = name;
this.maxTokens = maxTokens;
this.refillTokens = refillTokens;
this.refillPeriod = refillPeriod;
this.semaphore = new Semaphore(maxTokens);
this.currentTokens = new AtomicInteger(maxTokens);
this.lastRefillTime = new AtomicLong(System.currentTimeMillis());
this.scheduler = Executors.newSingleThreadScheduledExecutor(r -> {
Thread thread = new Thread(r, "token-bucket-" + name);
thread.setDaemon(true);
return thread;
});
startTokenRefillTask();
}
@Override
public boolean tryAcquire() {
return tryAcquire(1);
}
@Override
public boolean tryAcquire(long timeout, TimeUnit unit) throws InterruptedException {
return tryAcquire(1, timeout, unit);
}
@Override
public void acquire() throws InterruptedException {
acquire(1);
}
@Override
public void release() {
release(1);
}
public boolean tryAcquire(int tokens) {
if (tokens <= 0) {
return true;
}
refillTokens();
if (currentTokens.get() >= tokens) {
if (currentTokens.addAndGet(-tokens) >= 0) {
try {
semaphore.acquire(tokens);
log.debug("获取令牌成功: limiter={}, tokens={}, available={}",
name, tokens, getAvailablePermits());
return true;
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
currentTokens.addAndGet(tokens);
return false;
}
} else {
currentTokens.addAndGet(tokens);
log.debug("令牌不足: limiter={}, required={}, available={}",
name, tokens, currentTokens.get());
return false;
}
}
return false;
}
public boolean tryAcquire(int tokens, long timeout, TimeUnit unit) throws InterruptedException {
if (tokens <= 0) {
return true;
}
long startTime = System.currentTimeMillis();
long timeoutMillis = unit.toMillis(timeout);
while (System.currentTimeMillis() - startTime < timeoutMillis) {
if (tryAcquire(tokens)) {
return true;
}
Thread.sleep(10);
}
return false;
}
public void acquire(int tokens) throws InterruptedException {
if (tokens <= 0) {
return;
}
while (!tryAcquire(tokens)) {
Thread.sleep(10);
}
}
public void release(int tokens) {
if (tokens <= 0) {
return;
}
semaphore.release(tokens);
currentTokens.addAndGet(tokens);
int current = currentTokens.get();
if (current > maxTokens) {
currentTokens.set(maxTokens);
}
log.debug("释放令牌成功: limiter={}, tokens={}, available={}",
name, tokens, getAvailablePermits());
}
@Override
public int getAvailablePermits() {
return Math.min(currentTokens.get(), semaphore.availablePermits());
}
@Override
public String getName() {
return name;
}
private void startTokenRefillTask() {
scheduler.scheduleAtFixedRate(() -> {
try {
refillTokens();
} catch (Exception e) {
log.error("令牌补充任务异常: limiter={}", name, e);
}
}, refillPeriod, refillPeriod, TimeUnit.MILLISECONDS);
}
private void refillTokens() {
long currentTime = System.currentTimeMillis();
long timePassed = currentTime - lastRefillTime.get();
if (timePassed >= refillPeriod) {
int tokensToAdd = (int) (timePassed / refillPeriod) * refillTokens;
if (tokensToAdd > 0) {
int current = currentTokens.get();
int newTokens = Math.min(current + tokensToAdd, maxTokens);
if (currentTokens.compareAndSet(current, newTokens)) {
lastRefillTime.set(currentTime);
log.debug("补充令牌: limiter={}, added={}, total={}",
name, tokensToAdd, newTokens);
}
}
}
}
public TokenBucketStatus getStatus() {
TokenBucketStatus status = new TokenBucketStatus();
status.setName(name);
status.setMaxTokens(maxTokens);
status.setCurrentTokens(currentTokens.get());
status.setRefillTokens(refillTokens);
status.setRefillPeriod(refillPeriod);
status.setLastRefillTime(lastRefillTime.get());
return status;
}
public void shutdown() {
scheduler.shutdown();
try {
if (!scheduler.awaitTermination(5, TimeUnit.SECONDS)) {
scheduler.shutdownNow();
}
} catch (InterruptedException e) {
scheduler.shutdownNow();
Thread.currentThread().interrupt();
}
}
}
public class TokenBucketStatus {
private String name;
private int maxTokens;
private int currentTokens;
private int refillTokens;
private long refillPeriod;
private long lastRefillTime;
}
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