CacheManager

src/main/java/org/redkale/cache/support/CacheManagerService.java

@@ -5,10 +5,14 @@ package org.redkale.cache.support;
 
 import java.lang.reflect.Type;
 import java.time.Duration;
+import java.util.ArrayList;
+import java.util.List;
 import java.util.Objects;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.ConcurrentHashMap;
 import java.util.concurrent.ConcurrentSkipListSet;
+import java.util.concurrent.atomic.AtomicBoolean;
+import java.util.concurrent.locks.ReentrantLock;
 import java.util.function.Supplier;
 import org.redkale.annotation.AutoLoad;
 import org.redkale.annotation.Component;
@@ -55,8 +59,11 @@ public class CacheManagerService implements CacheManager, Service {
     //缓存hash集合, 用于定时遍历删除过期数据
     protected final ConcurrentSkipListSet<String> hashNames = new ConcurrentSkipListSet<>();
 
-    //缓存无效时使用的锁
+    //缓存无效时使用的同步锁
-    private final ConcurrentHashMap<String, CacheValue> hashLock = new ConcurrentHashMap<>();
+    private final ConcurrentHashMap<String, CacheValue> syncLock = new ConcurrentHashMap<>();
+
+    //缓存无效时使用的异步锁
+    private final ConcurrentHashMap<String, CacheWaitEntry> asyncLock = new ConcurrentHashMap<>();
 
     @Resource(required = false)
     protected Application application;
@@ -155,13 +162,13 @@ public class CacheManagerService implements CacheManager, Service {
      */
     public <T> T localGet(final String hash, final String key, final Type type, Duration expire, Supplier<T> supplier) {
         Objects.requireNonNull(supplier);
-        Type t = loadCacheType(type);
+        final Type t = loadCacheType(type);
         CacheValue<T> val = localSource.hget(hash, key, t);
         if (CacheValue.isValid(val)) {
             return val.getValue();
         }
-        String lockKey = lockKey(hash, key);
+        final String lockKey = lockKey(hash, key);
-        val = hashLock.computeIfAbsent(lockKey, k -> cacheSupplier(expire, supplier).get());
+        val = syncLock.computeIfAbsent(lockKey, k -> cacheSupplier(expire, supplier).get());
         try {
             if (CacheValue.isValid(val)) {
                 localSource.hset(hash, key, t, val);
@@ -170,7 +177,7 @@ public class CacheManagerService implements CacheManager, Service {
                 return null;
             }
         } finally {
-            hashLock.remove(lockKey);
+            syncLock.remove(lockKey);
         }
     }
 
@@ -188,7 +195,36 @@ public class CacheManagerService implements CacheManager, Service {
      */
     @Override
     public <T> CompletableFuture<T> localGetAsync(String hash, String key, Type type, Duration expire, Supplier<CompletableFuture<T>> supplier) {
-        throw new UnsupportedOperationException("Not supported yet.");
+        Objects.requireNonNull(supplier);
+        final Type t = loadCacheType(type);
+        CacheValue<T> val = localSource.hget(hash, key, t);
+        if (CacheValue.isValid(val)) {
+            return CompletableFuture.completedFuture(val.getValue());
+        }
+        final String lockKey = lockKey(hash, key);
+        final CacheWaitEntry entry = asyncLock.computeIfAbsent(lockKey, k -> new CacheWaitEntry());
+        CompletableFuture<T> future = new CompletableFuture<>();
+        if (entry.compare(future)) {
+            try {
+                supplier.get().whenComplete((v, e) -> {
+                    if (e != null) {
+                        asyncLock.remove(lockKey);
+                        entry.fail(e);
+                    }
+                    CacheValue<T> rs = cacheFunc(expire, v);
+                    if (CacheValue.isValid(val)) {
+                        localSource.hset(hash, key, t, val);
+                    }
+                    asyncLock.remove(lockKey);
+                    entry.success(CacheValue.get(rs));
+                });
+            } catch (Throwable e) {
+                asyncLock.remove(lockKey);
+                entry.fail(e);
+                return CompletableFuture.failedFuture(e);
+            }
+        }
+        return future;
     }
 
     /**
@@ -202,7 +238,10 @@ public class CacheManagerService implements CacheManager, Service {
      * @param expire 过期时长，为null表示永不过期
      */
     @Override
-    public <T> void localSet(String hash, String key, Type type, T value, Duration expire) {
+    public <T> void localSet(String hash, String key,
+        Type type, T value,
+        Duration expire
+    ) {
         Type t = loadCacheType(type, value);
         CacheValue val = CacheValue.create(value, expire);
         localSource.hset(hash, key, t, val);
@@ -217,7 +256,8 @@ public class CacheManagerService implements CacheManager, Service {
      * @return 删除数量
      */
     @Override
-    public long localDel(String hash, String key) {
+    public long localDel(String hash, String key
+    ) {
         return localSource.hdel(hash, key);
     }
 
@@ -233,7 +273,9 @@ public class CacheManagerService implements CacheManager, Service {
      * @return 数据值
      */
     @Override
-    public <T> T remoteGet(final String hash, final String key, final Type type) {
+    public <T> T remoteGet(
+        final String hash, final String key, final Type type
+    ) {
         Type t = loadCacheType(type);
         CacheValue<T> val = remoteSource.hget(hash, key, t);
         return CacheValue.get(val);
@@ -250,7 +292,10 @@ public class CacheManagerService implements CacheManager, Service {
      * @return 数据值
      */
     @Override
-    public <T> CompletableFuture<T> remoteGetAsync(final String hash, final String key, final Type type) {
+    public <T> CompletableFuture<T>
+        remoteGetAsync(
+            final String hash, final String key, final Type type
+        ) {
         Type t = loadCacheType(type);
         CompletableFuture<CacheValue<T>> future = remoteSource.hgetAsync(hash, key, t);
         return future.thenApply(CacheValue::get);
@@ -497,4 +542,61 @@ public class CacheManagerService implements CacheManager, Service {
         return cacheValueTypes.computeIfAbsent(type, t -> TypeToken.createParameterizedType(null, CacheValue.class, type));
     }
 
+    protected static class CacheWaitEntry {
+
+        private static final Object NIL = new Object();
+
+        private final AtomicBoolean state = new AtomicBoolean();
+
+        private final List<CompletableFuture> futures = new ArrayList<>();
+
+        private final ReentrantLock lock = new ReentrantLock();
+
+        private Object resultObj = NIL;
+
+        private Throwable resultExp;
+
+        public boolean compare(CompletableFuture future) {
+            lock.lock();
+            try {
+                if (resultObj != NIL) {
+                    future.complete(resultObj);
+                    return false;
+                } else if (resultExp != null) {
+                    future.completeExceptionally(resultExp);
+                    return false;
+                }
+                boolean rs = state.compareAndSet(false, true);
+                this.futures.add(future);
+                return rs;
+            } finally {
+                lock.unlock();
+            }
+        }
+
+        public void fail(Throwable t) {
+            lock.lock();
+            try {
+                this.resultExp = t;
+                for (CompletableFuture future : futures) {
+                    future.completeExceptionally(t);
+                }
+            } finally {
+                lock.unlock();
+            }
+        }
+
+        public <T> void success(T val) {
+            lock.lock();
+            try {
+                this.resultObj = val;
+                for (CompletableFuture future : futures) {
+                    future.complete(val);
+                }
+            } finally {
+                lock.unlock();
+            }
+        }
+
+    }
 }