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package io.mcarle.sciurus.cache; |
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import io.mcarle.sciurus.ExecutionIdentifier; |
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import io.mcarle.sciurus.annotation.Cache; |
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import org.aspectj.lang.ProceedingJoinPoint; |
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import org.slf4j.Logger; |
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import org.slf4j.LoggerFactory; |
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import java.io.Serializable; |
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import java.time.Duration; |
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class CacheAspectHandler { |
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private static final Logger LOG = LoggerFactory.getLogger(CacheAspectHandler.class); |
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private final static Object EMPTY = CustomCache.EMPTY; |
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@SuppressWarnings({"finally", "ReturnInsideFinallyBlock"}) |
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static Object executeAndCache(ProceedingJoinPoint joinPoint, Cache cache) throws Throwable { |
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ExecutionIdentifier executionIdentifier = null; |
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Object result = EMPTY; |
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try { |
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// check for any cached value |
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executionIdentifier = new ExecutionIdentifier(joinPoint.getSignature().toLongString(), joinPoint.getArgs()); |
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result = loadFromCache(executionIdentifier, cache); |
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} finally { |
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if (result != EMPTY) { |
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// if cached value was found, return it |
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return result; |
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} |
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// if no cached value is present, execute method |
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result = joinPoint.proceed(); |
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// if successfull |
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try { |
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// save the result into cache |
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saveIntoCache(executionIdentifier, (Serializable) result, cache); |
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} finally { |
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// despite any errors while saving to cache, ignore them and return the result |
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return result; |
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} |
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} |
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} |
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private static Object loadFromCache(ExecutionIdentifier executionIdentifier, Cache cache) { |
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CustomCache customCache = getCache(cache, executionIdentifier); |
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if (customCache != null) { |
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try { |
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return customCache.get(executionIdentifier); |
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} catch (Throwable t) { |
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LOG.warn("Got exception from cache '{}' while reading: {}", cache.cacheName(), executionIdentifier, t); |
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} |
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} |
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return EMPTY; |
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} |
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private static void saveIntoCache(ExecutionIdentifier executionIdentifier, Serializable result, Cache cache) { |
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CustomCache customCache = getCache(cache, executionIdentifier); |
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if (customCache != null) { |
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try { |
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customCache.put(executionIdentifier, result, Duration.of(cache.time(), cache.unit())); |
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} catch (Throwable t) { |
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LOG.warn("Got exception from cache '{}' while storing: {}", cache.cacheName(), executionIdentifier, t); |
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} |
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} |
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} |
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private static CustomCache getCache(Cache cache, ExecutionIdentifier executionIdentifier) { |
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try { |
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return CacheRegister.INSTANCE.getCache(cache.cacheName()); |
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} catch (CacheException.UnknownCache ce) { |
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LOG.warn("No cache with name '{}' registered: {}", cache.cacheName(), executionIdentifier); |
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} catch (CacheException.CacheSupplierReturnedNull ce) { |
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LOG.warn("Cache returned from supplier for '{}' was null: {}", cache.cacheName(), executionIdentifier); |
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} catch (CacheException.CacheSupplierThrewException ce) { |
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LOG.warn("Got exception from cache supplier for '{}': {}", cache.cacheName(), executionIdentifier, ce.getCause()); |
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} |
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return null; |
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} |
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} |
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mcarleio /
sciurus
