IDEMPIERE-5046 Implement background reset of expire cache (#987)

org.adempiere.base/src/org/compiere/Adempiere.java

@@ -584,24 +584,26 @@ public final class Adempiere
 		}
 	}
 
-	private static void createThreadPool() {
-		int max = Runtime.getRuntime().availableProcessors() * 20;
-		int defaultMax = max;
-		Properties properties = Ini.getProperties();
-		String maxSize = properties.getProperty("MaxThreadPoolSize");
-		if (maxSize != null) {
-			try {
-				max = Integer.parseInt(maxSize);
-			} catch (Exception e) {}
+	private static synchronized void createThreadPool() {
+		if (threadPoolExecutor == null) {
+			int max = Runtime.getRuntime().availableProcessors() * 20;
+			int defaultMax = max;
+			Properties properties = Ini.getProperties();
+			String maxSize = properties.getProperty("MaxThreadPoolSize");
+			if (maxSize != null) {
+				try {
+					max = Integer.parseInt(maxSize);
+				} catch (Exception e) {}
+			}
+			if (max <= 0) {
+				max = defaultMax;
+			}
+			
+			// start thread pool
+			threadPoolExecutor = new ScheduledThreadPoolExecutor(max);		
+			
+			Trx.startTrxMonitor();
 		}
-		if (max <= 0) {
-			max = defaultMax;
-		}
-		
-		// start thread pool
-		threadPoolExecutor = new ScheduledThreadPoolExecutor(max);		
-		
-		Trx.startTrxMonitor();
 	}
 
 	/**
@@ -690,11 +692,18 @@ public final class Adempiere
 	public static synchronized void stop() {
 		if (threadPoolExecutor != null) {
 			threadPoolExecutor.shutdown();
+			threadPoolExecutor = null;
 		}
 		log = null;
 	}
 	
-	public static ScheduledThreadPoolExecutor getThreadPoolExecutor() {
+	/**
+	 * 
+	 * @return {@link ScheduledThreadPoolExecutor}
+	 */
+	public static synchronized ScheduledThreadPoolExecutor getThreadPoolExecutor() {
+		if (threadPoolExecutor == null)
+			createThreadPool();
 		return threadPoolExecutor;
 	}
 	

org.adempiere.base/src/org/compiere/util/CCache.java

@@ -454,19 +454,43 @@ public class CCache<K,V> implements CacheInterface, Map<K, V>, Serializable
 	public void newRecord(int record_ID) {
 	}
 
+	/**
+	 * 
+	 * @return max size of cache
+	 */
 	public int getMaxSize() {
 		return m_maxSize;
 	}
 	
+	/**
+	 * 
+	 * @return true if cache is distributed (using hazelcast)
+	 */
 	public boolean isDistributed() {
 		return m_distributed;
 	}
 	
+	/**
+	 * 
+	 * @return cache hit count
+	 */
 	public long getHit() {
 		return m_hit.get();
 	}
 	
+	/**
+	 * 
+	 * @return cache miss count
+	 */
 	public long getMiss() {
 		return m_miss.get();
 	}	
+	
+	/**
+	 * 
+	 * @return true if cache has expire
+	 */
+	public boolean isExpire() {
+		return m_expire > 0 && m_timeExp > 0 && m_timeExp < System.currentTimeMillis();
+	}
 }	//	CCache

org.adempiere.base/src/org/compiere/util/CacheMgt.java

@@ -24,9 +24,11 @@ import java.util.List;
 import java.util.Map;
 import java.util.concurrent.ExecutionException;
 import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
 import java.util.logging.Level;
 
 import org.adempiere.base.Core;
+import org.compiere.Adempiere;
 import org.idempiere.distributed.ICacheService;
 import org.idempiere.distributed.IClusterMember;
 import org.idempiere.distributed.IClusterService;
@@ -46,7 +48,10 @@ public class CacheMgt
 	public static synchronized CacheMgt get()
 	{
 		if (s_cache == null)
+		{
 			s_cache = new CacheMgt();
+			startCacheMonitor();
+		}
 		return s_cache;
 	}	//	get
 
@@ -68,7 +73,9 @@ public class CacheMgt
 	private static CLogger		log = CLogger.getCLogger(CacheMgt.class);
 	/** Cache change listeners **/
 	private List<CacheChangeListener> m_listeners = new ArrayList<CacheChangeListener>();
-
+	/** Background monitor to clear expire cache */
+	private static final CacheMgt.CacheMonitor s_monitor = new CacheMgt.CacheMonitor();
+	/** Default maximum cache size **/
 	public static int MAX_SIZE = 1000;
 	static 
 	{
@@ -441,4 +448,35 @@ public class CacheMgt
 	        return maxSize <= 0 ? false : size() > maxSize;
 	    }
 	}
+	
+	private static synchronized void startCacheMonitor()
+	{
+		Adempiere.getThreadPoolExecutor().scheduleWithFixedDelay(s_monitor, 5, 5, TimeUnit.MINUTES);
+	}
+
+	private static class CacheMonitor implements Runnable
+	{
+
+		public void run()
+		{
+			CacheMgt instance = CacheMgt.get();
+			if (!instance.m_instances.isEmpty())
+			{
+				CacheInterface[] caches = instance.m_instances.toArray(new CacheInterface[0]);
+				for(int i = 0; i < caches.length; i++)
+				{
+					if (!(caches[i] instanceof CCache<?, ?>))
+						continue;
+					CCache<?, ?> cache = (CCache<?, ?>) caches[i];
+					if (cache.isDistributed() || cache.getExpireMinutes() <= 0)
+						continue;
+
+					if (cache.isExpire())
+					{
+						cache.reset();
+					}
+				}
+			}
+		}
+	}
 }	//	CCache