From ef74dd31eab7a70866c0e09fc9369c4bf8aef9be Mon Sep 17 00:00:00 2001
From: "luca.frosini" <luca.frosini@nb-frosini.isti.cnr.it>
Date: Tue, 31 Oct 2023 15:50:16 +0100
Subject: [PATCH] Added expiring time to TypesKnowledge

---
 .../types/knowledge/TypesKnowledge.java       | 32 +++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/src/main/java/org/gcube/informationsystem/types/knowledge/TypesKnowledge.java b/src/main/java/org/gcube/informationsystem/types/knowledge/TypesKnowledge.java
index 0b5cd7b..b3cdac9 100644
--- a/src/main/java/org/gcube/informationsystem/types/knowledge/TypesKnowledge.java
+++ b/src/main/java/org/gcube/informationsystem/types/knowledge/TypesKnowledge.java
@@ -1,6 +1,8 @@
 package org.gcube.informationsystem.types.knowledge;
 
+import java.util.Calendar;
 import java.util.Collection;
+import java.util.concurrent.TimeUnit;
 
 import org.gcube.informationsystem.base.reference.AccessType;
 import org.gcube.informationsystem.model.knowledge.ModelKnowledge;
@@ -21,15 +23,35 @@ public class TypesKnowledge {
 		return instance;
 	}
 	
+	// in millisec
+	public static final long DEFAULT_EXPIRING_TIMEOUT;
+	
+	static {
+		DEFAULT_EXPIRING_TIMEOUT = TimeUnit.HOURS.toMillis(6);
+		
+	}
+	
 	protected boolean initialized;
+	public int expiringTimeout;
+	
+	// in millisec used only for logging and debugging
+	protected Calendar creationTime;
+	// in millisec
+	protected Calendar expiringTime;
+		
 	protected ModelKnowledge<Type, TypeInformation> modelKnowledge;
 	protected TypesDiscoverer<Type> typesDiscoverer;
 	
 	public TypesKnowledge() {
 		initialized = false;
+		expiringTimeout = (int) DEFAULT_EXPIRING_TIMEOUT;
 		modelKnowledge = new ModelKnowledge<>(new TypeInformation());
 	}
 	
+	public void setExpiringTimeout(int expiringTimeout) {
+		this.expiringTimeout = expiringTimeout;
+	}
+	
 	public TypesDiscoverer<Type> getTypesDiscoverer() {
 		return typesDiscoverer;
 	}
@@ -41,6 +63,11 @@ public class TypesKnowledge {
 	public ModelKnowledge<Type, TypeInformation> getModelKnowledge() {
 		if(!initialized) {
 			discover();
+		}else {
+			Calendar now = Calendar.getInstance();
+			if(now.after(expiringTime)) {
+				renew();
+			}
 		}
 		return modelKnowledge;
 	}
@@ -55,6 +82,11 @@ public class TypesKnowledge {
 				modelKnowledge.addAllType(types);
 			}
 			initialized = true;
+			this.creationTime = Calendar.getInstance();
+			this.expiringTime = Calendar.getInstance();
+			this.expiringTime.setTimeInMillis(creationTime.getTimeInMillis());
+			this.expiringTime.add(Calendar.MILLISECOND, -1);
+			this.expiringTime.add(Calendar.MILLISECOND, expiringTimeout);
 		}
 	}