Move RefreshConfigTask under tasks

[nonrtric.git] / policy-agent / src / main / java / org / oransc / policyagent / configuration / ApplicationConfig.java

diff --git a/policy-agent/src/main/java/org/oransc/policyagent/configuration/ApplicationConfig.java b/policy-agent/src/main/java/org/oransc/policyagent/configuration/ApplicationConfig.java
index d8da5ee..fee0181 100644 (file)
--- a/policy-agent/src/main/java/org/oransc/policyagent/configuration/ApplicationConfig.java
+++ b/policy-agent/src/main/java/org/oransc/policyagent/configuration/ApplicationConfig.java
@@ -20,61 +20,46 @@
 
 package org.oransc.policyagent.configuration;
 
-import com.google.gson.GsonBuilder;
-import com.google.gson.JsonElement;
-import com.google.gson.JsonObject;
-import com.google.gson.JsonParser;
-import com.google.gson.JsonSyntaxException;
-import com.google.gson.TypeAdapterFactory;
-
-import java.io.BufferedInputStream;
-import java.io.FileInputStream;
-import java.io.IOException;
-import java.io.InputStream;
-import java.io.InputStreamReader;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
 import java.util.Optional;
-import java.util.Properties;
-import java.util.ServiceLoader;
 import java.util.Vector;
 
 import javax.validation.constraints.NotEmpty;
 import javax.validation.constraints.NotNull;
 
 import org.oransc.policyagent.exceptions.ServiceException;
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Autowired;
-import org.springframework.beans.factory.annotation.Value;
 import org.springframework.boot.context.properties.ConfigurationProperties;
 import org.springframework.boot.context.properties.EnableConfigurationProperties;
-import reactor.core.publisher.Mono;
 
 @EnableConfigurationProperties
 @ConfigurationProperties("app")
 public class ApplicationConfig {
-    private static final Logger logger = LoggerFactory.getLogger(ApplicationConfig.class);
-
-    @Value("#{systemEnvironment}")
-    Properties systemEnvironment;
-
     @NotEmpty
     private String filepath;
 
-    private Vector<RicConfig> ricConfigs;
+    private Collection<Observer> observers = new Vector<>();
+    private Map<String, RicConfig> ricConfigs = new HashMap<>();
 
     @Autowired
     public ApplicationConfig() {
     }
 
+    public String getLocalConfigurationFilePath() {
+        return this.filepath;
+    }
+
     public synchronized void setFilepath(String filepath) {
         this.filepath = filepath;
     }
 
-    public Vector<RicConfig> getRicConfigs() {
-        return this.ricConfigs;
+    public synchronized Collection<RicConfig> getRicConfigs() {
+        return this.ricConfigs.values();
     }
 
-    public Optional<RicConfig> lookupRicConfigForManagedElement(String managedElementId) {
+    public synchronized Optional<RicConfig> lookupRicConfigForManagedElement(String managedElementId) {
         for (RicConfig ricConfig : getRicConfigs()) {
             if (ricConfig.managedElementIds().contains(managedElementId)) {
                 return Optional.of(ricConfig);
@@ -92,42 +77,59 @@ public class ApplicationConfig {
         throw new ServiceException("Could not find ric: " + ricName);
     }
 
-    public void initialize() {
-        loadConfigurationFromFile(this.filepath);
+    public static enum RicConfigUpdate {
+        ADDED, CHANGED, REMOVED
     }
 
-    Mono<Environment.Variables> getEnvironment(Properties systemEnvironment) {
-        return Environment.readEnvironmentVariables(systemEnvironment);
+    public interface Observer {
+        void onRicConfigUpdate(RicConfig ric, RicConfigUpdate event);
     }
 
-    /**
-     * Reads the configuration from file.
-     */
-    protected void loadConfigurationFromFile(String filepath) {
-        GsonBuilder gsonBuilder = new GsonBuilder();
-        ServiceLoader.load(TypeAdapterFactory.class).forEach(gsonBuilder::registerTypeAdapterFactory);
-
-        try (InputStream inputStream = createInputStream(filepath)) {
-            JsonParser parser = new JsonParser();
-            JsonObject rootObject = getJsonElement(parser, inputStream).getAsJsonObject();
-            if (rootObject == null) {
-                throw new JsonSyntaxException("Root is not a json object");
-            }
-            ApplicationConfigParser appParser = new ApplicationConfigParser();
-            appParser.parse(rootObject);
-            this.ricConfigs = appParser.getRicConfigs();
-            logger.info("Local configuration file loaded: {}", filepath);
-        } catch (JsonSyntaxException | ServiceException | IOException e) {
-            logger.trace("Local configuration file not loaded: {}", filepath, e);
-        }
+    public void addObserver(Observer o) {
+        this.observers.add(o);
     }
 
-    JsonElement getJsonElement(JsonParser parser, InputStream inputStream) {
-        return parser.parse(new InputStreamReader(inputStream));
+    private class Notification {
+        final RicConfig ric;
+        final RicConfigUpdate event;
+
+        Notification(RicConfig ric, RicConfigUpdate event) {
+            this.ric = ric;
+            this.event = event;
+        }
     }
 
-    InputStream createInputStream(@NotNull String filepath) throws IOException {
-        return new BufferedInputStream(new FileInputStream(filepath));
+    public void setConfiguration(@NotNull Collection<RicConfig> ricConfigs) {
+        Collection<Notification> notifications = new Vector<>();
+        synchronized (this) {
+            Map<String, RicConfig> newRicConfigs = new HashMap<>();
+            for (RicConfig newConfig : ricConfigs) {
+                RicConfig oldConfig = this.ricConfigs.get(newConfig.name());
+                if (oldConfig == null) {
+                    newRicConfigs.put(newConfig.name(), newConfig);
+                    notifications.add(new Notification(newConfig, RicConfigUpdate.ADDED));
+                    this.ricConfigs.remove(newConfig.name());
+                } else if (!newConfig.equals(newConfig)) {
+                    notifications.add(new Notification(newConfig, RicConfigUpdate.CHANGED));
+                    newRicConfigs.put(newConfig.name(), newConfig);
+                    this.ricConfigs.remove(newConfig.name());
+                } else {
+                    newRicConfigs.put(oldConfig.name(), oldConfig);
+                }
+            }
+            for (RicConfig deletedConfig : this.ricConfigs.values()) {
+                notifications.add(new Notification(deletedConfig, RicConfigUpdate.REMOVED));
+            }
+            this.ricConfigs = newRicConfigs;
+        }
+        notifyObservers(notifications);
     }
 
+    private void notifyObservers(Collection<Notification> notifications) {
+        for (Observer observer : this.observers) {
+            for (Notification notif : notifications) {
+                observer.onRicConfigUpdate(notif.ric, notif.event);
+            }
+        }
+    }
 }