refactor: use PGProperty enum instead of text ref for targetServerTyp…

…e, hostRecheckSeconds, loadBalanceHosts (#912) (#915)

pgjdbc/src/main/java/org/postgresql/core/v3/ConnectionFactoryImpl.java

@@ -117,12 +117,12 @@ public QueryExecutor openConnectionImpl(HostSpec[] hostSpecs, String user, Strin
 
     // - the targetServerType setting
     HostRequirement targetServerType;
+    String targetServerTypeStr = PGProperty.TARGET_SERVER_TYPE.get(info);
     try {
-      targetServerType =
-          HostRequirement.valueOf(info.getProperty("targetServerType", HostRequirement.any.name()));
+      targetServerType = HostRequirement.valueOf(targetServerTypeStr);
     } catch (IllegalArgumentException ex) {
       throw new PSQLException(
-          GT.tr("Invalid targetServerType value: {0}", info.getProperty("targetServerType")),
+          GT.tr("Invalid targetServerType value: {0}", targetServerTypeStr),
           PSQLState.CONNECTION_UNABLE_TO_CONNECT);
     }
 

pgjdbc/src/main/java/org/postgresql/hostchooser/MultiHostChooser.java

@@ -5,14 +5,14 @@
 
 package org.postgresql.hostchooser;
 
-import static java.lang.Boolean.parseBoolean;
-import static java.lang.Integer.parseInt;
 import static java.util.Arrays.asList;
 import static java.util.Collections.shuffle;
 import static java.util.Collections.sort;
 
+import org.postgresql.PGProperty;
 import org.postgresql.hostchooser.GlobalHostStatusTracker.HostSpecStatus;
 import org.postgresql.util.HostSpec;
+import org.postgresql.util.PSQLException;
 
 import java.util.ArrayList;
 import java.util.Comparator;
@@ -33,8 +33,12 @@ protected MultiHostChooser(HostSpec[] hostSpecs, HostRequirement targetServerTyp
       Properties info) {
     this.hostSpecs = hostSpecs;
     this.targetServerType = targetServerType;
-    hostRecheckTime = parseInt(info.getProperty("hostRecheckSeconds", "10")) * 1000;
-    loadBalance = parseBoolean(info.getProperty("loadBalanceHosts", "false"));
+    try {
+      hostRecheckTime = PGProperty.HOST_RECHECK_SECONDS.getInt(info) * 1000;
+      loadBalance = PGProperty.LOAD_BALANCE_HOSTS.getBoolean(info);
+    } catch (PSQLException e) {
+      throw new RuntimeException(e);
+    }
   }
 
   @Override