Started implementing mdm passive mode

hapi-fhir-base/src/main/java/ca/uhn/fhir/interceptor/api/IBaseInterceptorService.java

@@ -48,6 +48,11 @@ public interface IBaseInterceptorService<POINTCUT extends IPointcut> extends IBa
 	 */
 	List<Object> getAllRegisteredInterceptors();
 
+
+	default boolean hasRegisteredInterceptor(Class<?> theInterceptorClass) {
+		return getAllRegisteredInterceptors().stream().anyMatch(t -> t.getClass().equals(theInterceptorClass));
+	}
+
 	/**
 	 * Unregisters all registered interceptors.
 	 */

hapi-fhir-server-mdm/src/main/java/ca/uhn/fhir/mdm/api/IMdmSettings.java

@@ -72,4 +72,7 @@ public interface IMdmSettings {
 	default void setAutoExpungeGoldenResources(boolean theShouldAutoExpunge) {
 		throw new UnsupportedOperationException(Msg.code(2427));
 	}
+
+	// In passive mode, the Patient/$match operation is available, but no mdm processing takes place.
+	boolean isPassiveModeEnabled();
 }

hapi-fhir-server-mdm/src/main/java/ca/uhn/fhir/mdm/rules/config/MdmSettings.java

@@ -42,6 +42,7 @@ public class MdmSettings implements IMdmSettings {
 	private String myGoldenResourcePartitionName;
 	private boolean mySearchAllPartitionForMatch = false;
 	private boolean myShouldAutoDeleteGoldenResources = true;
+	private boolean myPassiveModeEnabled = false;
 
 	/**
 	 * If disabled, the underlying MDM system will operate under the following assumptions:
@@ -169,4 +170,13 @@ public class MdmSettings implements IMdmSettings {
 	public void setAutoExpungeGoldenResources(boolean theShouldAutoExpunge) {
 		myShouldAutoDeleteGoldenResources = theShouldAutoExpunge;
 	}
+
+	public void setPassiveModeEnabled(boolean thePassiveModeEnabled) {
+		myPassiveModeEnabled = thePassiveModeEnabled;
+	}
+
+	@Override
+	public boolean isPassiveModeEnabled() {
+		return myPassiveModeEnabled;
+	}
 }