Remove OrderedService references

Removed OrderedService and OrderedServiceImpl from the
drools-pdp repo to use OrderedService and OrderedServiceImpl
from the common repo. All feature interfaces were updated
occordingly.

Issue-ID: POLICY-1499
Change-Id: Icc80dd1cbe73a97d4832f95ad2dad52d948b711a
Signed-off-by: Daniel Cruz <dc443y@att.com>

2 files changed, 0 insertions, 182 deletions

diff --git a/policy-utils/src/main/java/org/onap/policy/drools/utils/OrderedService.java b/policy-utils/src/main/java/org/onap/policy/drools/utils/OrderedService.java
deleted file mode 100644
index 45ad85a8..00000000
--- a/policy-utils/src/main/java/org/onap/policy/drools/utils/OrderedService.java
+++ /dev/null
@@ -1,47 +0,0 @@
-/*-
- * ============LICENSE_START=======================================================
- * policy-utils
- * ================================================================================
- * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
- * ================================================================================
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- * 
- *      http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- * ============LICENSE_END=========================================================
- */
-
-package org.onap.policy.drools.utils;
-
-/**
- * This is a base interface that is used to control the order of a list
- * of services (features) discovered via 'ServiceLoader'. See
- * 'OrderedServiceImpl' for more details.
- */
-@FunctionalInterface
-public interface OrderedService {
-    /**
-     * Get sequence number.
-     * 
-     * @return an integer sequence number, which determines the order of a list
-     *     of objects implementing this interface
-     */
-    public int getSequenceNumber();
-
-
-    /**
-     * Get the name.
-     * 
-     * @return the name of the ordered service
-     */
-    public default String getName() {
-        return this.getClass().getName();
-    }
-}
diff --git a/policy-utils/src/main/java/org/onap/policy/drools/utils/OrderedServiceImpl.java b/policy-utils/src/main/java/org/onap/policy/drools/utils/OrderedServiceImpl.java
deleted file mode 100644
index fa0a045c..00000000
--- a/policy-utils/src/main/java/org/onap/policy/drools/utils/OrderedServiceImpl.java
+++ /dev/null
@@ -1,135 +0,0 @@
-/*
- * ============LICENSE_START=======================================================
- * policy-utils
- * ================================================================================
- * Copyright (C) 2017-2018 AT&T Intellectual Property. All rights reserved.
- * ================================================================================
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- * 
- *      http://www.apache.org/licenses/LICENSE-2.0
- * 
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- * ============LICENSE_END=========================================================
- */
-
-package org.onap.policy.drools.utils;
-
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.LinkedList;
-import java.util.List;
-import java.util.ServiceLoader;
-
-import org.slf4j.Logger;
-import org.slf4j.LoggerFactory;
-
-/**
- * This class is a template for building a sorted list of service instances,
- * which are discovered and created using 'ServiceLoader'. 
- */
-public class OrderedServiceImpl<T extends OrderedService> {
-    // logger
-    private static Logger  logger = LoggerFactory.getLogger(OrderedServiceImpl.class); 
-
-    // sorted list of instances implementing the service
-    private List<T> implementers = null;
-
-    // 'ServiceLoader' that is used to discover and create the services
-    private ServiceLoader<T> serviceLoader = null;
-
-    // use this to ensure that we only use one unique instance of each class
-    @SuppressWarnings("rawtypes")
-    private static HashMap<Class,OrderedService> classToSingleton = new HashMap<>();
-
-    /**
-     * Constructor - create the 'ServiceLoader' instance.
-     *
-     * @param clazz the class object associated with 'T' (I supposed it could
-     *     be a subclass, but I'm not sure this is useful)
-     */
-    public OrderedServiceImpl(Class<T> clazz) {
-        // This constructor wouldn't be needed if 'T.class' was legal
-        serviceLoader = ServiceLoader.load(clazz);
-    }
-
-    /**
-     * Get List of implementers.
-     * 
-     * @return the sorted list of services implementing interface 'T' discovered
-     *     by 'ServiceLoader'.
-     */
-    public synchronized List<T> getList() {
-        if (implementers == null) {
-            rebuildList();
-        }
-        return implementers;
-    }
-
-    /**
-     * This method is called by 'getList', but could also be called directly if
-     * we were running with a 'ClassLoader' that supported the dynamic addition
-     * of JAR files. In this case, it could be invoked in order to discover any
-     * new services implementing interface 'T'. This is probably a relatively
-     * expensive operation in terms of CPU and elapsed time, so it is best if it
-     * isn't invoked too frequently.
-     *
-     * @return the sorted list of services implementing interface 'T' discovered
-     *      by 'ServiceLoader'.
-     */
-    @SuppressWarnings("unchecked")
-    public synchronized List<T> rebuildList() {
-        // build a list of all of the current implementors
-        List<T> tmp = new LinkedList<>();
-        for (T service : serviceLoader) {
-            tmp.add((T)getSingleton(service));
-        }
-
-        // Sort the list according to sequence number, and then alphabetically
-        // according to full class name.
-        Collections.sort(tmp, (o1, o2) -> {
-            int s1 = o1.getSequenceNumber();
-            int s2 = o2.getSequenceNumber();
-            if (s1 < s2) {
-                return -1;
-            } else if (s1 > s2) {
-                return 1;
-            } else {
-                return o1.getClass().getName().compareTo(o2.getClass().getName());
-            }
-        });
-
-        // create an unmodifiable version of this list
-        implementers = Collections.unmodifiableList(tmp);
-        logger.info("***** OrderedServiceImpl implementers:\n {}", implementers);
-        return implementers;
-    }
-
-    /**
-     * If a service implements multiple APIs managed by 'ServiceLoader', a
-     * separate instance is created for each API. This method ensures that
-     * the first instance is used in all of the lists.
-     *
-     * @param service this is the object created by ServiceLoader
-     * @return the object to use in place of 'service'. If 'service' is the first
-     *     object of this class created by ServiceLoader, it is returned. If not,
-     *     the object of this class that was initially created is returned
-     *     instead.
-     */
-    private static synchronized OrderedService getSingleton(OrderedService service) {
-        // see if we already have an instance of this class
-        OrderedService rval = classToSingleton.get(service.getClass());
-        if (rval == null) {
-            // No previous instance of this class exists -- use the supplied
-            // instance, and place it in the table.
-            rval = service;
-            classToSingleton.put(service.getClass(), service);
-        }
-        return rval;
-    }
-}