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+/*******************************************************************************
+ * ============LICENSE_START====================================================
+ * * org.onap.aai
+ * * ===========================================================================
+ * * Copyright © 2017 AT&T Intellectual Property. All rights reserved.
+ * * Copyright © 2017 Amdocs
+ * * ===========================================================================
+ * * 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====================================================
+ * *
+ * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ * *
+ ******************************************************************************/
+package com.att.inno.env.util;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
+import com.att.inno.env.APIException;
+import com.att.inno.env.Creatable;
+import com.att.inno.env.Env;
+import com.att.inno.env.LifeCycle;
+
+
+/**
+ * <h1>RefreshableThreadObject</h1>
+ * This is a ThreadLocal like implementation, but it responds to
+ * the {@link LifeCycle} mechanism for configuration refreshes, and
+ * implements {@link Creatable} (for use in destroy, etc).<p>
+ *
+ * In addition to the Thread instance semantics, it compares when the object
+ * was created versus the last "refresh(env)" call when getting, for the
+ * thread, and if necessary to replace the created object, destroying the
+ * previous.<p>
+ *
+ * In most cases, it's better to use the new "Pool" mechanism, as it deals with
+ * gaining and returning resources on an as needed basis. This, however, remains
+ * in the cases where specific Objects need to be retained to specific Threads.<p>
+ *
+ * There is no way to do this kind of specialized behavior in ThreadLocal.
+ *
+ *
+ * @param <T>
+ */
+public class RefreshableThreadObject<T extends Creatable<T>> {
+ private Map<Thread,T> objs;
+ private long refreshed;
+ private Constructor<T> cnst;
+
+ /**
+ * The passed in class <b>must</b> implement the constructor
+ * <pre>
+ * public MyClass(Env env) {
+ * ...
+ * }
+ * </pre>
+ * @param clss
+ * @throws APIException
+ */
+ public RefreshableThreadObject(Class<T> clss) throws APIException {
+ objs = Collections.synchronizedMap(new HashMap<Thread,T>());
+ try {
+ cnst = clss.getConstructor(new Class[]{Env.class} );
+ } catch (Exception e) {
+ throw new APIException(e);
+ }
+ }
+
+ /**
+ * Get the "T" class from the current thread
+ *
+ * @param env
+ * @return T
+ * @throws APIException
+ */
+ public T get(Env env) throws APIException {
+ Thread t = Thread.currentThread();
+ T obj = objs.get(t);
+ if(obj==null || refreshed>obj.created()) {
+ try {
+ obj = cnst.newInstance(new Object[]{env});
+ } catch (InvocationTargetException e) {
+ throw new APIException(e.getTargetException());
+ } catch (Exception e) {
+ throw new APIException(e);
+ }
+ T destroyMe = objs.put(t,obj);
+ if(destroyMe!=null) {
+ destroyMe.destroy(env);
+ }
+ }
+ return obj;
+ }
+
+ /**
+ * Mark the timestamp of refreshed.
+ *
+ * @param env
+ */
+ public void refresh(Env env) {
+ refreshed = System.currentTimeMillis();
+ }
+
+ /**
+ * Remove the object from the Thread instances
+ * @param env
+ */
+ public void remove(Env env) {
+ T obj = objs.remove(Thread.currentThread());
+ if(obj!=null)
+ obj.destroy(env);
+ }
+}