summaryrefslogtreecommitdiffstats
path: root/env/src/main/java/org/onap/aaf/inno/env/LifeCycle.java
diff options
context:
space:
mode:
Diffstat (limited to 'env/src/main/java/org/onap/aaf/inno/env/LifeCycle.java')
-rw-r--r--env/src/main/java/org/onap/aaf/inno/env/LifeCycle.java123
1 files changed, 123 insertions, 0 deletions
diff --git a/env/src/main/java/org/onap/aaf/inno/env/LifeCycle.java b/env/src/main/java/org/onap/aaf/inno/env/LifeCycle.java
new file mode 100644
index 0000000..b2c454a
--- /dev/null
+++ b/env/src/main/java/org/onap/aaf/inno/env/LifeCycle.java
@@ -0,0 +1,123 @@
+/*******************************************************************************
+ * ============LICENSE_START====================================================
+ * * org.onap.aaf
+ * * ===========================================================================
+ * * Copyright © 2017 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====================================================
+ * *
+ * * ECOMP is a trademark and service mark of AT&T Intellectual Property.
+ * *
+ ******************************************************************************/
+/**
+ *
+ * Created on: Aug 19, 2009
+ * Created by:
+ *
+ * (c) 2009 SBC Knowledge Ventures, L.P. All rights reserved.
+ *******************************************************************
+ * RESTRICTED - PROPRIETARY INFORMATION The Information contained
+ * herein is for use only by authorized employees of AT&T Services,
+ * Inc., and authorized Affiliates of AT&T Services, Inc., and is
+ * not for general distribution within or outside the respective
+ * companies.
+ *******************************************************************
+ */
+package org.onap.aaf.inno.env;
+
+import org.onap.aaf.inno.env.util.RefreshableThreadObject;
+
+
+/**
+ *
+ */
+public interface LifeCycle {
+ /**
+ * The Service using LifeCycle Elements is required to call this method at
+ * the appropriate startup time. This is better for services than a simple
+ * static call, because the exact moment of starting can be determined
+ * programatically.
+ * <p>
+ *
+ * An excellent use is to establish security credentials with a backend
+ * after appropriate configurations have been read and available as part of
+ * the {@link Env} Object.
+ *
+ * @param env
+ * @throws APIException
+ */
+ public abstract void servicePrestart(Env env) throws APIException;
+
+ /**
+ * Many cases of implementations are not thread safe, and mechanisms must be
+ * derived to accomodate them by holding per Thread.
+ * <p>
+ *
+ * {@link ThreadLocal} is a valuable resource, but start up times within the
+ * thread, depending on what it is, can be substantial.
+ * <p>
+ *
+ * Use ThreadPrestart to do all that is possible before actually performing
+ * work, i.e. inside of a client transaction.
+ *
+ * @param env
+ * @throws APIException
+ */
+ public abstract void threadPrestart(Env env) throws APIException;
+
+ /**
+ * The Service will call this when (service-defined) configurations change.
+ * <p>
+ *
+ * This mechanism allows the Service to recognize events, such as file
+ * changes, and pass on the event to all LifeCycle implementors.
+ * <p>
+ *
+ * The code should take the opportunity to evaluate configuration and change
+ * as necessary.
+ * <p>
+ *
+ * <h2>IMPORTANT:</h2>
+ * The LifeCycle implementor cannot guarantee it will not be in the middle
+ * of a transaction, so it would behoove the implementor to construct
+ * content that does not affect anything until finished, then apply to an
+ * appropriate atomic action (i.e. setting an Object to a field), or even
+ * synchronizing.
+ *
+ * If you are using Java's "ThreadLocal", consider
+ * {@link RefreshableThreadObject}, because it implements LifeCycle, and
+ * responds to the refresh command.
+ *
+ * @param env
+ * @throws APIException
+ */
+ public abstract void refresh(Env env) throws APIException;
+
+ /**
+ * Parallel to threadPrestart, threadDestroy tells the implementor that the
+ * service is ending this particular thread, and to take this opportunity to
+ * close out any content specific to this thread that can be closed.
+ *
+ * @param env
+ * @throws APIException
+ */
+ public abstract void threadDestroy(Env env) throws APIException;
+
+ /**
+ * Parallel to servicePrestart, serviceDestroy tells the implementor that
+ * the service is ending, and to take this opportunity to close out any
+ * content under it's control that can or should be closed explicitly.
+ */
+ public abstract void serviceDestroy(Env env) throws APIException;
+}