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author | 2018-07-30 15:56:09 -0400 | |
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committer | 2018-07-31 11:09:25 -0400 | |
commit | 5a6a6de6f1a26a1897e4917a0df613e25a24eb70 (patch) | |
tree | 59a968f27b4b603aacc9d5e7b51fb598aeec5321 /common/src/main/java/org/onap/so/client/RestPropertiesLoader.java | |
parent | b6dc38501f3b746426b42d9de4cc883d894149e8 (diff) |
Containerization feature of SO
Change-Id: I95381232eeefcd247a66a5cec370a8ce1c288e18
Issue-ID: SO-670
Signed-off-by: Benjamin, Max (mb388a) <mb388a@us.att.com>
Diffstat (limited to 'common/src/main/java/org/onap/so/client/RestPropertiesLoader.java')
-rw-r--r-- | common/src/main/java/org/onap/so/client/RestPropertiesLoader.java | 79 |
1 files changed, 79 insertions, 0 deletions
diff --git a/common/src/main/java/org/onap/so/client/RestPropertiesLoader.java b/common/src/main/java/org/onap/so/client/RestPropertiesLoader.java new file mode 100644 index 0000000000..570b48ecb8 --- /dev/null +++ b/common/src/main/java/org/onap/so/client/RestPropertiesLoader.java @@ -0,0 +1,79 @@ +/*- + * ============LICENSE_START======================================================= + * ONAP - SO + * ================================================================================ + * Copyright (C) 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========================================================= + */ + +package org.onap.so.client; + +import java.util.Iterator; +import java.util.ServiceLoader; + +public class RestPropertiesLoader { + + /* required to make ServiceLoader thread safe */ + private static final ThreadLocal<ServiceLoader<RestProperties>> services = new ThreadLocal<ServiceLoader<RestProperties>>() { + @Override + protected ServiceLoader<RestProperties> initialValue() { + return ServiceLoader.load(RestProperties.class); + } + }; + private RestPropertiesLoader() { + } + + private static class Helper { + private static final RestPropertiesLoader INSTANCE = new RestPropertiesLoader(); + } + + public static RestPropertiesLoader getInstance() { + return Helper.INSTANCE; + } + + public <T> T getNewImpl(Class<? extends RestProperties> clazz) { + return this.getImpl(clazz, true); + } + public <T> T getImpl(Class<? extends RestProperties> clazz) { + return this.getImpl(clazz, false); + } + + private <T> T getImpl(Class<? extends RestProperties> clazz, boolean forceNewInstance) { + T result = null; + ServiceLoader<RestProperties> loader = this.services.get(); + Iterator<RestProperties> propertyImpls = loader.iterator(); + RestProperties item; + while (propertyImpls.hasNext()) { + item = propertyImpls.next(); + if (clazz.isAssignableFrom(item.getClass())) { + try { + if (forceNewInstance) { + result = (T)item.getClass().newInstance(); + } else { + result = (T)item; + } + } catch (InstantiationException | IllegalAccessException e) { + /* all spi implementations must provide a public + * no argument constructor + */ + + } + //break; + } + } + + return result; + } +} |