| /* |
| * Druid - a distributed column store. |
| * Copyright 2012 - 2015 Metamarkets Group Inc. |
| * |
| * 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. |
| */ |
| |
| package io.druid.common.aws; |
| |
| import com.amazonaws.auth.AWSCredentialsProvider; |
| |
| public class LazyFileSessionCredentialsProvider implements AWSCredentialsProvider |
| { |
| private AWSCredentialsConfig config; |
| private FileSessionCredentialsProvider provider; |
| |
| public LazyFileSessionCredentialsProvider(AWSCredentialsConfig config) { |
| this.config = config; |
| } |
| |
| private FileSessionCredentialsProvider getUnderlyingProvider() { |
| if (provider == null) { |
| synchronized (config) { |
| if (provider == null) { |
| provider = new FileSessionCredentialsProvider(config.getFileSessionCredentials()); |
| } |
| } |
| } |
| return provider; |
| } |
| |
| @Override |
| public com.amazonaws.auth.AWSCredentials getCredentials() |
| { |
| return getUnderlyingProvider().getCredentials(); |
| } |
| |
| @Override |
| public void refresh() { |
| getUnderlyingProvider().refresh(); |
| } |
| } |