| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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 org.apache.samza.context; |
| |
| import org.apache.samza.job.model.JobModel; |
| import org.apache.samza.system.StreamMetadataCache; |
| import org.apache.samza.system.SystemStreamPartition; |
| |
| import java.util.HashMap; |
| import java.util.Map; |
| import java.util.Set; |
| |
| |
| /** |
| * This class is used for passing objects around for the implementation of the high-level API. |
| * 1) Container for objects that need to be passed between different components in the implementation of the high-level |
| * API. |
| * 2) The implementation of the high-level API is built on top of the low-level API. The low-level API only exposes |
| * {@link TaskContext}, but the implementation of the high-level API needs some other internal Samza components (e.g. |
| * {@link StreamMetadataCache}. We internally make these components available through {@link TaskContextImpl} so that we |
| * can do a cast to access the components. This class hides some of the messiness of casting. It's still not ideal to |
| * need to do any casting, even in this class. |
| */ |
| public class InternalTaskContext { |
| private final Context context; |
| private final Map<String, Object> objectRegistry = new HashMap<>(); |
| |
| public InternalTaskContext(Context context) { |
| this.context = context; |
| } |
| |
| public void registerObject(String name, Object value) { |
| this.objectRegistry.put(name, value); |
| } |
| |
| public Object fetchObject(String name) { |
| return this.objectRegistry.get(name); |
| } |
| |
| public Context getContext() { |
| return context; |
| } |
| |
| /** |
| * TODO: The public {@link JobContext} exposes {@link JobModel} now, so can this internal method be replaced by the |
| * public API? |
| */ |
| public JobModel getJobModel() { |
| return ((TaskContextImpl) this.context.getTaskContext()).getJobModel(); |
| } |
| |
| public StreamMetadataCache getStreamMetadataCache() { |
| return ((TaskContextImpl) this.context.getTaskContext()).getStreamMetadataCache(); |
| } |
| |
| /** |
| * See {@link TaskContextImpl#getSspsExcludingSideInputs()}. |
| */ |
| public Set<SystemStreamPartition> getSspsExcludingSideInputs() { |
| return ((TaskContextImpl) this.context.getTaskContext()).getSspsExcludingSideInputs(); |
| } |
| } |