| /** |
| * 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.crunch; |
| |
| /** |
| * A {@code PObject} represents a singleton object value that results from a distributed |
| * computation. Computation producing the value is deferred until |
| * {@link org.apache.crunch.PObject#getValue()} is called. |
| * |
| * @param <T> The type of value encapsulated by this {@code PObject}. |
| */ |
| public interface PObject<T> { |
| /** |
| * Gets the value associated with this {@code PObject}. Calling this method will trigger |
| * whatever computation is necessary to obtain the value and block until that computation |
| * succeeds. |
| * |
| * @return The value associated with this {@code PObject}. |
| */ |
| T getValue(); |
| } |