/* * 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.flink.cep.pattern.conditions; import org.apache.flink.api.common.functions.IterationRuntimeContext; import org.apache.flink.api.common.functions.RichFunction; import org.apache.flink.api.common.functions.RuntimeContext; import org.apache.flink.configuration.Configuration; import org.apache.flink.util.Preconditions; /** * Rich variant of the {@link IterativeCondition}. As a {@link RichFunction}, it gives access to the * {@link org.apache.flink.api.common.functions.RuntimeContext} and provides setup and teardown methods: * {@link RichFunction#open(org.apache.flink.configuration.Configuration)} and * {@link RichFunction#close()}. */ public abstract class RichIterativeCondition<T> extends IterativeCondition<T> implements RichFunction { private static final long serialVersionUID = 1L; // -------------------------------------------------------------------------------------------- // Runtime context access // -------------------------------------------------------------------------------------------- private transient RuntimeContext runtimeContext; @Override public void setRuntimeContext(RuntimeContext runtimeContext) { Preconditions.checkNotNull(runtimeContext); this.runtimeContext = runtimeContext; } @Override public RuntimeContext getRuntimeContext() { if (this.runtimeContext != null) { return this.runtimeContext; } else { throw new IllegalStateException("The runtime context has not been initialized."); } } @Override public IterationRuntimeContext getIterationRuntimeContext() { throw new UnsupportedOperationException("Not support to get the IterationRuntimeContext in IterativeCondition."); } // -------------------------------------------------------------------------------------------- // Default life cycle methods // -------------------------------------------------------------------------------------------- @Override public void open(Configuration parameters) throws Exception {} @Override public void close() throws Exception {} }