/*
* 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.streaming.runtime.operators.windowing.functions;
import java.util.Collections;
import org.apache.flink.api.common.functions.IterationRuntimeContext;
import org.apache.flink.api.common.functions.RuntimeContext;
import org.apache.flink.api.java.operators.translation.WrappingFunction;
import org.apache.flink.streaming.api.functions.windowing.ProcessWindowFunction;
import org.apache.flink.streaming.api.windowing.windows.Window;
import org.apache.flink.util.Collector;
/**
* Internal window function for wrapping a {@link ProcessWindowFunction} that takes an {@code Iterable}
* when the window state is a single value.
*/
public final class InternalSingleValueProcessWindowFunction<IN, OUT, KEY, W extends Window>
extends WrappingFunction<ProcessWindowFunction<IN, OUT, KEY, W>>
implements InternalWindowFunction<IN, OUT, KEY, W> {
private static final long serialVersionUID = 1L;
private final InternalProcessWindowContext<IN, OUT, KEY, W> ctx;
public InternalSingleValueProcessWindowFunction(ProcessWindowFunction<IN, OUT, KEY, W> wrappedFunction) {
super(wrappedFunction);
ctx = new InternalProcessWindowContext<>(wrappedFunction);
}
@Override
public void process(KEY key, final W window, final InternalWindowContext context, IN input, Collector<OUT> out) throws Exception {
this.ctx.window = window;
this.ctx.internalContext = context;
ProcessWindowFunction<IN, OUT, KEY, W> wrappedFunction = this.wrappedFunction;
wrappedFunction.process(key, ctx, Collections.singletonList(input), out);
}
@Override
public void clear(final W window, final InternalWindowContext context) throws Exception {
this.ctx.window = window;
this.ctx.internalContext = context;
ProcessWindowFunction<IN, OUT, KEY, W> wrappedFunction = this.wrappedFunction;
wrappedFunction.clear(ctx);
}
@Override
public RuntimeContext getRuntimeContext() {
throw new RuntimeException("This should never be called.");
}
@Override
public IterationRuntimeContext getIterationRuntimeContext() {
throw new RuntimeException("This should never be called.");
}
}