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[FLINK-35795][API] Introduce the framework of ProcessFunction Attribute
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flink-core/src/main/java/org/apache/flink/api/common/attribute/Attribute.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.api.common.attribute; | ||
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| import org.apache.flink.annotation.Internal; | ||
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| import java.io.Serializable; | ||
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| /** {@link Attribute} contains the information about the process logic of a process function. */ | ||
| @Internal | ||
| public class Attribute implements Serializable { | ||
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| private boolean isNoOutputUntilEndOfInput; | ||
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| private Attribute(boolean isNoOutputUntilEndOfInput) { | ||
| this.isNoOutputUntilEndOfInput = isNoOutputUntilEndOfInput; | ||
| } | ||
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| public boolean isNoOutputUntilEndOfInput() { | ||
| return isNoOutputUntilEndOfInput; | ||
| } | ||
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| public void setNoOutputUntilEndOfInput(boolean noOutputUntilEndOfInput) { | ||
| isNoOutputUntilEndOfInput = noOutputUntilEndOfInput; | ||
| } | ||
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| @Internal | ||
| public static class Builder { | ||
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| private boolean isNoOutputUntilEndOfInput = false; | ||
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| public Builder setNoOutputUntilEndOfInput(boolean isNoOutputUntilEndOfInput) { | ||
| this.isNoOutputUntilEndOfInput = isNoOutputUntilEndOfInput; | ||
| return this; | ||
| } | ||
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| public Attribute build() { | ||
| return new Attribute(isNoOutputUntilEndOfInput); | ||
| } | ||
| } | ||
| } |
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36 changes: 36 additions & 0 deletions
36
...-api/src/main/java/org/apache/flink/datastream/api/attribute/NoOutputUntilEndOfInput.java
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| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.datastream.api.attribute; | ||
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| import org.apache.flink.annotation.Experimental; | ||
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| import java.lang.annotation.ElementType; | ||
| import java.lang.annotation.Retention; | ||
| import java.lang.annotation.RetentionPolicy; | ||
| import java.lang.annotation.Target; | ||
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| /** | ||
| * {@link NoOutputUntilEndOfInput} indicates that the process function will only output records | ||
| * after all inputs are ended. If this annotation is applied to a process function with an unbounded | ||
| * source, a compilation error will occur. | ||
| */ | ||
| @Experimental | ||
| @Retention(RetentionPolicy.RUNTIME) | ||
| @Target(ElementType.TYPE) | ||
| public @interface NoOutputUntilEndOfInput {} |
36 changes: 36 additions & 0 deletions
36
...-datastream/src/main/java/org/apache/flink/datastream/impl/attribute/AttributeParser.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| /* | ||
| * 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. | ||
| */ | ||
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| package org.apache.flink.datastream.impl.attribute; | ||
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| import org.apache.flink.api.common.attribute.Attribute; | ||
| import org.apache.flink.datastream.api.attribute.NoOutputUntilEndOfInput; | ||
| import org.apache.flink.datastream.api.function.ProcessFunction; | ||
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| /** {@link AttributeParser} is used to parse {@link Attribute} from {@link ProcessFunction}. */ | ||
| public class AttributeParser { | ||
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| public static Attribute parseAttribute(ProcessFunction function) { | ||
| Class<? extends ProcessFunction> functionClass = function.getClass(); | ||
| Attribute.Builder attributeBuilder = new Attribute.Builder(); | ||
| if (functionClass.isAnnotationPresent(NoOutputUntilEndOfInput.class)) { | ||
| attributeBuilder.setNoOutputUntilEndOfInput(true); | ||
| } | ||
| return attributeBuilder.build(); | ||
| } | ||
| } |
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