kafka NamedInternal 源码

kafka NamedInternal 代码

文件路径：/streams/src/main/java/org/apache/kafka/streams/kstream/internals/NamedInternal.java

/*
 * 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.kafka.streams.kstream.internals;

import org.apache.kafka.streams.kstream.Named;

public class NamedInternal extends Named {

    public static NamedInternal empty() {
        return new NamedInternal((String) null);
    }

    public static NamedInternal with(final String name) {
        return new NamedInternal(name);
    }

    /**
     * Creates a new {@link NamedInternal} instance.
     *
     * @param internal  the internal name.
     */
    NamedInternal(final Named internal) {
        super(internal);
    }

    /**
     * Creates a new {@link NamedInternal} instance.
     *
     * @param internal the internal name.
     */
    NamedInternal(final String internal) {
        super(internal);
    }

    /**
     * @return a string name.
     */
    public String name() {
        return name;
    }

    @Override
    public NamedInternal withName(final String name) {
        return new NamedInternal(name);
    }
    
    String suffixWithOrElseGet(final String suffix, final String other) {
        if (name != null) {
            return name + suffix;
        } else {
            return other;
        }
    }

    String suffixWithOrElseGet(final String suffix, final InternalNameProvider provider, final String prefix) {
        // We actually do not need to generate processor names for operation if a name is specified.
        // But before returning, we still need to burn index for the operation to keep topology backward compatibility.
        if (name != null) {
            provider.newProcessorName(prefix);

            final String suffixed = name + suffix;
            // Re-validate generated name as suffixed string could be too large.
            Named.validate(suffixed);

            return suffixed;
        } else {
            return provider.newProcessorName(prefix);
        }
    }

    String orElseGenerateWithPrefix(final InternalNameProvider provider, final String prefix) {
        // We actually do not need to generate processor names for operation if a name is specified.
        // But before returning, we still need to burn index for the operation to keep topology backward compatibility.
        if (name != null) {
            provider.newProcessorName(prefix);
            return name;
        }  else {
            return provider.newProcessorName(prefix);
        }
    }

}

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