Sources/ApacheBeam/Core/Fn/ObjectFn.swift

/*
 * 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.
 */

/// Allows the user to define a DoFn struct. Input and output streams along with parameterized values are dynamically
/// injected at bundle processing time. This allows for more complicated DoFns to be written.
public final class ObjectFn: SerializableFn {
    var doFn: DoFn

    public init(_ doFn: DoFn) {
        self.doFn = doFn
    }

    public func process(context: SerializableFnBundleContext, inputs _: [AnyPCollectionStream], outputs _: [AnyPCollectionStream]) async throws -> (String, String) {
        // TODO: Attach context to the doFn
        try await doFn.process()
        return (context.instruction, context.transform)
    }
}