/*
 * 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.shardingsphere.data.pipeline.core.task;

import lombok.Getter;
import lombok.RequiredArgsConstructor;
import lombok.ToString;
import org.apache.shardingsphere.data.pipeline.core.execute.PipelineExecuteEngine;
import org.apache.shardingsphere.data.pipeline.core.importer.Importer;
import org.apache.shardingsphere.data.pipeline.core.ingest.dumper.Dumper;
import org.apache.shardingsphere.data.pipeline.core.task.progress.IncrementalTaskProgress;

import java.util.Collection;
import java.util.LinkedList;
import java.util.concurrent.CompletableFuture;

/**
 * Incremental task.
 */
@RequiredArgsConstructor
@ToString(exclude = {"incrementalExecuteEngine", "dumper", "importers", "taskProgress"})
public final class IncrementalTask implements PipelineTask {
    
    @Getter
    private final String taskId;
    
    private final PipelineExecuteEngine incrementalExecuteEngine;
    
    private final Dumper dumper;
    
    private final Collection<Importer> importers;
    
    @Getter
    private final IncrementalTaskProgress taskProgress;
    
    @Override
    public Collection<CompletableFuture<?>> start() {
        taskProgress.getIncrementalTaskDelay().setLatestActiveTimeMillis(System.currentTimeMillis());
        Collection<CompletableFuture<?>> result = new LinkedList<>();
        synchronized (incrementalExecuteEngine) {
            result.add(incrementalExecuteEngine.submit(dumper, new TaskExecuteCallback(this)));
            importers.forEach(each -> result.add(incrementalExecuteEngine.submit(each, new TaskExecuteCallback(this))));
        }
        return result;
    }
    
    @Override
    public void stop() {
        dumper.stop();
        for (Importer each : importers) {
            each.stop();
        }
    }
    
    @Override
    public void close() {
    }
}
