/*
* Copyright 2014 the original author or authors.
*
* Licensed 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.springframework.batch.integration.x;
import java.util.HashMap;
import java.util.Map;
import org.springframework.batch.core.StepExecution;
import org.springframework.batch.core.partition.support.Partitioner;
import org.springframework.batch.item.ExecutionContext;
/**
* Takes the result of an (S)FTP Gateway LS (list of FileInfo) and creates a {@link StepExecution} for each file.
*
* Invokes the gateway flow via {@link Gateway}.
*
* @author Gary Russell
*/
public class RemoteFilePartitioner implements Partitioner {
private final Gateway gateway;
private final String remoteDirectory;
public RemoteFilePartitioner(Gateway gateway, String remoteDirectory) {
this.gateway = gateway;
this.remoteDirectory = remoteDirectory.endsWith("/") ? remoteDirectory : (remoteDirectory + "/");
}
@Override
public Map<String, ExecutionContext> partition(int gridSize) {
Map<String, ExecutionContext> partitions = new HashMap<String, ExecutionContext>();
String[] filesToFetch = gateway.filesToFetch(this.remoteDirectory);
for (String fileName : filesToFetch) {
ExecutionContext context = new ExecutionContext();
context.putString("filePath", remoteDirectory + fileName.trim());
partitions.put(fileName.trim(), context);
}
return partitions;
}
public interface Gateway {
String[] filesToFetch(String remoteDir);
}
}