/*
* 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.nifi.toolkit.s2s;
import org.apache.commons.io.IOUtils;
import org.apache.nifi.remote.Transaction;
import org.apache.nifi.remote.TransactionCompletion;
import org.apache.nifi.remote.TransferDirection;
import org.apache.nifi.remote.client.SiteToSiteClient;
import org.apache.nifi.remote.protocol.DataPacket;
import org.codehaus.jackson.JsonFactory;
import org.codehaus.jackson.JsonGenerator;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.Map;
/**
* Class that will print received DataPackets to output
*/
public class SiteToSiteReceiver {
private final SiteToSiteClient siteToSiteClient;
private final OutputStream output;
public SiteToSiteReceiver(SiteToSiteClient siteToSiteClient, OutputStream output) {
this.siteToSiteClient = siteToSiteClient;
this.output = output;
}
public TransactionCompletion receiveFiles() throws IOException {
Transaction transaction = siteToSiteClient.createTransaction(TransferDirection.RECEIVE);
JsonGenerator jsonGenerator = new JsonFactory().createJsonGenerator(output);
jsonGenerator.writeStartArray();
DataPacket dataPacket;
while ((dataPacket = transaction.receive()) != null) {
jsonGenerator.writeStartObject();
jsonGenerator.writeFieldName("attributes");
jsonGenerator.writeStartObject();
Map<String, String> attributes = dataPacket.getAttributes();
if (attributes != null) {
for (Map.Entry<String, String> stringStringEntry : attributes.entrySet()) {
jsonGenerator.writeStringField(stringStringEntry.getKey(), stringStringEntry.getValue());
}
}
jsonGenerator.writeEndObject();
InputStream data = dataPacket.getData();
if (data != null) {
jsonGenerator.writeBinaryField("data", IOUtils.toByteArray(data));
}
jsonGenerator.writeEndObject();
}
jsonGenerator.writeEndArray();
jsonGenerator.close();
transaction.confirm();
return transaction.complete();
}
}