com.marklogic.client.example.cookbook.MultiStatementTransaction Maven / Gradle / Ivy

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/*
 * Copyright 2012-2016 MarkLogic Corporation
 *
 * 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 com.marklogic.client.example.cookbook;

import java.io.File;
import java.io.IOException;
import java.io.InputStream;

import com.marklogic.client.DatabaseClient;
import com.marklogic.client.DatabaseClientFactory;
import com.marklogic.client.Transaction;
import com.marklogic.client.document.XMLDocumentManager;
import com.marklogic.client.example.cookbook.Util.ExampleProperties;
import com.marklogic.client.io.InputStreamHandle;

/**
 * MultiStatementTransaction illustrates how to open a transaction, execute
 * multiple statements under the transaction, and commit the transaction.
 */
public class MultiStatementTransaction {
	public static void main(String[] args) throws IOException {
		run(Util.loadProperties());
	}

	public static void run(ExampleProperties props) throws IOException {
		System.out.println("example: "+MultiStatementTransaction.class.getName());

		String beforeFilename = "flipper.xml";
		String afterFilename  = "flapped.xml";

		// create the client
		DatabaseClient client = DatabaseClientFactory.newClient(
				props.host, props.port, props.writerUser, props.writerPassword,
				props.authType);

		// create a manager for XML documents
		XMLDocumentManager docMgr = client.newXMLDocumentManager();

		// create an identifier for the document before the move
		String beforeDocId = "/example/"+beforeFilename;

		// create an identifier for the document after the move
		String afterDocId = "/example/"+afterFilename;

		setUpExample(docMgr, beforeDocId, beforeFilename);

		// start the transaction
		Transaction transaction = client.openTransaction();

		// create a handle to receive the document content
		InputStreamHandle handle = new InputStreamHandle();

		// read the document with the old id
		docMgr.read(beforeDocId, handle, transaction);

		// write the document with the new id
		docMgr.write(afterDocId, handle, transaction);

		// delete the document with the old id
		docMgr.delete(beforeDocId, transaction);

		// commit the transaction for the move operation
		transaction.commit();

		System.out.println("Moved document from "+beforeFilename+" to "+afterFilename);

		tearDownExample(docMgr, afterDocId);

		// release the client
		client.release();
	}

	// set up by writing document content for the example to read
	public static void setUpExample(XMLDocumentManager docMgr, String docId, String filename) throws IOException {
		InputStream docStream = Util.openStream("data"+File.separator+filename);
		if (docStream == null)
			throw new IOException("Could not read document example");

		InputStreamHandle handle = new InputStreamHandle();
		handle.set(docStream);

		docMgr.write(docId, handle);
	}

	// clean up by deleting the document read by the example
	public static void tearDownExample(XMLDocumentManager docMgr, String docId) {
		docMgr.delete(docId);
	}
}