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ActiveMQ example source code file (PageFileTest.java)

This example ActiveMQ source code file (PageFileTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - ActiveMQ tags/keywords

datainputstream, dataoutputstream, file, hashset, hashset, io, ioexception, page, page, pagefile, pagefile, string, string, test, transaction, util

The ActiveMQ PageFileTest.java source code

/**
 * 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.kahadb.page;

import java.io.DataInputStream;
import java.io.DataOutputStream;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.util.HashSet;

import org.apache.kahadb.util.StringMarshaller;

import junit.framework.TestCase;

public class PageFileTest extends TestCase {

    public void testCRUD() throws IOException {

        PageFile pf = new PageFile(new File("target/test-data"), getName());
        pf.delete();
        pf.load();

        HashSet<String> expected = new HashSet();

        // Insert some data into the page file.
        Transaction tx = pf.tx();
        for (int i = 0; i < 100; i++) {
            Page<String> page = tx.allocate();
            assertEquals(Page.PAGE_FREE_TYPE, page.getType());

            String t = "page:" + i;
            expected.add(t);
            page.set(t);
            tx.store(page, StringMarshaller.INSTANCE, false);
            tx.commit();
        }

        // Reload it...
        pf.unload();
        pf.load();
        tx = pf.tx();

        // Iterate it to make sure they are still there..
        HashSet<String> actual = new HashSet();
        for (Page<String> page : tx) {
            tx.load(page, StringMarshaller.INSTANCE);
            actual.add(page.get());
        }
        assertEquals(expected, actual);

        // Remove the odd records..
        for (int i = 0; i < 100; i++) {
            if (i % 2 == 0) {
                break;
            }
            String t = "page:" + i;
            expected.remove(t);
        }
        for (Page<String> page : tx) {
            tx.load(page, StringMarshaller.INSTANCE);
            if (!expected.contains(page.get())) {
                tx.free(page);
            }
        }
        tx.commit();

        // Reload it...
        pf.unload();
        pf.load();
        tx = pf.tx();

        // Iterate it to make sure the even records are still there..
        actual.clear();
        for (Page<String> page : tx) {
            tx.load(page, StringMarshaller.INSTANCE);
            actual.add((String)page.get());
        }
        assertEquals(expected, actual);

        // Update the records...
        HashSet<String> t = expected;
        expected = new HashSet<String>();
        for (String s : t) {
            expected.add(s + ":updated");
        }
        for (Page<String> page : tx) {
            tx.load(page, StringMarshaller.INSTANCE);
            page.set(page.get() + ":updated");
            tx.store(page, StringMarshaller.INSTANCE, false);
        }
        tx.commit();

        // Reload it...
        pf.unload();
        pf.load();
        tx = pf.tx();

        // Iterate it to make sure the updated records are still there..
        actual.clear();
        for (Page<String> page : tx) {
            tx.load(page, StringMarshaller.INSTANCE);
            actual.add(page.get());
        }
        assertEquals(expected, actual);

        pf.unload();
    }

    public void testStreams() throws IOException {

        PageFile pf = new PageFile(new File("target/test-data"), getName());
        pf.delete();
        pf.load();

        Transaction tx = pf.tx();
        Page page = tx.allocate();
        tx.commit();

        OutputStream pos = tx.openOutputStream(page, true);
        DataOutputStream os = new DataOutputStream(pos);
        for (int i = 0; i < 10000; i++) {
            os.writeUTF("Test string:" + i);
        }

        os.close();
        tx.commit();

        // Reload the page file.
        pf.unload();
        pf.load();
        tx = pf.tx();

        InputStream pis = tx.openInputStream(page);
        DataInputStream is = new DataInputStream(pis);
        for (int i = 0; i < 10000; i++) {
            assertEquals("Test string:" + i, is.readUTF());
        }
        assertEquals(-1, is.read());
        is.close();

        pf.unload();
    }

    public void testAddRollback() throws IOException {

        PageFile pf = new PageFile(new File("target/test-data"), getName());
        pf.delete();
        pf.load();

        HashSet<String> expected = new HashSet();

        // Insert some data into the page file.
        Transaction tx = pf.tx();
        for (int i = 0; i < 100; i++) {
            Page<String> page = tx.allocate();
            assertEquals(Page.PAGE_FREE_TYPE, page.getType());

            String t = "page:" + i;
            page.set(t);
            tx.store(page, StringMarshaller.INSTANCE, false);

            // Rollback every other insert.
            if (i % 2 == 0) {
                expected.add(t);
                tx.commit();
            } else {
                tx.rollback();
            }

        }

        // Reload it...
        pf.unload();
        pf.load();
        tx = pf.tx();

        // Iterate it to make sure they are still there..
        HashSet<String> actual = new HashSet();
        for (Page<String> page : tx) {
            tx.load(page, StringMarshaller.INSTANCE);
            actual.add(page.get());
        }
        assertEquals(expected, actual);
    }
}

Other ActiveMQ examples (source code examples)

Here is a short list of links related to this ActiveMQ PageFileTest.java source code file:

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