FileBasedPersistenceTest.java

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 *
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package etm.core.aggregation.persistence;

import etm.core.aggregation.persistence.FileSystemPersistenceBackend;
import etm.core.aggregation.persistence.PersistentRootAggregator;
import etm.core.monitor.EtmMonitor;
import etm.core.monitor.EtmPoint;
import etm.core.monitor.NestedMonitor;
import etm.core.renderer.SimpleTextRenderer;
import junit.framework.TestCase;

import java.io.File;
import java.io.StringWriter;
import java.util.Date;

/**
 *
 * Tests store and load to file persistence for flat and nested monitors.
 * @author void.fm
 * @version $Revision:96 $
 */
public class FileBasedPersistenceTest extends TestCase {

  private File file;

  protected void setUp() throws Exception {
    super.setUp();
    file = new File(System.getProperty("java.io.tmpdir"), "junit-ser");
    if (file.exists()) {
      file.delete();
    }
  }

  protected void tearDown() throws Exception {
    if (file.exists()) {
      file.delete();
    }
  }

  public void testPersistence() {
    FileSystemPersistenceBackend backend = new FileSystemPersistenceBackend();
    backend.setFilename("junit-ser");

    PersistentRootAggregator memoryAggregator = new PersistentRootAggregator();
    memoryAggregator.setPersistenceBackend(backend);
    EtmMonitor memoryMonitor = new NestedMonitor(memoryAggregator);
    memoryMonitor.start();

    EtmPoint point = memoryMonitor.createPoint("test");
    point.collect();

    StringWriter memoryWriter = new StringWriter();
    SimpleTextRenderer memoryRenderer = new SimpleTextRenderer(memoryWriter);
    memoryMonitor.render(memoryRenderer);

    memoryMonitor.stop();

    assertTrue(file.exists());
    Date startDate = memoryMonitor.getMetaData().getStartTime();
    Date lastReset = memoryMonitor.getMetaData().getLastResetTime();

    // create new monitor and compare loaded details
    PersistentRootAggregator persistentStateAggregator = new PersistentRootAggregator();
    persistentStateAggregator.setPersistenceBackend(backend);
    EtmMonitor persistentStateMonitor = new NestedMonitor(persistentStateAggregator);
    persistentStateMonitor.start();

    assertEquals(startDate.getTime(), persistentStateMonitor.getMetaData().getStartTime().getTime());
    assertEquals(lastReset.getTime(), persistentStateMonitor.getMetaData().getLastResetTime().getTime());

    StringWriter persistentWriter = new StringWriter();
    SimpleTextRenderer persistentRenderer = new SimpleTextRenderer(persistentWriter);
    persistentStateMonitor.render(persistentRenderer);

    assertEquals(memoryWriter.toString(), persistentWriter.toString());

    persistentStateMonitor.stop();
  }
}