/**
* Licensed to Cloudera, Inc. under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Cloudera, Inc. 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 com.cloudera.flume.handlers.debug;
import static org.junit.Assert.*;
import java.io.IOException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.junit.Test;
import com.cloudera.flume.conf.FlumeBuilder;
import com.cloudera.flume.conf.FlumeSpecException;
import com.cloudera.flume.conf.ReportTestingContext;
import com.cloudera.flume.core.Event;
import com.cloudera.flume.core.EventImpl;
import com.cloudera.flume.core.EventSink;
import com.cloudera.flume.reporter.ReportManager;
import com.cloudera.flume.reporter.aggregator.CounterSink;
/**
* Demonstrates that lazy open defers until append happens to actually open.
*/
public class TestLazyOpen {
public static final Logger LOG = LoggerFactory.getLogger(TestLazyOpen.class);
static class OpenInstanceCountingSink extends EventSink.Base {
int opened = 0;
int closed = 0;
@Override
public void append(Event e) throws IOException {
}
@Override
public void close() throws IOException {
closed++;
LOG.info("actually closed");
}
@Override
public void open() throws IOException {
opened++;
LOG.info("actually open happened now");
}
}
@Test
public void testLazyOpen() throws IOException {
OpenInstanceCountingSink snk = new OpenInstanceCountingSink();
LazyOpenDecorator<EventSink> lazy = new LazyOpenDecorator<EventSink>(snk);
lazy.open();
LOG.info("lazy decorator opened");
assertEquals(0, snk.opened);
LOG.info("appending");
Event e = new EventImpl("foo".getBytes());
lazy.append(e);
assertEquals(1, snk.opened);
LOG.info("done");
}
@Test
public void testLazyClosed() throws IOException {
OpenInstanceCountingSink snk = new OpenInstanceCountingSink();
LazyOpenDecorator<EventSink> lazy = new LazyOpenDecorator<EventSink>(snk);
lazy.open();
lazy.close();
LOG.info("lazy decorator opened");
assertEquals(0, snk.closed);
LOG.info("appending");
Event e = new EventImpl("foo".getBytes());
lazy.open();
lazy.append(e);
lazy.close();
assertEquals(1, snk.opened);
LOG.info("done");
}
/**
* Tests the lazy open through another mechanism, and tests the builder
*/
@Test
public void testLazyOpenBuild() throws IOException, FlumeSpecException {
EventSink snk = FlumeBuilder.buildSink(new ReportTestingContext(),
"{ lazyOpen => counter(\"count\") } ");
CounterSink cnt = (CounterSink) ReportManager.get().getReportable("count");
boolean ok = false;
Event e = new EventImpl("event".getBytes());
snk.open();
try {
cnt.append(e);
} catch (Exception ex) {
ok = true;
// should be thrown because not actually open
}
assertTrue(ok);
snk.append(e);
assertEquals(1, cnt.getCount());
snk.close();
}
}