/*
* 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.jackrabbit.oak.plugins.document.mongo;
import org.apache.jackrabbit.oak.plugins.document.AbstractMongoConnectionTest;
import org.apache.jackrabbit.oak.plugins.document.Collection;
import org.apache.jackrabbit.oak.plugins.document.Document;
import org.apache.jackrabbit.oak.plugins.document.DocumentMK;
import org.apache.jackrabbit.oak.plugins.document.DocumentStoreException;
import org.apache.jackrabbit.oak.plugins.document.MongoUtils;
import org.apache.jackrabbit.oak.plugins.document.NodeDocument;
import org.apache.jackrabbit.oak.plugins.document.util.Utils;
import org.junit.Test;
import com.mongodb.DB;
import com.mongodb.MongoException;
import static org.apache.jackrabbit.oak.plugins.document.Collection.NODES;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.fail;
/**
* Tests retry logic in MongoDocumentStore (OAK-1641).
*/
public class RetryReadIT extends AbstractMongoConnectionTest {
private TestStore store;
@Override
public void setUpConnection() throws Exception {
mongoConnection = MongoUtils.getConnection();
MongoUtils.dropCollections(mongoConnection.getDB());
DocumentMK.Builder builder = new DocumentMK.Builder();
builder.clock(getTestClock());
store = new TestStore(mongoConnection.getDB(), builder);
mk = builder.setDocumentStore(store).open();
}
@Test
public void retry() {
// must survive two consecutive failures. -> 2 retries
store.failRead = 2;
NodeDocument doc = store.find(NODES, Utils.getIdFromPath("/foo"));
assertNull(doc);
// previous result is cached and will not fail
store.failRead = 3;
doc = store.find(NODES, Utils.getIdFromPath("/foo"));
assertNull(doc);
// must fail with three consecutive failures on unknown path
try {
store.find(NODES, Utils.getIdFromPath("/bar"));
fail("must fail with DocumentStoreException");
} catch (DocumentStoreException e) {
// expected
}
}
private static class TestStore extends MongoDocumentStore {
private int failRead = 0;
public TestStore(DB db, DocumentMK.Builder builder) {
super(db, builder);
}
@Override
protected <T extends Document> T findUncached(Collection<T> collection,
String key,
DocumentReadPreference docReadPref) {
if (failRead > 0) {
failRead--;
throw new MongoException("read failed");
}
return super.findUncached(collection, key, docReadPref);
}
}
}