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CouchbaseClient.java
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Sun, Jun 23, 03:45

CouchbaseClient.java
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/**
* Copyright (c) 2013 Yahoo! Inc. All rights reserved.
*
* 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. See accompanying
* LICENSE file.
*/
package com.yahoo.ycsb.db;
import com.fasterxml.jackson.core.JsonFactory;
import com.fasterxml.jackson.core.JsonGenerator;
import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.node.ObjectNode;
import com.yahoo.ycsb.ByteIterator;
import com.yahoo.ycsb.DB;
import com.yahoo.ycsb.DBException;
import com.yahoo.ycsb.StringByteIterator;
import net.spy.memcached.PersistTo;
import net.spy.memcached.ReplicateTo;
import net.spy.memcached.internal.OperationFuture;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.io.StringWriter;
import java.io.Writer;
import java.net.URI;
import java.util.*;
/**
* A class that wraps the CouchbaseClient to allow it to be interfaced with YCSB.
* This class extends {@link DB} and implements the database interface used by YCSB client.
*
* <p> The following options must be passed when using this database client.
*
* <ul>
* <li><b>couchbase.url=http://127.0.0.1:8091/pools</b> The connection URL from one server.</li>
* <li><b>couchbase.bucket=default</b> The bucket name to use./li>
* <li><b>couchbase.password=</b> The password of the bucket.</li>
* <li><b>couchbase.checkFutures=true</b> If the futures should be inspected (makes ops sync).</li>
* <li><b>couchbase.persistTo=0</b> Observe Persistence ("PersistTo" constraint)</li>
* <li><b>couchbase.replicateTo=0</b> Observe Replication ("ReplicateTo" constraint)</li>
* <li><b>couchbase.json=true</b> Use json or java serialization as target format.</li>
* </ul>
*
* @author Michael Nitschinger
*/
public class CouchbaseClient extends DB {
public static final String URL_PROPERTY = "couchbase.url";
public static final String BUCKET_PROPERTY = "couchbase.bucket";
public static final String PASSWORD_PROPERTY = "couchbase.password";
public static final String CHECKF_PROPERTY = "couchbase.checkFutures";
public static final String PERSIST_PROPERTY = "couchbase.persistTo";
public static final String REPLICATE_PROPERTY = "couchbase.replicateTo";
public static final String JSON_PROPERTY = "couchbase.json";
public static final int OK = 0;
public static final int FAILURE = 1;
protected static final ObjectMapper JSON_MAPPER = new ObjectMapper();
private com.couchbase.client.CouchbaseClient client;
private PersistTo persistTo;
private ReplicateTo replicateTo;
private boolean checkFutures;
private boolean useJson;
private final Logger log = LoggerFactory.getLogger(getClass());
@Override
public void init() throws DBException {
Properties props = getProperties();
String url = props.getProperty(URL_PROPERTY, "http://127.0.0.1:8091/pools");
String bucket = props.getProperty(BUCKET_PROPERTY, "default");
String password = props.getProperty(PASSWORD_PROPERTY, "");
checkFutures = props.getProperty(CHECKF_PROPERTY, "true").equals("true");
useJson = props.getProperty(JSON_PROPERTY, "true").equals("true");
persistTo = parsePersistTo(props.getProperty(PERSIST_PROPERTY, "0"));
replicateTo = parseReplicateTo(props.getProperty(REPLICATE_PROPERTY, "0"));
Properties systemProperties = System.getProperties();
systemProperties.put("net.spy.log.LoggerImpl", "net.spy.memcached.compat.log.SLF4JLogger");
System.setProperties(systemProperties);
try {
client = new com.couchbase.client.CouchbaseClient(
Arrays.asList(new URI(url)),
bucket,
password
);
} catch (Exception e) {
throw new DBException("Could not create CouchbaseClient object.", e);
}
}
/**
* Parse the replicate property into the correct enum.
*
* @param property the stringified property value.
* @throws DBException if parsing the property did fail.
* @return the correct enum.
*/
private ReplicateTo parseReplicateTo(final String property) throws DBException {
int value = Integer.parseInt(property);
switch (value) {
case 0: return ReplicateTo.ZERO;
case 1: return ReplicateTo.ONE;
case 2: return ReplicateTo.TWO;
case 3: return ReplicateTo.THREE;
default:
throw new DBException(REPLICATE_PROPERTY + " must be between 0 and 3");
}
}
/**
* Parse the persist property into the correct enum.
*
* @param property the stringified property value.
* @throws DBException if parsing the property did fail.
* @return the correct enum.
*/
private PersistTo parsePersistTo(final String property) throws DBException {
int value = Integer.parseInt(property);
switch (value) {
case 0: return PersistTo.ZERO;
case 1: return PersistTo.ONE;
case 2: return PersistTo.TWO;
case 3: return PersistTo.THREE;
case 4: return PersistTo.FOUR;
default:
throw new DBException(PERSIST_PROPERTY + " must be between 0 and 4");
}
}
/**
* Shutdown the client.
*/
@Override
public void cleanup() {
client.shutdown();
}
@Override
public int read(final String table, final String key, final Set<String> fields,
final HashMap<String, ByteIterator> result) {
String formattedKey = formatKey(table, key);
try {
Object loaded = client.get(formattedKey);
if (loaded == null) {
return FAILURE;
}
decode(loaded, fields, result);
return OK;
} catch (Exception e) {
if (log.isErrorEnabled()) {
log.error("Could not read value for key " + formattedKey, e);
}
return FAILURE;
}
}
/**
* Scan is currently not implemented.
*
* @param table The name of the table
* @param startkey The record key of the first record to read.
* @param recordcount The number of records to read
* @param fields The list of fields to read, or null for all of them
* @param result A Vector of HashMaps, where each HashMap is a set field/value pairs for one record
* @return FAILURE, because not implemented yet.
*/
@Override
public int scan(final String table, final String startkey, final int recordcount,
final Set<String> fields, final Vector<HashMap<String, ByteIterator>> result) {
return FAILURE;
}
@Override
public int update(final String table, final String key, final HashMap<String, ByteIterator> values) {
String formattedKey = formatKey(table, key);
try {
final OperationFuture<Boolean> future = client.replace(
formattedKey,
encode(values),
persistTo,
replicateTo
);
return checkFutureStatus(future);
} catch (Exception e) {
if (log.isErrorEnabled()) {
log.error("Could not update value for key " + formattedKey, e);
}
return FAILURE;
}
}
@Override
public int insert(final String table, final String key, final HashMap<String, ByteIterator> values) {
String formattedKey = formatKey(table, key);
try {
final OperationFuture<Boolean> future = client.add(
formattedKey,
encode(values),
persistTo,
replicateTo
);
return checkFutureStatus(future);
} catch (Exception e) {
if (log.isErrorEnabled()) {
log.error("Could not insert value for key " + formattedKey, e);
}
return FAILURE;
}
}
@Override
public int delete(final String table, final String key) {
String formattedKey = formatKey(table, key);
try {
final OperationFuture<Boolean> future = client.delete(formattedKey, persistTo, replicateTo);
return checkFutureStatus(future);
} catch (Exception e) {
if (log.isErrorEnabled()) {
log.error("Could not delete value for key " + formattedKey, e);
}
return FAILURE;
}
}
/**
* Prefix the key with the given prefix, to establish a unique namespace.
*
* @param prefix the prefix to use.
* @param key the actual key.
* @return the formatted and prefixed key.
*/
private String formatKey(final String prefix, final String key) {
return prefix + ":" + key;
}
/**
* Wrapper method that either inspects the future or not.
*
* @param future the future to potentially verify.
* @return the status of the future result.
*/
private int checkFutureStatus(final OperationFuture<?> future) {
if (checkFutures) {
return future.getStatus().isSuccess() ? OK : FAILURE;
} else {
return OK;
}
}
/**
* Decode the object from server into the storable result.
*
* @param source the loaded object.
* @param fields the fields to check.
* @param dest the result passed back to the ycsb core.
*/
private void decode(final Object source, final Set<String> fields,
final HashMap<String, ByteIterator> dest) {
if (useJson) {
try {
JsonNode json = JSON_MAPPER.readTree((String) source);
boolean checkFields = fields != null && fields.size() > 0;
for (Iterator<Map.Entry<String, JsonNode>> jsonFields = json.fields(); jsonFields.hasNext();) {
Map.Entry<String, JsonNode> jsonField = jsonFields.next();
String name = jsonField.getKey();
if (checkFields && fields.contains(name)) {
continue;
}
JsonNode jsonValue = jsonField.getValue();
if (jsonValue != null && !jsonValue.isNull()) {
dest.put(name, new StringByteIterator(jsonValue.asText()));
}
}
} catch (Exception e) {
throw new RuntimeException("Could not decode JSON");
}
} else {
HashMap<String, String> converted = (HashMap<String, String>) source;
for (Map.Entry<String, String> entry : converted.entrySet()) {
dest.put(entry.getKey(), new StringByteIterator(entry.getValue()));
}
}
}
/**
* Encode the object for couchbase storage.
*
* @param source the source value.
* @return the storable object.
*/
private Object encode(final HashMap<String, ByteIterator> source) {
HashMap<String, String> stringMap = StringByteIterator.getStringMap(source);
if (!useJson) {
return stringMap;
}
ObjectNode node = JSON_MAPPER.createObjectNode();
for (Map.Entry<String, String> pair : stringMap.entrySet()) {
node.put(pair.getKey(), pair.getValue());
}
JsonFactory jsonFactory = new JsonFactory();
Writer writer = new StringWriter();
try {
JsonGenerator jsonGenerator = jsonFactory.createGenerator(writer);
JSON_MAPPER.writeTree(jsonGenerator, node);
} catch (Exception e) {
throw new RuntimeException("Could not encode JSON value");
}
return writer.toString();
}
}

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