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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
/*
* 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.geode.cache.client.internal;
import java.util.Arrays;
import org.apache.geode.internal.Version;
import org.apache.geode.internal.cache.tier.MessageType;
import org.apache.geode.internal.cache.tier.sockets.Message;
import org.apache.geode.internal.cache.tier.sockets.ChunkedMessage;
import org.apache.geode.internal.cache.tier.sockets.ObjectPartList;
import org.apache.geode.internal.cache.tier.sockets.Part;
import org.apache.geode.cache.query.SelectResults;
import org.apache.geode.cache.query.types.CollectionType;
import org.apache.geode.cache.query.types.ObjectType;
import org.apache.geode.cache.query.internal.QueryUtils;
import org.apache.geode.cache.query.internal.StructImpl;
import org.apache.geode.cache.query.internal.types.StructTypeImpl;
import org.apache.geode.cache.query.internal.types.TypeUtils;
import org.apache.geode.SerializationException;
import org.apache.geode.cache.client.ServerOperationException;
/**
* Does a region query on a server
*
* @since GemFire 5.7
*/
public class QueryOp {
/**
* Does a region query on a server using connections from the given pool to communicate with the
* server.
*
* @param pool the pool to use to communicate with the server.
* @param queryPredicate A query language boolean query predicate
* @return A SelectResults containing the values that match the
* queryPredicate.
*/
public static SelectResults execute(ExecutablePool pool, String queryPredicate,
Object[] queryParams) {
AbstractOp op = null;
if (queryParams != null && queryParams.length > 0) {
op = new QueryOpImpl(queryPredicate, queryParams);
} else {
op = new QueryOpImpl(queryPredicate);
}
return (SelectResults) pool.execute(op);
}
private QueryOp() {
// no instances allowed
}
/**
* Note: this class is extended by CreateCQWithIROpImpl.
*/
protected static class QueryOpImpl extends AbstractOp {
/**
* @throws org.apache.geode.SerializationException if serialization fails
*/
public QueryOpImpl(String queryPredicate) {
super(MessageType.QUERY, 1);
getMessage().addStringPart(queryPredicate);
}
/**
* @throws org.apache.geode.SerializationException if serialization fails
*/
public QueryOpImpl(String queryPredicate, Object[] queryParams) {
super(MessageType.QUERY_WITH_PARAMETERS, 2 + queryParams.length);
getMessage().addStringPart(queryPredicate);
getMessage().addIntPart(queryParams.length);
for (Object param : queryParams) {
getMessage().addObjPart(param);
}
}
/**
* This constructor is used by our subclass CreateCQWithIROpImpl
*
* @throws org.apache.geode.SerializationException if serialization fails
*/
protected QueryOpImpl(int msgType, int numParts) {
super(msgType, numParts);
}
@Override
protected Message createResponseMessage() {
return new ChunkedMessage(2, Version.CURRENT);
}
@Override
protected Object processResponse(Message msg) throws Exception {
final SelectResults[] resultRef = new SelectResults[1];
final Exception[] exceptionRef = new Exception[1];
ChunkHandler ch = new ChunkHandler() {
public void handle(ChunkedMessage cm) throws Exception {
Part collectionTypePart = cm.getPart(0);
Object o = collectionTypePart.getObject();
if (o instanceof Throwable) {
String s = "While performing a remote " + getOpName();
exceptionRef[0] = new ServerOperationException(s, (Throwable) o);
return;
}
CollectionType collectionType = (CollectionType) o;
Part resultPart = cm.getPart(1);
Object queryResult = null;
try {
queryResult = resultPart.getObject();
} catch (Exception e) {
String s = "While deserializing " + getOpName() + " result";
exceptionRef[0] = new SerializationException(s, e);
return;
}
if (queryResult instanceof Throwable) {
String s = "While performing a remote " + getOpName();
exceptionRef[0] = new ServerOperationException(s, (Throwable) queryResult);
return;
} else if (queryResult instanceof Integer) {
// Create the appropriate SelectResults instance if necessary
if (resultRef[0] == null) {
resultRef[0] = QueryUtils.getEmptySelectResults(TypeUtils.OBJECT_TYPE, null);
}
resultRef[0].add(queryResult);
} else { // typical query result
// Create the appropriate SelectResults instance if necessary
if (resultRef[0] == null) {
resultRef[0] = QueryUtils.getEmptySelectResults(collectionType, null);
}
SelectResults selectResults = resultRef[0];
ObjectType objectType = collectionType.getElementType();
Object[] resultArray;
// for select * queries, the serialized object byte arrays are
// returned as part of ObjectPartList
boolean isObjectPartList = false;
if (queryResult instanceof ObjectPartList) {
isObjectPartList = true;
resultArray = ((ObjectPartList) queryResult).getObjects().toArray();
} else {
// Add the results to the SelectResults
resultArray = (Object[]) queryResult;
}
if (objectType.isStructType()) {
for (int i = 0; i < resultArray.length; i++) {
if (isObjectPartList) {
selectResults.add(new StructImpl((StructTypeImpl) objectType,
((ObjectPartList) resultArray[i]).getObjects().toArray()));
} else {
selectResults
.add(new StructImpl((StructTypeImpl) objectType, (Object[]) resultArray[i]));
}
}
} else {
selectResults.addAll(Arrays.asList(resultArray));
}
}
}
};
processChunkedResponse((ChunkedMessage) msg, getOpName(), ch);
if (exceptionRef[0] != null) {
throw exceptionRef[0];
} else {
return resultRef[0];
}
}
protected String getOpName() {
return "query";
}
@Override
protected boolean isErrorResponse(int msgType) {
return msgType == MessageType.QUERY_DATA_ERROR || msgType == MessageType.CQDATAERROR_MSG_TYPE
|| msgType == MessageType.CQ_EXCEPTION_TYPE;
}
@Override
protected long startAttempt(ConnectionStats stats) {
return stats.startQuery();
}
@Override
protected void endSendAttempt(ConnectionStats stats, long start) {
stats.endQuerySend(start, hasFailed());
}
@Override
protected void endAttempt(ConnectionStats stats, long start) {
stats.endQuery(start, hasTimedOut(), hasFailed());
}
}
}