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/*
* 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.calcite.avatica.remote;
import org.apache.calcite.avatica.ColumnMetaData;
import org.apache.calcite.avatica.Meta;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.io.StringWriter;
import java.util.ArrayList;
import java.util.List;
/**
* Implementation of {@link org.apache.calcite.avatica.remote.Service}
* that encodes requests and responses as JSON.
*/
public abstract class JsonService implements Service {
protected static final ObjectMapper MAPPER;
static {
MAPPER = new ObjectMapper();
MAPPER.configure(JsonParser.Feature.ALLOW_UNQUOTED_FIELD_NAMES, true);
MAPPER.configure(JsonParser.Feature.ALLOW_SINGLE_QUOTES, true);
}
public JsonService() {
}
/** Derived class should implement this method to transport requests and
* responses to and from the peer service. */
public abstract String apply(String request);
/** Modifies a signature, changing the representation of numeric columns
* within it. This deals with the fact that JSON transmits a small long value,
* or a float which is a whole number, as an integer. Thus the accessors need
* be prepared to accept any numeric type. */
private static Meta.Signature finagle(Meta.Signature signature) {
final List columns = new ArrayList<>();
int changeCount = 0;
for (ColumnMetaData column : signature.columns) {
switch (column.type.rep) {
case BYTE:
case PRIMITIVE_BYTE:
case DOUBLE:
case PRIMITIVE_DOUBLE:
case FLOAT:
case PRIMITIVE_FLOAT:
case INTEGER:
case PRIMITIVE_INT:
case SHORT:
case PRIMITIVE_SHORT:
case LONG:
case PRIMITIVE_LONG:
column = column.setRep(ColumnMetaData.Rep.OBJECT);
++changeCount;
}
columns.add(column);
}
if (changeCount == 0) {
return signature;
}
return new Meta.Signature(columns, signature.sql,
signature.parameters, signature.internalParameters,
signature.cursorFactory);
}
private static PrepareResponse finagle(PrepareResponse response) {
final Meta.StatementHandle statement = finagle(response.statement);
if (statement == response.statement) {
return response;
}
return new PrepareResponse(statement);
}
private static Meta.StatementHandle finagle(Meta.StatementHandle h) {
final Meta.Signature signature = finagle(h.signature);
if (signature == h.signature) {
return h;
}
return new Meta.StatementHandle(h.connectionId, h.id, signature);
}
private static ResultSetResponse finagle(ResultSetResponse r) {
if (r.updateCount != -1) {
assert r.signature == null;
return r;
}
final Meta.Signature signature = finagle(r.signature);
if (signature == r.signature) {
return r;
}
return new ResultSetResponse(r.connectionId, r.statementId, r.ownStatement,
signature, r.firstFrame, r.updateCount);
}
private static ExecuteResponse finagle(ExecuteResponse r) {
final List results = new ArrayList<>();
int changeCount = 0;
for (ResultSetResponse result : r.results) {
ResultSetResponse result2 = finagle(result);
if (result2 != result) {
++changeCount;
}
results.add(result2);
}
if (changeCount == 0) {
return r;
}
return new ExecuteResponse(results);
}
//@VisibleForTesting
protected static T decode(String response, Class valueType)
throws IOException {
return MAPPER.readValue(response, valueType);
}
//@VisibleForTesting
protected static String encode(T request) throws IOException {
final StringWriter w = new StringWriter();
MAPPER.writeValue(w, request);
return w.toString();
}
protected RuntimeException handle(IOException e) {
return new RuntimeException(e);
}
public ResultSetResponse apply(CatalogsRequest request) {
try {
return decode(apply(encode(request)), ResultSetResponse.class);
} catch (IOException e) {
throw handle(e);
}
}
public ResultSetResponse apply(SchemasRequest request) {
try {
return decode(apply(encode(request)), ResultSetResponse.class);
} catch (IOException e) {
throw handle(e);
}
}
public ResultSetResponse apply(TablesRequest request) {
try {
return decode(apply(encode(request)), ResultSetResponse.class);
} catch (IOException e) {
throw handle(e);
}
}
public ResultSetResponse apply(TableTypesRequest request) {
try {
return decode(apply(encode(request)), ResultSetResponse.class);
} catch (IOException e) {
throw handle(e);
}
}
public ResultSetResponse apply(ColumnsRequest request) {
try {
return decode(apply(encode(request)), ResultSetResponse.class);
} catch (IOException e) {
throw handle(e);
}
}
public PrepareResponse apply(PrepareRequest request) {
try {
return finagle(decode(apply(encode(request)), PrepareResponse.class));
} catch (IOException e) {
throw handle(e);
}
}
public ExecuteResponse apply(PrepareAndExecuteRequest request) {
try {
return finagle(decode(apply(encode(request)), ExecuteResponse.class));
} catch (IOException e) {
throw handle(e);
}
}
public FetchResponse apply(FetchRequest request) {
try {
return decode(apply(encode(request)), FetchResponse.class);
} catch (IOException e) {
throw handle(e);
}
}
public CreateStatementResponse apply(CreateStatementRequest request) {
try {
return decode(apply(encode(request)), CreateStatementResponse.class);
} catch (IOException e) {
throw handle(e);
}
}
public CloseStatementResponse apply(CloseStatementRequest request) {
try {
return decode(apply(encode(request)), CloseStatementResponse.class);
} catch (IOException e) {
throw handle(e);
}
}
public CloseConnectionResponse apply(CloseConnectionRequest request) {
try {
return decode(apply(encode(request)), CloseConnectionResponse.class);
} catch (IOException e) {
throw handle(e);
}
}
public ConnectionSyncResponse apply(ConnectionSyncRequest request) {
try {
return decode(apply(encode(request)), ConnectionSyncResponse.class);
} catch (IOException e) {
throw handle(e);
}
}
}
// End JsonService.java
