com.hazelcast.org.apache.calcite.avatica.remote.JsonHandler Maven / Gradle / Ivy
/*
* 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 com.hazelcast.org.apache.calcite.avatica.remote;
import com.hazelcast.org.apache.calcite.avatica.metrics.MetricsSystem;
import com.hazelcast.org.apache.calcite.avatica.metrics.Timer;
import com.hazelcast.org.apache.calcite.avatica.metrics.Timer.Context;
import com.hazelcast.org.apache.calcite.avatica.remote.Service.Request;
import com.hazelcast.org.apache.calcite.avatica.remote.Service.Response;
import com.hazelcast.com.fasterxml.jackson.databind.ObjectMapper;
import java.io.IOException;
import java.io.StringWriter;
/**
* Implementation of {@link com.hazelcast.org.apache.calcite.avatica.remote.Handler}
* that decodes JSON requests, sends them to a {@link Service},
* and encodes the responses into JSON.
*
* @see com.hazelcast.org.apache.calcite.avatica.remote.JsonService
*/
public class JsonHandler extends AbstractHandler {
protected static final ObjectMapper MAPPER = JsonService.MAPPER;
final MetricsSystem metrics;
final Timer serializationTimer;
public JsonHandler(Service service, MetricsSystem metrics) {
super(service);
this.metrics = metrics;
this.serializationTimer = this.metrics.getTimer(
MetricsHelper.concat(JsonHandler.class, HANDLER_SERIALIZATION_METRICS_NAME));
}
public HandlerResponse apply(String jsonRequest) {
return super.apply(jsonRequest);
}
@Override Request decode(String request) throws IOException {
try (final Context ctx = serializationTimer.start()) {
return MAPPER.readValue(request, Service.Request.class);
}
}
/**
* Serializes the provided object as JSON.
*
* @param response The object to serialize.
* @return A JSON string.
*/
@Override String encode(Response response) throws IOException {
try (final Context ctx = serializationTimer.start()) {
final StringWriter w = new StringWriter();
MAPPER.writeValue(w, response);
return w.toString();
}
}
}
// End JsonHandler.java
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