Java tutorial
/* * Licensed to Metamarkets Group Inc. (Metamarkets) under one * or more contributor license agreements. See the NOTICE file * distributed with this work for additional information * regarding copyright ownership. Metamarkets 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 io.druid.query.aggregation.atomcube; import com.fasterxml.jackson.databind.ObjectMapper; import com.fasterxml.jackson.databind.ObjectWriter; import com.fasterxml.jackson.jaxrs.smile.SmileMediaTypes; import com.google.common.collect.ImmutableMap; import com.google.common.collect.MapMaker; import com.google.common.io.CountingOutputStream; import com.google.inject.Inject; import com.metamx.emitter.EmittingLogger; import com.metamx.emitter.service.ServiceEmitter; import io.druid.guice.annotations.Json; import io.druid.guice.annotations.Smile; import io.druid.java.util.common.guava.Sequence; import io.druid.java.util.common.guava.Sequences; import io.druid.java.util.common.guava.Yielder; import io.druid.java.util.common.guava.YieldingAccumulator; import io.druid.query.DruidMetrics; import io.druid.query.QueryRunnerFactoryConglomerate; import io.druid.server.QueryStats; import io.druid.server.RequestLogLine; import io.druid.server.log.RequestLogger; import org.joda.time.DateTime; import javax.servlet.http.HttpServletRequest; import javax.ws.rs.Consumes; import javax.ws.rs.POST; import javax.ws.rs.Path; import javax.ws.rs.Produces; import javax.ws.rs.QueryParam; import javax.ws.rs.WebApplicationException; import javax.ws.rs.core.Context; import javax.ws.rs.core.MediaType; import javax.ws.rs.core.Response; import javax.ws.rs.core.StreamingOutput; import java.io.IOException; import java.io.InputStream; import java.io.OutputStream; import java.util.Map; import java.util.UUID; @Path("/druid/v2/atomcube") public class AtomCubeQueryResource { private static final EmittingLogger log = new EmittingLogger(AtomCubeQueryResource.class); private static final String APPLICATION_SMILE = "application/smile"; private static final int RESPONSE_CTX_HEADER_LEN_LIMIT = 7 * 1024; private final ObjectMapper jsonMapper; private final ObjectMapper smileMapper; private final ServiceEmitter emitter; private final RequestLogger requestLogger; private final QueryRunnerFactoryConglomerate conglomerate; @Inject public AtomCubeQueryResource(@Json ObjectMapper jsonMapper, @Smile ObjectMapper smileMapper, ServiceEmitter emitter, RequestLogger requestLogger, QueryRunnerFactoryConglomerate conglomerate) { this.jsonMapper = jsonMapper; this.smileMapper = smileMapper; this.emitter = emitter; this.requestLogger = requestLogger; this.conglomerate = conglomerate; } @POST @Produces({ MediaType.APPLICATION_JSON, SmileMediaTypes.APPLICATION_JACKSON_SMILE }) @Consumes({ MediaType.APPLICATION_JSON, SmileMediaTypes.APPLICATION_JACKSON_SMILE, APPLICATION_SMILE }) public Response doPost(InputStream in, @QueryParam("pretty") String pretty, @Context final HttpServletRequest req // used only to get request content-type and remote address ) throws IOException { final long start = System.currentTimeMillis(); final String reqContentType = req.getContentType(); final boolean isSmile = SmileMediaTypes.APPLICATION_JACKSON_SMILE.equals(reqContentType) || APPLICATION_SMILE.equals(reqContentType); ObjectMapper objectMapper = isSmile ? smileMapper : jsonMapper; final String contentType = isSmile ? SmileMediaTypes.APPLICATION_JACKSON_SMILE : MediaType.APPLICATION_JSON; final ObjectWriter jsonWriter = pretty != null ? objectMapper.writerWithDefaultPrettyPrinter() : objectMapper.writer(); AtomCubeQuery _query = objectMapper.readValue(in, AtomCubeQuery.class); final AtomCubeQuery atomQ = (AtomCubeQuery) _query.withId(UUID.randomUUID().toString()); final Map<String, Object> responseContext1 = new MapMaker().makeMap(); Sequence res = atomQ.run(this.conglomerate.findFactory(atomQ).createRunner(null), responseContext1); final Sequence results; if (res == null) { results = Sequences.empty(); } else { results = res; } final Yielder yielder = results.toYielder(null, new YieldingAccumulator() { @Override public Object accumulate(Object accumulated, Object in) { yield(); return in; } }); final Map<String, Object> responseContext = new MapMaker().makeMap(); Response.ResponseBuilder builder = Response.ok(new StreamingOutput() { @Override public void write(OutputStream outputStream) throws IOException, WebApplicationException { CountingOutputStream os = new CountingOutputStream(outputStream); jsonWriter.writeValue(os, yielder); os.flush(); os.close(); final long queryTime = System.currentTimeMillis() - start; emitter.emit(DruidMetrics.makeQueryTimeMetric(null, jsonMapper, atomQ, req.getRemoteAddr()) .setDimension("success", "true").build("query/time", queryTime)); emitter.emit(DruidMetrics.makeQueryTimeMetric(null, jsonMapper, atomQ, req.getRemoteAddr()) .build("query/bytes", os.getCount())); requestLogger.log(new RequestLogLine(new DateTime(), req.getRemoteAddr(), atomQ, new QueryStats(ImmutableMap.<String, Object>of("query/time", queryTime, "query/bytes", os.getCount(), "success", true)))); } }, contentType).header("X-Druid-Query-Id", atomQ.getId()); String responseCtxString = jsonMapper.writeValueAsString(responseContext); return builder.header("X-Druid-Response-Context", responseCtxString).build(); } }