/*
* Copyright 2014 Proofpoint, Inc.
*
* 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.
*/
package com.proofpoint.http.client;
import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.ObjectMapper;
import com.fasterxml.jackson.databind.exc.InvalidFormatException;
import com.fasterxml.jackson.dataformat.smile.SmileFactory;
import com.google.common.base.Supplier;
import com.google.common.base.Suppliers;
import com.google.common.collect.ImmutableSet;
import com.google.common.net.MediaType;
import com.google.common.primitives.Ints;
import com.proofpoint.json.JsonCodec;
import com.proofpoint.json.ObjectMapperProvider;
import java.io.IOException;
import java.util.Set;
import static com.google.common.net.HttpHeaders.CONTENT_TYPE;
import static com.proofpoint.http.client.ResponseHandlerUtils.propagate;
public class SmileResponseHandler<T> implements ResponseHandler<T, RuntimeException>
{
private static final MediaType MEDIA_TYPE_SMILE = MediaType.create("application", "x-jackson-smile");
private static final Supplier<ObjectMapper> OBJECT_MAPPER_SUPPLIER = Suppliers.memoize(new Supplier<ObjectMapper>()
{
@Override
public ObjectMapper get()
{
return new ObjectMapperProvider().get();
}
});
public static <T> SmileResponseHandler<T> createSmileResponseHandler(JsonCodec<T> jsonCodec)
{
return new SmileResponseHandler<>(jsonCodec);
}
public static <T> SmileResponseHandler<T> createSmileResponseHandler(JsonCodec<T> jsonCodec, int firstSuccessfulResponseCode, int... otherSuccessfulResponseCodes)
{
return new SmileResponseHandler<>(jsonCodec, firstSuccessfulResponseCode, otherSuccessfulResponseCodes);
}
private final JsonCodec<T> jsonCodec;
private final Set<Integer> successfulResponseCodes;
private SmileResponseHandler(JsonCodec<T> jsonCodec)
{
this(jsonCodec, 200, 201, 202, 203, 204, 205, 206);
}
private SmileResponseHandler(JsonCodec<T> jsonCodec, int firstSuccessfulResponseCode, int... otherSuccessfulResponseCodes)
{
this.jsonCodec = jsonCodec;
this.successfulResponseCodes = ImmutableSet.<Integer>builder().add(firstSuccessfulResponseCode).addAll(Ints.asList(otherSuccessfulResponseCodes)).build();
}
@Override
public T handleException(Request request, Exception exception)
{
throw propagate(request, exception);
}
@Override
public T handle(Request request, Response response)
{
if (!successfulResponseCodes.contains(response.getStatusCode())) {
throw new UnexpectedResponseException(
String.format("Expected response code to be %s, but was %d: %s", successfulResponseCodes, response.getStatusCode(), response.getStatusMessage()),
request,
response);
}
String contentType = response.getHeader(CONTENT_TYPE);
if (contentType == null) {
throw new UnexpectedResponseException("Content-Type is not set for response", request, response);
}
if (!MediaType.parse(contentType).is(MEDIA_TYPE_SMILE)) {
throw new UnexpectedResponseException("Expected application/x-jackson-smile response from server but got " + contentType, request, response);
}
try {
JsonParser jsonParser = new SmileFactory().createParser(response.getInputStream());
ObjectMapper objectMapper = OBJECT_MAPPER_SUPPLIER.get();
// Important: we are NOT to close the underlying stream after
// mapping, so we need to instruct parser:
jsonParser.disable(JsonParser.Feature.AUTO_CLOSE_SOURCE);
return objectMapper.readValue(jsonParser, objectMapper.getTypeFactory().constructType(jsonCodec.getType()));
}
catch (InvalidFormatException e) {
throw new IllegalArgumentException("Unable to create " + jsonCodec.getType() + " from SMILE response", e);
}
catch (IOException e) {
throw new RuntimeException("Error reading SMILE response from server", e);
}
}
}