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HttpClient-based client for Riak
/*
* This file is provided 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.basho.riak.client.http.plain;
import java.io.IOException;
import java.util.Arrays;
import java.util.Collection;
import java.util.List;
import com.basho.riak.client.http.RiakBucketInfo;
import com.basho.riak.client.http.RiakClient;
import com.basho.riak.client.http.RiakConfig;
import com.basho.riak.client.http.RiakObject;
import com.basho.riak.client.http.request.RequestMeta;
import com.basho.riak.client.http.request.RiakWalkSpec;
import com.basho.riak.client.http.response.BucketResponse;
import com.basho.riak.client.http.response.FetchResponse;
import com.basho.riak.client.http.response.HttpResponse;
import com.basho.riak.client.http.response.RiakExceptionHandler;
import com.basho.riak.client.http.response.RiakResponseRuntimeException;
import com.basho.riak.client.http.response.StoreResponse;
import com.basho.riak.client.http.response.StreamHandler;
import com.basho.riak.client.http.response.WalkResponse;
/**
* An adapter from {@link RiakClient} to a slightly less HTTP, more
* Java-centric, interface. Objects are returned without HTTP specific
* information and exceptions are thrown on unsuccessful responses.
*/
public class PlainClient {
private RiakClient impl;
/** Connect to Riak using the given configuration. */
public static PlainClient getClient(RiakConfig config) {
return new PlainClient(new RiakClient(config));
}
/** Connect to Riak using the given URL. */
public static PlainClient getClient(String url) {
return new PlainClient(new RiakClient(url));
}
/**
* The primary constructor. Wraps an existing {@link RiakClient} and
* installs a custom {@link RiakExceptionHandler}.
*/
public PlainClient(RiakClient riakClient) {
impl = riakClient;
impl.setExceptionHandler(new ConvertToCheckedExceptions());
}
/**
* Like
* {@link RiakClient#setBucketSchema(String, RiakBucketInfo, RequestMeta)},
* except throws on a non-204 response.
*
* @throws RiakIOException
* If an error occurs during communication with the Riak server.
* @throws RiakResponseException
* if the server does not successfully update the bucket schema.
*/
public void setBucketSchema(String bucket, RiakBucketInfo bucketInfo, RequestMeta meta) throws RiakIOException,
RiakResponseException {
HttpResponse r = impl.setBucketSchema(bucket, bucketInfo, meta);
if (r.getStatusCode() != 204)
throw new RiakResponseException(new RiakResponseRuntimeException(r, r.getBodyAsString()));
}
public void setBucketSchema(String bucket, RiakBucketInfo bucketInfo) throws RiakIOException, RiakResponseException {
setBucketSchema(bucket, bucketInfo, null);
}
/**
* Like {@link RiakClient#listBucket(String, RequestMeta)}, except throws on
* a non-200 response
*
* @throws RiakIOException
* If an error occurs during communication with the Riak server.
* @throws RiakResponseException
* if the server does not return the bucket information
*/
public RiakBucketInfo listBucket(String bucket, RequestMeta meta) throws RiakIOException, RiakResponseException {
BucketResponse r = impl.listBucket(bucket, meta);
if (r.getStatusCode() != 200)
throw new RiakResponseException(new RiakResponseRuntimeException(r, r.getBodyAsString()));
return r.getBucketInfo();
}
public RiakBucketInfo listBucket(String bucket) throws RiakIOException, RiakResponseException {
return listBucket(bucket, null);
}
/**
* Like {@link RiakClient#store(RiakObject, RequestMeta)}, except throws on
* a non-200 or 204 response and updates the passed in {@link RiakObject}
* with new metadata from Riak.
*
* @throws RiakIOException
* If an error occurs during communication with the Riak server.
* @throws RiakResponseException
* If the server does not succesfully store the object.
*/
public void store(RiakObject object, RequestMeta meta) throws RiakIOException, RiakResponseException {
StoreResponse r = impl.store(object, meta);
if (r.getStatusCode() != 200 && r.getStatusCode() != 204)
throw new RiakResponseException(new RiakResponseRuntimeException(r, r.getBodyAsString()));
object.updateMeta(r);
}
public void store(RiakObject object) throws RiakIOException, RiakResponseException {
store(object, null);
}
/**
* Like {@link RiakClient#fetchMeta(String, String, RequestMeta)}, except it
* returns the fetched object metadata directly or throws if the response is
* not a 200, 304 or 404.
*
* @return {@link RiakObject} or null if object doesn't exist.
*
* @throws RiakIOException
* If an error occurs during communication with the Riak server.
* @throws RiakResponseException
* If the server does return a valid object
*/
public RiakObject fetchMeta(String bucket, String key, RequestMeta meta) throws RiakIOException,
RiakResponseException {
FetchResponse r = impl.fetchMeta(bucket, key, meta);
if (r.getStatusCode() == 404)
return null;
if (r.getStatusCode() != 200 && r.getStatusCode() != 304)
throw new RiakResponseException(new RiakResponseRuntimeException(r, r.getBodyAsString()));
if (r.getStatusCode() == 200 && !r.hasObject())
throw new RiakResponseException(new RiakResponseRuntimeException(r, "Failed to parse metadata"));
return r.getObject();
}
public RiakObject fetchMeta(String bucket, String key) throws RiakIOException, RiakResponseException {
return fetchMeta(bucket, key, null);
}
/**
* Like {@link RiakClient#fetch(String, String, RequestMeta)}, except it
* returns the fetched object directly or throws if the response is not a
* 200, 304 or 404.
*
* @return {@link RiakObject} or null if object doesn't exist. If siblings
* exist, then returns one of the siblings.
* @throws RiakIOException
* If an error occurs during communication with the Riak server.
* @throws RiakResponseException
* If the server does return a valid object
*/
public RiakObject fetch(String bucket, String key, RequestMeta meta) throws RiakIOException, RiakResponseException {
FetchResponse r = impl.fetch(bucket, key, meta);
if (r.getStatusCode() == 404)
return null;
if (r.getStatusCode() != 200 && r.getStatusCode() != 304)
throw new RiakResponseException(new RiakResponseRuntimeException(r, r.getBodyAsString()));
if (r.getStatusCode() == 200 && !r.hasObject())
throw new RiakResponseException(new RiakResponseRuntimeException(r, "Failed to parse object"));
return r.getObject();
}
public RiakObject fetch(String bucket, String key) throws RiakIOException, RiakResponseException {
return fetch(bucket, key, null);
}
/**
* Like {@link RiakClient#fetch(String, String, RequestMeta)}, except it
* returns the all the fetched objects directly or throws if the response is
* not a 200, 304 or 404.
*
* @return All sibling {@link RiakObject} or null no object exist.
* @throws RiakIOException
* If an error occurs during communication with the Riak server.
* @throws RiakResponseException
* If the server does return any valid objects
*/
public Collection fetchAll(String bucket, String key, RequestMeta meta)
throws RiakIOException, RiakResponseException {
FetchResponse r = impl.fetch(bucket, key, meta);
if (r.getStatusCode() == 404)
return null;
if (r.getStatusCode() != 200 && r.getStatusCode() != 304)
throw new RiakResponseException(new RiakResponseRuntimeException(r, r.getBodyAsString()));
if (r.getStatusCode() == 200 && !(r.hasObject() || r.hasSiblings()))
throw new RiakResponseException(new RiakResponseRuntimeException(r, "Failed to parse object"));
if (r.hasSiblings())
return r.getSiblings();
return Arrays.asList(r.getObject());
}
public Collection fetchAll(String bucket, String key) throws RiakIOException,
RiakResponseException {
return fetchAll(bucket, key, null);
}
/**
* Identical to
* {@link RiakClient#stream(String, String, StreamHandler, RequestMeta)}.
*/
public boolean stream(String bucket, String key, StreamHandler handler, RequestMeta meta) throws IOException {
return impl.stream(bucket, key, handler, meta);
}
/**
* Like {@link RiakClient#delete(String, String, RequestMeta)}, except
* throws on a non-200 or 404 response. Note that delete succeeds if the
* object did not previously exist (404 response).
*
* @throws RiakIOException
* If an error occurs during communication with the Riak server.
* @throws RiakResponseException
* If the object was not deleted.
*/
public void delete(String bucket, String key, RequestMeta meta) throws RiakIOException, RiakResponseException {
HttpResponse r = impl.delete(bucket, key, meta);
if (r.getStatusCode() != 204 && r.getStatusCode() != 404)
throw new RiakResponseException(new RiakResponseRuntimeException(r, r.getBodyAsString()));
}
public void delete(String bucket, String key) throws RiakIOException, RiakResponseException {
delete(bucket, key, null);
}
/**
* Like {@link RiakClient#walk(String, String, String, RequestMeta)}, except
* throws on a non-200 or 404 response.
*
* @return list of lists of {@link RiakObject}s corresponding to steps of
* the walk. Returns null if the source object doesn't exist.
* @throws RiakIOException
* If an error occurs during communication with the Riak server.
* @throws RiakResponseException
* If the links could not be walked or the result steps were not
* returned.
*/
public List> walk(String bucket, String key, String walkSpec, RequestMeta meta)
throws RiakIOException, RiakResponseException {
WalkResponse r = impl.walk(bucket, key, walkSpec, meta);
if (r.getStatusCode() == 404)
return null;
if (r.getStatusCode() != 200)
throw new RiakResponseException(new RiakResponseRuntimeException(r, r.getBodyAsString()));
if (!r.hasSteps())
throw new RiakResponseException(new RiakResponseRuntimeException(r, "Failed to parse walk results"));
return r.getSteps();
}
public List> walk(String bucket, String key, String walkSpec)
throws RiakIOException, RiakResponseException {
return walk(bucket, key, walkSpec, null);
}
public List> walk(String bucket, String key, RiakWalkSpec walkSpec)
throws RiakIOException, RiakResponseException {
return walk(bucket, key, walkSpec.toString(), null);
}
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