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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;
import static com.basho.riak.client.util.CharsetUtils.*;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Date;
import java.util.HashMap;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.concurrent.ConcurrentHashMap;
import java.util.concurrent.CopyOnWriteArrayList;
import org.apache.http.client.methods.HttpEntityEnclosingRequestBase;
import org.apache.http.client.methods.HttpRequestBase;
import org.apache.http.entity.AbstractHttpEntity;
import org.apache.http.entity.ByteArrayEntity;
import org.apache.http.entity.InputStreamEntity;
import com.basho.riak.client.http.request.RequestMeta;
import com.basho.riak.client.http.request.RiakWalkSpec;
import com.basho.riak.client.http.response.FetchResponse;
import com.basho.riak.client.http.response.HttpResponse;
import com.basho.riak.client.http.response.RiakIORuntimeException;
import com.basho.riak.client.http.response.RiakResponseRuntimeException;
import com.basho.riak.client.http.response.StoreResponse;
import com.basho.riak.client.http.response.WalkResponse;
import com.basho.riak.client.http.util.ClientUtils;
import com.basho.riak.client.http.util.Constants;
/**
* A Riak object.
*/
public class RiakObject {
private static final byte[] EMPTY = new byte[] {};
private RiakClient riak;
private String bucket;
private String key;
private boolean isDeleted;
private byte[] value;
private List links;
private final Object indexLock = new Object();
@SuppressWarnings("rawtypes") private List indexes;
private Map userMetaData;
private String contentType;
private String vclock;
private String lastmod;
private String vtag;
private InputStream valueStream;
private Long valueStreamLength;
/**
* Create an object. The content type defaults to
* application/octet-stream.
*
* @param riak
* Riak instance this object is associated with, which is used by
* the convenience methods in this class (e.g.
* {@link RiakObject#store()}).
* @param bucket
* The object's bucket
* @param key
* The object's key
* @param value
* The object's value
* @param contentType
* The object's content type which defaults to
* application/octet-stream if null.
* @param links
* Links to other objects
* @param userMetaData
* Custom metadata key-value pairs for this object
* @param vclock
* An opaque vclock assigned by Riak
* @param lastmod
* The last time this object was modified according to Riak
* @param vtag
* This object's entity tag assigned by Riak
*/
public RiakObject(RiakClient riak, String bucket, String key, byte[] value, String contentType,
List links, Map userMetaData, String vclock, String lastmod,
String vtag, @SuppressWarnings("rawtypes") List indexes, boolean isDeleted) {
this.riak = riak;
this.bucket = bucket;
this.key = key;
this.vclock = vclock;
this.lastmod = lastmod;
this.vtag = vtag;
this.isDeleted = isDeleted;
safeSetValue(value);
this.contentType = contentType == null ? Constants.CTYPE_OCTET_STREAM : contentType;
safeSetLinks(links);
safeSetUsermetaData(userMetaData);
safeSetIndexes(indexes);
}
/**
* Create an empty object. The content type defaults to
* application/octet-stream.
*
* @param riak
* Riak instance this object is associated with, which is used by
* the convenience methods in this class (e.g.
* {@link RiakObject#store()}).
* @param bucket
* The object's bucket
* @param key
* The object's key
* @param value
* The object's value
* @param contentType
* The object's content type which defaults to
* application/octet-stream if null.
* @param links
* Links to other objects
* @param userMetaData
* Custom metadata key-value pairs for this object
* @param vclock
* An opaque vclock assigned by Riak
* @param lastmod
* The last time this object was modified according to Riak
* @param vtag
* This object's entity tag assigned by Riak
*/
public RiakObject(RiakClient riak, String bucket, String key, byte[] value, String contentType,
List links, Map userMetaData, String vclock, String lastmod, String vtag) {
this(riak, bucket, key, value, contentType, links, userMetaData, vclock, lastmod, vtag, null, false);
}
public RiakObject(RiakClient riak, String bucket, String key) {
this(riak, bucket, key, null, null, null, null, null, null, null);
}
public RiakObject(RiakClient riak, String bucket, String key, byte[] value) {
this(riak, bucket, key, value, null, null, null, null, null, null);
}
public RiakObject(RiakClient riak, String bucket, String key, byte[] value, String contentType) {
this(riak, bucket, key, value, contentType, null, null, null, null, null);
}
public RiakObject(RiakClient riak, String bucket, String key, byte[] value, String contentType, List links) {
this(riak, bucket, key, value, contentType, links, null, null, null, null);
}
public RiakObject(RiakClient riak, String bucket, String key, byte[] value, String contentType,
List links, Map userMetaData) {
this(riak, bucket, key, value, contentType, links, userMetaData, null, null, null);
}
public RiakObject(String bucket, String key) {
this(null, bucket, key, null, null, null, null, null, null, null);
}
public RiakObject(String bucket, String key, byte[] value) {
this(null, bucket, key, value, null, null, null, null, null, null);
}
public RiakObject(String bucket, String key, byte[] value, String contentType) {
this(null, bucket, key, value, contentType, null, null, null, null, null);
}
public RiakObject(String bucket, String key, byte[] value, String contentType, List links) {
this(null, bucket, key, value, contentType, links, null, null, null, null);
}
public RiakObject(String bucket, String key, byte[] value, String contentType, List links,
Map userMetaData) {
this(null, bucket, key, value, contentType, links, userMetaData, null, null, null);
}
public RiakObject(String bucket, String key, byte[] value, String contentType, List links,
Map userMetaData, String vclock, String lastmod, String vtag) {
this(null, bucket, key, value, contentType, links, userMetaData, vclock, lastmod, vtag);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getRiakClient()
*/
public RiakClient getRiakClient() {
return riak;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#setRiakClient(com.basho.riak.client.RiakClient)
*/
public RiakObject setRiakClient(RiakClient client) {
riak = client;
return this;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#copyData(com.basho.riak.client.RiakObject)
*/
public void copyData(RiakObject object) {
if (object == null)
return;
if (object.value != null) {
value = object.value.clone();
} else {
value = null;
}
valueStream = object.valueStream;
valueStreamLength = object.valueStreamLength;
setLinks(object.links);
userMetaData = new HashMap();
if (object.userMetaData != null) {
userMetaData.putAll(object.userMetaData);
}
contentType = object.contentType;
vclock = object.vclock;
lastmod = object.lastmod;
vtag = object.vtag;
isDeleted = object.isDeleted;
}
/**
* Perform a shallow copy of the object
*/
void shallowCopy(RiakObject object) {
value = object.value;
this.links = object.links;
userMetaData = object.userMetaData;
contentType = object.contentType;
vclock = object.vclock;
lastmod = object.lastmod;
vtag = object.vtag;
valueStream = object.valueStream;
valueStreamLength = object.valueStreamLength;
isDeleted = object.isDeleted;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#updateMeta(com.basho.riak.client.response.StoreResponse)
*/
public void updateMeta(StoreResponse response) {
if (response == null) {
vclock = null;
lastmod = null;
vtag = null;
} else {
vclock = response.getVclock();
lastmod = response.getLastmod();
vtag = response.getVtag();
}
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#updateMeta(com.basho.riak.client.response.FetchResponse)
*/
public void updateMeta(FetchResponse response) {
if (response == null || response.getObject() == null) {
vclock = null;
lastmod = null;
vtag = null;
} else {
vclock = response.getObject().getVclock();
lastmod = response.getObject().getLastmod();
vtag = response.getObject().getVtag();
}
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getBucket()
*/
public String getBucket() {
return bucket;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getKey()
*/
public String getKey() {
return key;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getValue()
*/
public String getValue() {
return (value == null ? null : asString(value, getCharset(contentType)));
}
public boolean isDeleted() {
return this.isDeleted;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getValueAsBytes()
*/
public byte[] getValueAsBytes() {
return value == null ? value : value.clone();
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#setValue(java.lang.String)
*/
public void setValue(String value) {
if (value != null) {
this.value = asBytes(value, getCharset(contentType));
} else {
this.value = null;
}
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#setValue(byte[])
*/
public void setValue(byte[] value) {
safeSetValue(value);
}
/**
*
* @param value
*/
private void safeSetValue(final byte[] value) {
if(value != null) {
this.value = value.clone();
} else {
this.value = null;
}
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#setValueStream(java.io.InputStream, java.lang.Long)
*/
public void setValueStream(InputStream in, Long len) {
valueStream = in;
valueStreamLength = len;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#setValueStream(java.io.InputStream)
*/
public void setValueStream(InputStream in) {
valueStream = in;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getValueStream()
*/
public InputStream getValueStream() {
return valueStream;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#setValueStreamLength(java.lang.Long)
*/
public void setValueStreamLength(Long len) {
valueStreamLength = len;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getValueStreamLength()
*/
public Long getValueStreamLength() {
return valueStreamLength;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getLinks()
*/
@Deprecated
public List getLinks() {
return this.links;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#setLinks(java.util.List)
*/
public void setLinks(List links) {
safeSetLinks(links);
}
private void safeSetLinks(final List links) {
if (links == null) {
this.links = new CopyOnWriteArrayList();
} else {
this.links = new CopyOnWriteArrayList(deepCopy(links));
}
}
@SuppressWarnings("rawtypes") private void safeSetIndexes(final List indexes) {
if (indexes == null) {
this.indexes = new ArrayList();
} else {
this.indexes = new ArrayList(indexes);
}
}
/**
* Creates a new RiakLink for each RiakLink in links and adds it to a new List.
*
* @param links a List of {@link RiakLink}s
* @return a deep copy of List.
*/
private List deepCopy(List links) {
final ArrayList copyLinks = new ArrayList();
for(RiakLink link : links) {
copyLinks.add(new RiakLink(link));
}
return copyLinks;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#addLink(com.basho.riak.client.RiakLink)
*/
public RiakObject addLink(RiakLink link) {
if (link != null) {
links.add(link);
}
return this;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#removeLink(com.basho.riak.client.RiakLink)
*/
public RiakObject removeLink(final RiakLink link) {
this.links.remove(link);
return this;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#hasLinks()
*/
public boolean hasLinks() {
return !links.isEmpty();
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#numLinks()
*/
public int numLinks() {
return links.size();
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#hasLink(com.basho.riak.client.RiakLink)
*/
public boolean hasLink(final RiakLink riakLink) {
return links.contains(riakLink);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getUsermeta()
*/
@Deprecated
public Map getUsermeta() {
return userMetaData;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#setUsermeta(java.util.Map)
*/
public void setUsermeta(final Map userMetaData) {
safeSetUsermetaData(userMetaData);
}
private void safeSetUsermetaData(final Map userMetaData) {
if (userMetaData == null) {
this.userMetaData = new ConcurrentHashMap();
} else {
this.userMetaData = new ConcurrentHashMap(userMetaData);
}
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#addUsermetaItem(java.lang.String, java.lang.String)
*/
public RiakObject addUsermetaItem(String key, String value) {
userMetaData.put(key, value);
return this;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#hasUsermeta()
*/
public boolean hasUsermeta() {
return !userMetaData.isEmpty();
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#numUsermetaItems()
*/
public int numUsermetaItems() {
return userMetaData.size();
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#hasUsermetaItem(java.lang.String)
*/
public boolean hasUsermetaItem(String key) {
return userMetaData.containsKey(key);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getUsermetaItem(java.lang.String)
*/
public String getUsermetaItem(String key) {
return userMetaData.get(key);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#removeUsermetaItem(java.lang.String)
*/
public void removeUsermetaItem(String key) {
userMetaData.remove(key);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#usermetaKeys()
*/
public Iterable usermetaKeys() {
return userMetaData.keySet();
}
/**
* @return a *copy* of the list of {@link RiakIndex}es for this object
*/
@SuppressWarnings("rawtypes") public List getIndexes() {
synchronized (indexLock) {
return new ArrayList(indexes);
}
}
/**
* Add a binary index to the object
*
* @param name
* of the index
* @param value
* the value to add to the index
* @return this
*/
public RiakObject addIndex(String name, String value) {
synchronized (indexLock) {
indexes.add(new BinIndex(name, value));
}
return this;
}
/**
* Add an int index to this object
*
* @param name
* of the index
* @param value
* the value to add to the index
* @return this
*/
public RiakObject addIndex(String name, long value) {
synchronized (indexLock) {
indexes.add(new IntIndex(name, value));
}
return this;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getContentType()
*/
public String getContentType() {
return contentType;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#setContentType(java.lang.String)
*/
public void setContentType(String contentType) {
if (contentType != null) {
this.contentType = contentType;
} else {
this.contentType = Constants.CTYPE_OCTET_STREAM;
}
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getVclock()
*/
public String getVclock() {
return vclock;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getLastmod()
*/
public String getLastmod() {
return lastmod;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getLastmodAsDate()
*/
public Date getLastmodAsDate() {
return ClientUtils.parseDate(lastmod);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#getVtag()
*/
public String getVtag() {
return vtag;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#store(com.basho.riak.client.request.RequestMeta)
*/
public StoreResponse store(RequestMeta meta) {
return store(riak, meta);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#store()
*/
public StoreResponse store() {
return store(riak, null);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#store(com.basho.riak.client.RiakClient, com.basho.riak.client.request.RequestMeta)
*/
public StoreResponse store(RiakClient riak, RequestMeta meta) {
if (riak == null)
throw new IllegalStateException("Cannot store an object without a RiakClient");
StoreResponse r = riak.store(this, meta);
if (r.isSuccess()) {
this.updateMeta(r);
}
return r;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#fetch(com.basho.riak.client.request.RequestMeta)
*/
public FetchResponse fetch(RequestMeta meta) {
if (riak == null)
throw new IllegalStateException("Cannot fetch an object without a RiakClient");
FetchResponse r = riak.fetch(bucket, key, meta);
if (r.getObject() != null) {
RiakObject other = r.getObject();
shallowCopy(other);
r.setObject(this);
}
return r;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#fetch()
*/
public FetchResponse fetch() {
return fetch(null);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#fetchMeta(com.basho.riak.client.request.RequestMeta)
*/
public FetchResponse fetchMeta(RequestMeta meta) {
if (riak == null)
throw new IllegalStateException("Cannot fetch meta for an object without a RiakClient");
FetchResponse r = riak.fetchMeta(bucket, key, meta);
if (r.isSuccess()) {
this.updateMeta(r);
}
return r;
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#fetchMeta()
*/
public FetchResponse fetchMeta() {
return fetchMeta(null);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#delete(com.basho.riak.client.request.RequestMeta)
*/
public HttpResponse delete(RequestMeta meta) {
if (riak == null)
throw new IllegalStateException("Cannot delete an object without a RiakClient");
return riak.delete(bucket, key, meta);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#delete()
*/
public HttpResponse delete() {
return delete(null);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#walk(java.lang.String, java.lang.String, boolean)
*/
public LinkBuilder walk(String bucket, String tag, boolean keep) {
return new LinkBuilder().walk(bucket, tag, keep);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#walk(java.lang.String, java.lang.String)
*/
public LinkBuilder walk(String bucket, String tag) {
return new LinkBuilder().walk(bucket, tag);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#walk(java.lang.String, boolean)
*/
public LinkBuilder walk(String bucket, boolean keep) {
return new LinkBuilder().walk(bucket, keep);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#walk(java.lang.String)
*/
public LinkBuilder walk(String bucket) {
return new LinkBuilder().walk(bucket);
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#walk()
*/
public LinkBuilder walk() {
return new LinkBuilder().walk();
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#walk(boolean)
*/
public LinkBuilder walk(boolean keep) {
return new LinkBuilder().walk(keep);
}
/**
* Serializes this object to an existing {@link HttpRequestBase} which can
* be sent as an HTTP request. Specifically, sends the object's link,
* user-defined metadata and vclock as HTTP headers and the value as the
* body. Used by {@link RiakClient} to create PUT requests.
*
* if the this RiakObject's value is a stream, and no length is set, the
* stream is first buffered into a byte array before being written
*/
public void writeToHttpMethod(HttpRequestBase httpMethod) {
// Serialize headers
String basePath = getBasePathFromHttpMethod(httpMethod);
writeLinks(httpMethod, basePath);
for (String name : userMetaData.keySet()) {
httpMethod.addHeader(Constants.HDR_USERMETA_REQ_PREFIX + name, userMetaData.get(name));
}
writeIndexes(httpMethod);
if (vclock != null) {
httpMethod.addHeader(Constants.HDR_VCLOCK, vclock);
}
// Serialize body
if (httpMethod instanceof HttpEntityEnclosingRequestBase) {
HttpEntityEnclosingRequestBase entityEnclosingMethod = (HttpEntityEnclosingRequestBase) httpMethod;
AbstractHttpEntity entity = null;
// Any value set using setValueAsStream() has precedent over value
// set using setValue()
if (valueStream != null) {
if (valueStreamLength != null && valueStreamLength >= 0) {
entity = new InputStreamEntity(valueStream, valueStreamLength);
} else {
// since apache http client 4.1 no longer supports buffering stream entities, but we can't change API
// behaviour, here we have to buffer the whole content
entity = new ByteArrayEntity(ClientUtils.bufferStream(valueStream));
}
} else if (value != null) {
entity = new ByteArrayEntity(value);
} else {
entity = new ByteArrayEntity(EMPTY);
}
entity.setContentType(contentType);
entityEnclosingMethod.setEntity(entity);
}
}
/**
* Write HTTP header for each secondary index
* @param httpMethod
*/
@SuppressWarnings("rawtypes") private void writeIndexes(HttpRequestBase httpMethod) {
// write 2i headers
synchronized (indexLock) {
for (RiakIndex i : indexes) {
String index = i.getName();
httpMethod.addHeader(Constants.HDR_SEC_INDEX_REQ_PREFIX + index, i.getValue().toString());
}
}
}
private void writeLinks(HttpRequestBase httpMethod, String basePath) {
StringBuilder linkHeader = new StringBuilder();
for (RiakLink link : this.links) {
if (linkHeader.length() > 0) {
linkHeader.append(", ");
}
linkHeader.append("<");
linkHeader.append(basePath);
linkHeader.append("/");
linkHeader.append(link.getBucket());
linkHeader.append("/");
linkHeader.append(link.getKey());
linkHeader.append(">; ");
linkHeader.append(Constants.LINK_TAG);
linkHeader.append("=\"");
linkHeader.append(link.getTag());
linkHeader.append("\"");
// To avoid (MochiWeb) problems with too long headers, flush if
// it grows too big:
if (linkHeader.length() > 2000) {
httpMethod.addHeader(Constants.HDR_LINK, linkHeader.toString());
linkHeader = new StringBuilder();
}
}
if (linkHeader.length() > 0) {
httpMethod.addHeader(Constants.HDR_LINK, linkHeader.toString());
}
}
String getBasePathFromHttpMethod(HttpRequestBase httpMethod) {
if (httpMethod == null || httpMethod.getURI() == null)
return "";
String path = httpMethod.getURI().getRawPath();
int idx = path.length() - 1;
// ignore any trailing slash
if (path.endsWith("/")) {
idx--;
}
// trim off last two path components
idx = path.lastIndexOf('/', idx);
idx = path.lastIndexOf('/', idx - 1);
if (idx <= 0)
return "";
return path.substring(0, idx);
}
/**
* Created by links() as a convenient way to build up link walking queries
*/
public class LinkBuilder {
private RiakWalkSpec walkSpec = new RiakWalkSpec();
public LinkBuilder walk() {
walkSpec.addStep(RiakWalkSpec.WILDCARD, RiakWalkSpec.WILDCARD);
return this;
}
public LinkBuilder walk(boolean keep) {
walkSpec.addStep(RiakWalkSpec.WILDCARD, RiakWalkSpec.WILDCARD, keep);
return this;
}
public LinkBuilder walk(String bucket) {
walkSpec.addStep(bucket, RiakWalkSpec.WILDCARD);
return this;
}
public LinkBuilder walk(String bucket, boolean keep) {
walkSpec.addStep(bucket, RiakWalkSpec.WILDCARD, keep);
return this;
}
public LinkBuilder walk(String bucket, String tag) {
walkSpec.addStep(bucket, tag);
return this;
}
public LinkBuilder walk(String bucket, String tag, boolean keep) {
walkSpec.addStep(bucket, tag, keep);
return this;
}
public String getWalkSpec() {
return walkSpec.toString();
}
/**
* Execute the link walking query by calling
* {@link RiakClient#walk(String, String, String, RequestMeta)}.
*
* @param meta
* Extra metadata to attach to the request such as HTTP
* headers or query parameters.
* @return See
* {@link RiakClient#walk(String, String, String, RequestMeta)}.
*
* @throws RiakIORuntimeException
* If an error occurs during communication with the Riak
* server.
* @throws RiakResponseRuntimeException
* If the Riak server returns a malformed response.
*/
public WalkResponse run(RequestMeta meta) {
if (riak == null)
throw new IllegalStateException("Cannot perform object link walk without a RiakClient");
return riak.walk(bucket, key, getWalkSpec(), meta);
}
public WalkResponse run() {
return run(null);
}
}
/* (non-Javadoc)
* @see com.basho.riak.client.HttpRiakObject#iterableLinks()
*/
public Iterable iterableLinks() {
return new Iterable() {
public Iterator iterator() {
return links.iterator();
}
};
}
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