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//================================================================================
//Copyright (c) 2011, David Yu
//All rights reserved.
//--------------------------------------------------------------------------------
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
// 1. Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
// 3. Neither the name of protostuff nor the names of its contributors may be used
// to endorse or promote products derived from this software without
// specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
//================================================================================
package com.dyuproject.protostuffdb;
import java.io.IOException;
import com.dyuproject.protostuff.Pipe;
import com.dyuproject.protostuff.RpcResponse;
import com.dyuproject.protostuff.ds.ParamRangeKey;
/**
* List view/visitor.
*
* @author David Yu
* @created Jan 17, 2012
*/
public final class ListV
{
private ListV() {}
public static final VisitorSession.Handler VSH_PAGINATE =
new VisitorSession.Handler()
{
public void handle(VisitorSession session, RpcResponse res)
{
final ProtostuffPipe pipe = res.context.pipe;
try
{
// pipe.key is the last seen key
session.visitKind(pipe.em, -1, false, pipe.key, pipe.parentKey,
RpcResponse.PIPED_VISITOR, res);
}
finally
{
pipe.clear();
}
}
};
/*
* Visits the store starting at the {@code lastSeenKey} if provided.
*
* Otherwise the response with the result set will contain only the
* {@code entity} provided.
*/
/*public static > void paginateFrom(
byte[] lastSeenKey, int fieldNumber,
T req, Datastore store, RpcResponse res) throws IOException
{
final EntityMetadata em = req.em();
if(lastSeenKey == null || lastSeenKey.length == 0)
{
// write ts
if (!em.seq)
req.setTs(KeyUtil.getTs(req.getKey()));
res.output.writeObject(fieldNumber,
req, em.pipeSchema.wrappedSchema, true);
return;
}
final ProtostuffPipe pipe = res.context.pipe.init(
em.pipeSchema, fieldNumber, true);
try
{
store.visitKind(em, -1, false, lastSeenKey, null,
RpcResponse.PIPED_VISITOR, res);
}
finally
{
pipe.clear();
}
}*/
public static boolean list(EntityMetadata em, int fieldNumber,
ParamRangeKey prk, Datastore store, RpcResponse res) throws IOException
{
return list(em, fieldNumber,
prk.limit, prk.desc, prk.startKey, prk.parentKey,
store, res, em.pipeSchema);
}
public static boolean list(EntityMetadata em, int fieldNumber,
ParamRangeKey prk, Datastore store, RpcResponse res,
Pipe.Schema pipeSchema) throws IOException
{
return list(em, fieldNumber,
prk.limit, prk.desc, prk.startKey, prk.parentKey,
store, res, pipeSchema);
}
public static boolean list(EntityMetadata em, int fieldNumber,
int limit, boolean desc, byte[] startKey, byte[] parentKey,
Datastore store, RpcResponse res) throws IOException
{
return list(em, fieldNumber, limit, desc, startKey, parentKey,
store, res, em.pipeSchema);
}
public static boolean list(EntityMetadata em, int fieldNumber,
int limit, boolean desc, byte[] startKey, byte[] parentKey,
Datastore store, RpcResponse res,
Pipe.Schema pipeSchema) throws IOException
{
if(limit == 0)
{
if(startKey == null)
return res.fail("Key not provided.");
// a get request
final byte[] value = store.get(startKey, em, parentKey, res.context);
if(value == null)
return res.fail("Not found.");
// initialize pipe
final ProtostuffPipe pipe = res.context.pipe.em(em).set(startKey, value);
try
{
res.output.writeObject(fieldNumber, pipe, pipeSchema, true);
}
finally
{
pipe.clear();
}
return true;
}
final ProtostuffPipe pipe = res.context.pipe.init(
em, pipeSchema, fieldNumber, true);
try
{
store.visitKind(em, limit, desc, startKey, parentKey,
res.context, RpcResponse.PIPED_VISITOR, res);
}
finally
{
pipe.clear();
}
return true;
}
public static > boolean writeTo(RpcResponse res,
Datastore store, EntityMetadata em, int fieldNumber,
byte[] lastSeenKey,
byte[] value, byte[] key, byte[] parentKey,
Pipe.Schema pipeSchema) throws IOException
{
if (lastSeenKey != null)
return list(em, fieldNumber, -1, false, lastSeenKey, parentKey, store, res, pipeSchema);
final ProtostuffPipe pipe = res.context.pipe.em(em).set(key, value);
try
{
res.output.writeObject(fieldNumber, pipe, pipeSchema, true);
}
finally
{
pipe.clear();
}
return true;
}
public static > boolean writeTo(RpcResponse res,
Datastore store, EntityMetadata em, int fieldNumber,
byte[] lastSeenKey,
T entity, byte[] key, byte[] parentKey) throws IOException
{
if (lastSeenKey != null)
return list(em, fieldNumber, -1, false, lastSeenKey, parentKey, store, res);
entity.setKey(key);
if (!em.seq)
entity.setTs(KeyUtil.extractTsFrom(key));
res.output.writeObject(fieldNumber,
entity, em.pipeSchema.wrappedSchema, true);
return true;
}
public static > boolean writeTo(RpcResponse res,
Datastore store, EntityMetadata em, int fieldNumber,
Cache cache, int lastSeenId,
byte[] value, int id, byte[] key, byte[] parentKey,
Pipe.Schema pipeSchema) throws IOException
{
final ProtostuffPipe pipe;
if (lastSeenId == 0 || id == (lastSeenId + 1))
{
pipe = res.context.pipe.em(em).set(key, value);
try
{
res.output.writeObject(fieldNumber, pipe, pipeSchema, true);
}
finally
{
pipe.clear();
}
}
else
{
pipe = res.context.pipe.init(em, pipeSchema, fieldNumber, true);
try
{
cache.pipeTo(res, lastSeenId);
}
finally
{
pipe.clear();
}
}
return true;
}
public static > boolean writeTo(RpcResponse res,
Datastore store, EntityMetadata em, int fieldNumber,
Cache cache, int lastSeenId,
T entity, byte[] key, byte[] parentKey) throws IOException
{
if (lastSeenId == 0 || entity.getId() == (lastSeenId + 1))
{
if (!em.seq)
entity.setTs(KeyUtil.extractTsFrom(key));
res.output.writeObject(fieldNumber,
entity, em.pipeSchema.wrappedSchema, true);
}
else
{
final ProtostuffPipe pipe = res.context.pipe.init(
entity.em(), entity.em().pipeSchema, fieldNumber, true);
try
{
cache.pipeTo(res, lastSeenId);
}
finally
{
pipe.clear();
}
}
return true;
}
/*public static > boolean writeTo(RpcResponse res,
Datastore store, EntityMetadata em, int fieldNumber,
HasIdAndKVCache cache, int lastSeenId,
byte[] value, int id, byte[] key, byte[] parentKey,
Pipe.Schema pipeSchema) throws IOException
{
final ProtostuffPipe pipe;
if (lastSeenId == 0 || id == (lastSeenId + 1))
{
pipe = res.context.pipe.em(em).set(key, value);
try
{
res.output.writeObject(fieldNumber, pipe, pipeSchema, true);
}
finally
{
pipe.clear();
}
}
else
{
pipe = res.context.pipe.init(em, pipeSchema, fieldNumber, true);
try
{
cache.pipeTo(res, lastSeenId);
}
finally
{
pipe.clear();
}
}
return true;
}
public static > boolean writeTo(RpcResponse res,
Datastore store, EntityMetadata em, int fieldNumber,
HasIdAndKVCache cache, int lastSeenId,
T entity, byte[] key, byte[] parentKey) throws IOException
{
if (lastSeenId == 0 || entity.getId() == (lastSeenId + 1))
{
if (!em.seq)
entity.setTs(KeyUtil.extractTsFrom(key));
res.output.writeObject(fieldNumber,
entity, entity.em().pipeSchema.wrappedSchema, true);
}
else
{
final ProtostuffPipe pipe = res.context.pipe.init(
entity.em(), entity.em().pipeSchema, fieldNumber, true);
try
{
cache.pipeTo(res, lastSeenId);
}
finally
{
pipe.clear();
}
}
return true;
}*/
}
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