/**

* Copyright 2013-2014 Ronald W Hoffman

*

* 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 JavaBitcoin;

import java.io.ByteArrayInputStream;

import java.util.ArrayList;

import java.util.List;

/**

* The 'mempool' message requests a list of transactions in the peer memory pool.

* The response is an 'inv' message listing the transactions in the pool.

*

* The message consists of just the message header.

*/

public class MempoolMessage {

/**

* Processes a 'mempool' message and returns an 'inv' message in response

*

* @param msg Message

* @param inStream Message data stream

*/

public static void processMempoolMessage(Message msg, ByteArrayInputStream inStream) {

//

// Get the list of transaction identifiers in the memory pool (return a maximum

// of MAX_INV_ENTRIES)

//

List<Sha256Hash> txList;

synchronized(Parameters.lock) {

txList = new ArrayList<>(Parameters.txPool.size());

for (StoredTransaction tx : Parameters.txPool) {

txList.add(tx.getHash());

if (txList.size() == InventoryMessage.MAX_INV_ENTRIES)

break;

}

}

//

// Build the 'inv' message

//

Message invMsg = InventoryMessage.buildInventoryMessage(msg.getPeer(), Parameters.INV_TX, txList);

msg.setBuffer(invMsg.getBuffer());

msg.setCommand(invMsg.getCommand());

}

}