/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* 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 org.apache.zookeeper.server.util;
import java.io.ByteArrayInputStream;
import java.io.EOFException;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.jute.BinaryInputArchive;
import org.apache.jute.InputArchive;
import org.apache.jute.OutputArchive;
import org.apache.jute.Record;
import org.apache.zookeeper.ZooDefs.OpCode;
import org.apache.zookeeper.server.DataTree;
import org.apache.zookeeper.server.ZooTrace;
import org.apache.zookeeper.txn.CreateSessionTxn;
import org.apache.zookeeper.txn.CreateTxn;
import org.apache.zookeeper.txn.CreateTxnV0;
import org.apache.zookeeper.txn.DeleteTxn;
import org.apache.zookeeper.txn.ErrorTxn;
import org.apache.zookeeper.txn.SetACLTxn;
import org.apache.zookeeper.txn.SetDataTxn;
import org.apache.zookeeper.txn.TxnHeader;
import org.apache.zookeeper.txn.MultiTxn;
public class SerializeUtils {
private static final Logger LOG = LoggerFactory.getLogger(SerializeUtils.class);
public static Record deserializeTxn(byte txnBytes[], TxnHeader hdr)
throws IOException {
final ByteArrayInputStream bais = new ByteArrayInputStream(txnBytes);
InputArchive ia = BinaryInputArchive.getArchive(bais);
hdr.deserialize(ia, "hdr");
bais.mark(bais.available());
Record txn = null;
switch (hdr.getType()) {
case OpCode.createSession:
// This isn't really an error txn; it just has the same
// format. The error represents the timeout
txn = new CreateSessionTxn();
break;
case OpCode.closeSession:
return null;
case OpCode.create:
case OpCode.create2:
txn = new CreateTxn();
break;
case OpCode.delete:
txn = new DeleteTxn();
break;
case OpCode.reconfig:
case OpCode.setData:
txn = new SetDataTxn();
break;
case OpCode.setACL:
txn = new SetACLTxn();
break;
case OpCode.error:
txn = new ErrorTxn();
break;
case OpCode.multi:
txn = new MultiTxn();
break;
default:
throw new IOException("Unsupported Txn with type=%d" + hdr.getType());
}
if (txn != null) {
try {
txn.deserialize(ia, "txn");
} catch(EOFException e) {
// perhaps this is a V0 Create
if (hdr.getType() == OpCode.create) {
CreateTxn create = (CreateTxn)txn;
bais.reset();
CreateTxnV0 createv0 = new CreateTxnV0();
createv0.deserialize(ia, "txn");
// cool now make it V1. a -1 parentCVersion will
// trigger fixup processing in processTxn
create.setPath(createv0.getPath());
create.setData(createv0.getData());
create.setAcl(createv0.getAcl());
create.setEphemeral(createv0.getEphemeral());
create.setParentCVersion(-1);
} else {
throw e;
}
}
}
return txn;
}
public static void deserializeSnapshot(DataTree dt,InputArchive ia,
Map<Long, Integer> sessions) throws IOException {
int count = ia.readInt("count");
while (count > 0) {
long id = ia.readLong("id");
int to = ia.readInt("timeout");
sessions.put(id, to);
if (LOG.isTraceEnabled()) {
ZooTrace.logTraceMessage(LOG, ZooTrace.SESSION_TRACE_MASK,
"loadData --- session in archive: " + id
+ " with timeout: " + to);
}
count--;
}
dt.deserialize(ia, "tree");
}
public static void serializeSnapshot(DataTree dt,OutputArchive oa,
Map<Long, Integer> sessions) throws IOException {
HashMap<Long, Integer> sessSnap = new HashMap<Long, Integer>(sessions);
oa.writeInt(sessSnap.size(), "count");
for (Entry<Long, Integer> entry : sessSnap.entrySet()) {
oa.writeLong(entry.getKey().longValue(), "id");
oa.writeInt(entry.getValue().intValue(), "timeout");
}
dt.serialize(oa, "tree");
}
}