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// 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 com.cloud.cluster;
import java.util.HashMap;
import java.util.Map;
import org.apache.log4j.Logger;
import com.cloud.cluster.dao.StackMaidDao;
import com.cloud.cluster.dao.StackMaidDaoImpl;
import com.cloud.serializer.SerializerHelper;
import com.cloud.utils.CleanupDelegate;
import com.cloud.utils.db.Transaction;
public class StackMaid {
protected final static Logger s_logger = Logger.getLogger(StackMaid.class);
private static ThreadLocal<StackMaid> threadMaid = new ThreadLocal<StackMaid>();
private static long msid_setby_manager = 0;
private StackMaidDao maidDao = new StackMaidDaoImpl();
private int currentSeq = 0;
private Map<String, Object> context = new HashMap<String, Object>();
public static void init(long msid) {
msid_setby_manager = msid;
}
public static StackMaid current() {
StackMaid maid = threadMaid.get();
if(maid == null) {
maid = new StackMaid();
threadMaid.set(maid);
}
return maid;
}
public void registerContext(String key, Object contextObject) {
assert(!context.containsKey(key)) : "Context key has already been registered";
context.put(key, contextObject);
}
public Object getContext(String key) {
return context.get(key);
}
public void expungeMaidItem(long maidId) {
// this is a bit ugly, but when it is not loaded by component locator, this is just a workable way for now
Transaction txn = Transaction.open(Transaction.CLOUD_DB);
try {
maidDao.expunge(maidId);
} finally {
txn.close();
}
}
public int push(String delegateClzName, Object context) {
assert(msid_setby_manager != 0) : "Fatal, make sure StackMaidManager is loaded";
if(msid_setby_manager == 0)
s_logger.error("Fatal, make sure StackMaidManager is loaded");
return push(msid_setby_manager, delegateClzName, context);
}
public int push(long currentMsid, String delegateClzName, Object context) {
int savePoint = currentSeq;
maidDao.pushCleanupDelegate(currentMsid, currentSeq++, delegateClzName, context);
return savePoint;
}
public void pop(int savePoint) {
assert(msid_setby_manager != 0) : "Fatal, make sure StackMaidManager is loaded";
if(msid_setby_manager == 0)
s_logger.error("Fatal, make sure StackMaidManager is loaded");
pop(msid_setby_manager, savePoint);
}
public void pop() {
if(currentSeq > 0)
pop(currentSeq -1);
}
/**
* must be called within thread context
* @param currentMsid
*/
public void pop(long currentMsid, int savePoint) {
while(currentSeq > savePoint) {
maidDao.popCleanupDelegate(currentMsid);
currentSeq--;
}
}
public void exitCleanup() {
exitCleanup(msid_setby_manager);
}
public void exitCleanup(long currentMsid) {
if(currentSeq > 0) {
CheckPointVO maid = null;
while((maid = maidDao.popCleanupDelegate(currentMsid)) != null) {
doCleanup(maid);
}
currentSeq = 0;
}
context.clear();
}
public static boolean doCleanup(CheckPointVO maid) {
if(maid.getDelegate() != null) {
try {
Class<?> clz = Class.forName(maid.getDelegate());
Object delegate = clz.newInstance();
if(delegate instanceof CleanupDelegate) {
return ((CleanupDelegate)delegate).cleanup(SerializerHelper.fromSerializedString(maid.getContext()), maid);
} else {
assert(false);
}
} catch (final ClassNotFoundException e) {
s_logger.error("Unable to load StackMaid delegate class: " + maid.getDelegate(), e);
} catch (final SecurityException e) {
s_logger.error("Security excetion when loading resource: " + maid.getDelegate());
} catch (final IllegalArgumentException e) {
s_logger.error("Illegal argument excetion when loading resource: " + maid.getDelegate());
} catch (final InstantiationException e) {
s_logger.error("Instantiation excetion when loading resource: " + maid.getDelegate());
} catch (final IllegalAccessException e) {
s_logger.error("Illegal access exception when loading resource: " + maid.getDelegate());
}
return false;
}
return true;
}
}