BlockedException.java

/*
 * JBoss, Home of Professional Open Source.
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 * 
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * 
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 * 
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

package org.teiid.common.buffer;

import java.util.Arrays;

import org.teiid.core.TeiidComponentException;
import org.teiid.logging.LogConstants;
import org.teiid.logging.LogManager;
import org.teiid.logging.MessageLevel;

/**
 * This exception is thrown if the buffer manager blocks waiting on input during
 * processing.  This is an indication that more data will be available, but is 
 * not currently available.
 */
public class BlockedException extends TeiidComponentException {

    public static final BlockedException INSTANCE = new BlockedException();
    
    public static final BlockedException BLOCKED_ON_MEMORY_EXCEPTION = new BlockedException();

    /**
     * No-arg costructor required by Externalizable semantics
     */
    public BlockedException() {
        super();
    }
    
    public static BlockedException block(Object... msg) {
    	if (LogManager.isMessageToBeRecorded(LogConstants.CTX_BUFFER_MGR, MessageLevel.DETAIL)) {
    		LogManager.logDetail(LogConstants.CTX_BUFFER_MGR, msg); 
    	}
    	return INSTANCE;
    }

	public static BlockedException blockWithTrace(Object... msg) {
		if (LogManager.isMessageToBeRecorded(LogConstants.CTX_BUFFER_MGR, MessageLevel.DETAIL)) {
    		BlockedException be = new BlockedException();
    		if (be.getStackTrace().length > 0) {
    			be.setStackTrace(Arrays.copyOfRange(be.getStackTrace(), 1, Math.max(0, Math.min(8, be.getStackTrace().length))));
    		}    		
    		LogManager.logDetail(LogConstants.CTX_BUFFER_MGR, be, msg); 
    	}
    	return INSTANCE;
	}
    
}