JournalMetrics.java

package com.bigdata.journal;

/**
 * Simple class to retrieve open journal and thread metrics for
 * debugging purposes.
 */
public class JournalMetrics {
	final AbstractJournal m_jrnl;
	final ThreadGroup m_grp;
	final int m_startupThreads;
	
	public JournalMetrics(final AbstractJournal jrnl) {
		m_jrnl = jrnl;
		m_grp = Thread.currentThread().getThreadGroup();
		m_startupThreads = m_grp.activeCount();
	}
	
	/**
	 * @return a debug string with info on open journals and active threads
	 */
	public String getStatus() {
		final StringBuilder bldr = new StringBuilder();
		
		bldr.append("Open journals: " + m_jrnl.nopen.get() + "\n");
		
		bldr.append("Threads - startup: " + m_startupThreads
				+ ", current: " +  m_grp.activeCount());
		
		return bldr.toString();
	}
 }