org.kairosdb.metrics4j.internal.ComponentTracker Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of metrics4j Show documentation

Java library for reporting metrics to any timeseries database.

There is a newer version: 1.0.2

package org.kairosdb.metrics4j.internal;

import org.kairosdb.metrics4j.configuration.MissingReferenceException;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class ComponentTracker
{
	public interface ComponentListener
	{
		void newComponent(String name, T component);
	}

	protected final Map m_components;
	private final Map, T> m_mappedComponents;
	protected final String m_componentType;
	private final List m_listeners;

	public ComponentTracker(String componentType)
	{
		m_componentType = componentType;
		m_components = new HashMap<>();
		m_mappedComponents = new HashMap<>();
		m_listeners = new ArrayList<>();
	}

	public void addToPath(String name, List path)
	{
		T component = m_components.get(name);
		if (component == null)
			throw new MissingReferenceException(m_componentType, name);

		m_mappedComponents.put(path, component);
	}

	public T getComponentForKey(ArgKey key)
	{
		T ret = null;
		List configPath = key.getConfigPath();
		for (int i = configPath.size(); i >= 0; i--)
		{
			List searchPath = new ArrayList<>(configPath.subList(0, i));
			ret = m_mappedComponents.get(searchPath);
			if (ret != null)
				break;
		}

		return ret;
	}

	public void addComponent(String name, T component)
	{
		//maybe a lock on this and addComponentListener
		m_components.put(name, component);
		for (ComponentListener listener : m_listeners)
		{
			listener.newComponent(name, component);
		}
	}

	public T getComponent(String name)
	{
		return m_components.get(name);
	}

	public void addComponentListener(ComponentListener listener)
	{
		for (String name : m_components.keySet())
		{
			listener.newComponent(name, m_components.get(name));
		}
		m_listeners.add(listener);
	}
}