RemoteTileLoader.java

package com.android.lib.map.osm;


import com.android.lib.map.osm.models.MapTile;

import android.os.Handler;
import android.os.Message;

public class RemoteTileLoader extends Thread {
		
	private RequestsQueue mRequestsQueue;
	private Handler mHandler;
	private RequestTile mRequestTile;
	

	public RemoteTileLoader(Handler handler, int tileStackSizeLimit) {
		mHandler = handler;
		mRequestsQueue = new RequestsQueue(1, tileStackSizeLimit);
		mRequestTile = new RequestTile();
		start();
	}

	public void queueTileRequest(Tile tile) {
		//Log.i("AddedToQueue", "x= " +tile.mapX+ " y=" +tile.mapY+ " zoom=" + tile.zoom + " mapTypeId=" + tile.mapTypeId + " ADDED TO QUEUE!");
		mRequestsQueue.queue(tile);
		//Log.i("AddedToQueue", "ADDED TOQUEUE size= " + mRequestsQueue.size() + " time=" + (Calendar.getInstance().getTimeInMillis() - time) + "ms");
		synchronized (this) {
			this.notify();
		}
	}

	private boolean loadTile(Tile tile) {
		if (tile == null || tile.key == null) {
			return false;
		}
		try {			
			byte[] bitmapData = mRequestTile.loadBitmap(tile);
			if (bitmapData == null || bitmapData.length == 0)
				return false;
			
			addTile(tile, bitmapData);
			return true;
		} catch (Exception e) {

		}
		return false;
	}
	
	
	public void addTile(Tile tile, final byte[] bitmapData) {
		if (tile == null || bitmapData == null || bitmapData.length == 0) {
			return;
		}
		MapTile.insertTile(tile, bitmapData);
	}
	
	@Override
	public void run() {
		Tile tile;

		while (true) {
			tile = null;
			if (mRequestsQueue.hasRequest()) {
				tile = mRequestsQueue.dequeue();
			}
			if (tile != null) {
				boolean loadTileSuccess = loadTile(tile);
				
				Message message = mHandler.obtainMessage();
				message.arg1 = mRequestsQueue.size();
				message.arg2 = mRequestsQueue.id;
				
				if (loadTileSuccess)
					message.what = TileHandler.TILE_LOADED;
				else
					message.what = TileHandler.TILE_NOT_LOADED;
				mHandler.sendMessage(message);
			}
			try {
				synchronized (this) {
					if (mRequestsQueue.size() == 0) {
						this.wait();
					}
				}
				Thread.sleep(150);
			} catch (InterruptedException e) {
				break;
			}
		}
	}
}