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/*
* Copyright (C) 2011 The Android Open Source Project
*
* Licensed 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.android.providers.downloads;
import android.content.res.Resources;
import android.util.Log;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Iterator;
import java.util.LinkedHashMap;
public class DownloadHandler {
private static final String TAG = "DownloadHandler";
private final LinkedHashMap<Long, DownloadInfo> mDownloadsQueue =
new LinkedHashMap<Long, DownloadInfo>();
private final HashMap<Long, DownloadInfo> mDownloadsInProgress =
new HashMap<Long, DownloadInfo>();
private static final DownloadHandler mDownloadHandler = new DownloadHandler();
private final int mMaxConcurrentDownloadsAllowed = Resources.getSystem().getInteger(
com.android.internal.R.integer.config_MaxConcurrentDownloadsAllowed);
static DownloadHandler getInstance() {
return mDownloadHandler;
}
synchronized void enqueueDownload(DownloadInfo info) {
if (!mDownloadsQueue.containsKey(info.mId)) {
if (Constants.LOGV) {
Log.i(TAG, "enqueued download. id: " + info.mId + ", uri: " + info.mUri);
}
mDownloadsQueue.put(info.mId, info);
startDownloadThread();
}
}
private synchronized void startDownloadThread() {
Iterator<Long> keys = mDownloadsQueue.keySet().iterator();
ArrayList<Long> ids = new ArrayList<Long>();
while (mDownloadsInProgress.size() < mMaxConcurrentDownloadsAllowed && keys.hasNext()) {
Long id = keys.next();
DownloadInfo info = mDownloadsQueue.get(id);
info.startDownloadThread();
ids.add(id);
mDownloadsInProgress.put(id, mDownloadsQueue.get(id));
if (Constants.LOGV) {
Log.i(TAG, "started download for : " + id);
}
}
for (Long id : ids) {
mDownloadsQueue.remove(id);
}
}
synchronized boolean hasDownloadInQueue(long id) {
return mDownloadsQueue.containsKey(id) || mDownloadsInProgress.containsKey(id);
}
synchronized void dequeueDownload(long mId) {
mDownloadsInProgress.remove(mId);
startDownloadThread();
if (mDownloadsInProgress.size() == 0 && mDownloadsQueue.size() == 0) {
notifyAll();
}
}
// right now this is only used by tests. but there is no reason why it can't be used
// by any module using DownloadManager (TODO add API to DownloadManager.java)
public synchronized void WaitUntilDownloadsTerminate() throws InterruptedException {
if (mDownloadsInProgress.size() == 0 && mDownloadsQueue.size() == 0) {
if (Constants.LOGVV) {
Log.i(TAG, "nothing to wait on");
}
return;
}
if (Constants.LOGVV) {
for (DownloadInfo info : mDownloadsInProgress.values()) {
Log.i(TAG, "** progress: " + info.mId + ", " + info.mUri);
}
for (DownloadInfo info : mDownloadsQueue.values()) {
Log.i(TAG, "** in Q: " + info.mId + ", " + info.mUri);
}
}
if (Constants.LOGVV) {
Log.i(TAG, "waiting for 5 sec");
}
// wait upto 5 sec
wait(5 * 1000);
}
}
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