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/*
* Copyright (C) 2016 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 org.mozilla.thirdparty.com.google.android.exoplayer2.upstream.cache;
import androidx.annotation.Nullable;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Assertions;
import org.mozilla.thirdparty.com.google.android.exoplayer2.util.Log;
import java.io.File;
import java.util.TreeSet;
/** Defines the cached content for a single stream. */
/* package */ final class CachedContent {
private static final String TAG = "CachedContent";
/** The cache file id that uniquely identifies the original stream. */
public final int id;
/** The cache key that uniquely identifies the original stream. */
public final String key;
/** The cached spans of this content. */
private final TreeSet<SimpleCacheSpan> cachedSpans;
/** Metadata values. */
private DefaultContentMetadata metadata;
/** Whether the content is locked. */
private boolean locked;
/**
* Creates a CachedContent.
*
* @param id The cache file id.
* @param key The cache stream key.
*/
public CachedContent(int id, String key) {
this(id, key, DefaultContentMetadata.EMPTY);
}
public CachedContent(int id, String key, DefaultContentMetadata metadata) {
this.id = id;
this.key = key;
this.metadata = metadata;
this.cachedSpans = new TreeSet<>();
}
/** Returns the metadata. */
public DefaultContentMetadata getMetadata() {
return metadata;
}
/**
* Applies {@code mutations} to the metadata.
*
* @return Whether {@code mutations} changed any metadata.
*/
public boolean applyMetadataMutations(ContentMetadataMutations mutations) {
DefaultContentMetadata oldMetadata = metadata;
metadata = metadata.copyWithMutationsApplied(mutations);
return !metadata.equals(oldMetadata);
}
/** Returns whether the content is locked. */
public boolean isLocked() {
return locked;
}
/** Sets the locked state of the content. */
public void setLocked(boolean locked) {
this.locked = locked;
}
/** Adds the given {@link SimpleCacheSpan} which contains a part of the content. */
public void addSpan(SimpleCacheSpan span) {
cachedSpans.add(span);
}
/** Returns a set of all {@link SimpleCacheSpan}s. */
public TreeSet<SimpleCacheSpan> getSpans() {
return cachedSpans;
}
/**
* Returns the span containing the position. If there isn't one, it returns a hole span
* which defines the maximum extents of the hole in the cache.
*/
public SimpleCacheSpan getSpan(long position) {
SimpleCacheSpan lookupSpan = SimpleCacheSpan.createLookup(key, position);
SimpleCacheSpan floorSpan = cachedSpans.floor(lookupSpan);
if (floorSpan != null && floorSpan.position + floorSpan.length > position) {
return floorSpan;
}
SimpleCacheSpan ceilSpan = cachedSpans.ceiling(lookupSpan);
return ceilSpan == null ? SimpleCacheSpan.createOpenHole(key, position)
: SimpleCacheSpan.createClosedHole(key, position, ceilSpan.position - position);
}
/**
* Returns the length of the cached data block starting from the {@code position} to the block end
* up to {@code length} bytes. If the {@code position} isn't cached then -(the length of the gap
* to the next cached data up to {@code length} bytes) is returned.
*
* @param position The starting position of the data.
* @param length The maximum length of the data to be returned.
* @return the length of the cached or not cached data block length.
*/
public long getCachedBytesLength(long position, long length) {
SimpleCacheSpan span = getSpan(position);
if (span.isHoleSpan()) {
// We don't have a span covering the start of the queried region.
return -Math.min(span.isOpenEnded() ? Long.MAX_VALUE : span.length, length);
}
long queryEndPosition = position + length;
long currentEndPosition = span.position + span.length;
if (currentEndPosition < queryEndPosition) {
for (SimpleCacheSpan next : cachedSpans.tailSet(span, false)) {
if (next.position > currentEndPosition) {
// There's a hole in the cache within the queried region.
break;
}
// We expect currentEndPosition to always equal (next.position + next.length), but
// perform a max check anyway to guard against the existence of overlapping spans.
currentEndPosition = Math.max(currentEndPosition, next.position + next.length);
if (currentEndPosition >= queryEndPosition) {
// We've found spans covering the queried region.
break;
}
}
}
return Math.min(currentEndPosition - position, length);
}
/**
* Sets the given span's last touch timestamp. The passed span becomes invalid after this call.
*
* @param cacheSpan Span to be copied and updated.
* @param lastTouchTimestamp The new last touch timestamp.
* @param updateFile Whether the span file should be renamed to have its timestamp match the new
* last touch time.
* @return A span with the updated last touch timestamp.
*/
public SimpleCacheSpan setLastTouchTimestamp(
SimpleCacheSpan cacheSpan, long lastTouchTimestamp, boolean updateFile) {
Assertions.checkState(cachedSpans.remove(cacheSpan));
File file = cacheSpan.file;
if (updateFile) {
File directory = file.getParentFile();
long position = cacheSpan.position;
File newFile = SimpleCacheSpan.getCacheFile(directory, id, position, lastTouchTimestamp);
if (file.renameTo(newFile)) {
file = newFile;
} else {
Log.w(TAG, "Failed to rename " + file + " to " + newFile);
}
}
SimpleCacheSpan newCacheSpan =
cacheSpan.copyWithFileAndLastTouchTimestamp(file, lastTouchTimestamp);
cachedSpans.add(newCacheSpan);
return newCacheSpan;
}
/** Returns whether there are any spans cached. */
public boolean isEmpty() {
return cachedSpans.isEmpty();
}
/** Removes the given span from cache. */
public boolean removeSpan(CacheSpan span) {
if (cachedSpans.remove(span)) {
span.file.delete();
return true;
}
return false;
}
@Override
public int hashCode() {
int result = id;
result = 31 * result + key.hashCode();
result = 31 * result + metadata.hashCode();
return result;
}
@Override
public boolean equals(@Nullable Object o) {
if (this == o) {
return true;
}
if (o == null || getClass() != o.getClass()) {
return false;
}
CachedContent that = (CachedContent) o;
return id == that.id
&& key.equals(that.key)
&& cachedSpans.equals(that.cachedSpans)
&& metadata.equals(that.metadata);
}
}
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