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Remove DecryptionResource

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Reference count was built into DrmSession

PiperOrigin-RevId: 250449988
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aquilescanta 2019-05-29 10:12:27 +01:00 committed by Toni
parent 8a0fb6b78f
commit 8912db5ed9
1 changed files with 0 additions and 72 deletions
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72
library/core/src/main/java/com/google/android/exoplayer2/drm/DecryptionResource.java
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@ -1,72 +0,0 @@
/*
* Copyright (C) 2019 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.google.android.exoplayer2.drm;
/**
* A reference-counted resource used in the decryption of media samples.
*
* @param <T> The reference type with which to make {@link Owner#onLastReferenceReleased} calls.
* Subclasses are expected to pass themselves.
*/
public abstract class DecryptionResource<T extends DecryptionResource<T>> {
/**
* Implemented by the class in charge of managing a {@link DecryptionResource resource's}
* lifecycle.
*/
public interface Owner<T extends DecryptionResource<T>> {
/**
* Called when the last reference to a {@link DecryptionResource} is {@link #releaseReference()
* released}.
*/
void onLastReferenceReleased(T resource);
}
// TODO: Consider adding a handler on which the owner should be called.
private final DecryptionResource.Owner<T> owner;
private int referenceCount;
/**
* Creates a new instance with reference count zero.
*
* @param owner The owner of this instance.
*/
public DecryptionResource(Owner<T> owner) {
this.owner = owner;
referenceCount = 0;
}
/** Increases by one the reference count for this resource. */
public void acquireReference() {
referenceCount++;
}
/**
* Decreases by one the reference count for this resource, and notifies the owner if said count
* reached zero as a result of this operation.
*
* <p>Must only be called as releasing counter-part of {@link #acquireReference()}.
*/
@SuppressWarnings("unchecked")
public void releaseReference() {
if (--referenceCount == 0) {
owner.onLastReferenceReleased((T) this);
} else if (referenceCount < 0) {
throw new IllegalStateException("Illegal release of resource.");
}
}
}