| /* |
| * Copyright (C) 2014 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.camera.one.v2.sharedimagereader.ringbuffer; |
| |
| import com.android.camera.async.BufferQueue; |
| import com.android.camera.async.BufferQueueController; |
| import com.android.camera.async.Lifetime; |
| import com.android.camera.async.Observable; |
| import com.android.camera.one.v2.camera2proxy.ImageProxy; |
| import com.android.camera.one.v2.sharedimagereader.ticketpool.TicketPool; |
| import com.google.common.util.concurrent.MoreExecutors; |
| |
| /* |
| * Creates a dynamic ring buffer of images. |
| * <p> |
| * The ring buffer is implicitly defined by an input and an output. |
| * <p> |
| * The size of the ring-buffer is dictated by how many tickets it can retrieve from the root |
| * ticket pool. As tickets become available, the ring-buffer expands. |
| * <p> |
| * The ring buffer also provides its own ticket pool. When tickets are requested from this pool, |
| * the ring buffer shrinks. |
| * <p> |
| * Images which cannot be held in the ring-buffer are released immediately. |
| */ |
| public class DynamicRingBufferFactory { |
| private final TicketPool mOutputTicketPool; |
| private final BufferQueueController<ImageProxy> mRingBufferInput; |
| private final BufferQueue<ImageProxy> mRingBufferOutput; |
| |
| public DynamicRingBufferFactory(Lifetime lifetime, TicketPool rootTicketPool, |
| final Observable<Integer> maxRingBufferSize) { |
| final DynamicRingBuffer ringBuffer = new DynamicRingBuffer(rootTicketPool); |
| lifetime.add(ringBuffer); |
| lifetime.add(maxRingBufferSize.addCallback(new Runnable() { |
| @Override |
| public void run() { |
| ringBuffer.setMaxSize(Math.max(0, maxRingBufferSize.get())); |
| } |
| }, MoreExecutors.sameThreadExecutor())); |
| ringBuffer.setMaxSize(Math.max(0, maxRingBufferSize.get())); |
| |
| mOutputTicketPool = ringBuffer; |
| mRingBufferInput = ringBuffer; |
| mRingBufferOutput = ringBuffer; |
| } |
| |
| public TicketPool provideTicketPool() { |
| return mOutputTicketPool; |
| } |
| |
| public BufferQueueController<ImageProxy> provideRingBufferInput() { |
| return mRingBufferInput; |
| } |
| |
| public BufferQueue<ImageProxy> provideRingBufferOutput() { |
| return mRingBufferOutput; |
| } |
| } |