GapWorker.java revision 356880d3de117b067522ad452f4e3eed85ce444c
107b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik/* 207b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * Copyright (C) 2016 The Android Open Source Project 307b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * 407b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * Licensed under the Apache License, Version 2.0 (the "License"); 507b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * you may not use this file except in compliance with the License. 607b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * You may obtain a copy of the License at 707b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * 807b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * http://www.apache.org/licenses/LICENSE-2.0 907b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * 1007b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * Unless required by applicable law or agreed to in writing, software 1107b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * distributed under the License is distributed on an "AS IS" BASIS, 1207b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 1307b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * See the License for the specific language governing permissions and 1407b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * limitations under the License. 1507b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik */ 1607b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craikpackage android.support.v7.widget; 1707b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 1807b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craikimport android.support.v4.os.TraceCompat; 1907b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 2007b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craikimport java.util.ArrayList; 2107b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craikimport java.util.Arrays; 22356880d3de117b067522ad452f4e3eed85ce444cChris Craikimport java.util.Collections; 23356880d3de117b067522ad452f4e3eed85ce444cChris Craikimport java.util.Comparator; 2407b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craikimport java.util.concurrent.TimeUnit; 2507b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 2607b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craikclass GapWorker implements Runnable { 2707b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik static final ThreadLocal<GapWorker> sGapWorker = new ThreadLocal<>(); 2807b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 29356880d3de117b067522ad452f4e3eed85ce444cChris Craik ArrayList<RecyclerView> mRecyclerViews = new ArrayList<>(); 3007b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik long mPostTimeNs; 3107b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik long mFrameIntervalNs; 3207b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 33356880d3de117b067522ad452f4e3eed85ce444cChris Craik static class Task { 34356880d3de117b067522ad452f4e3eed85ce444cChris Craik public boolean immediate; 35356880d3de117b067522ad452f4e3eed85ce444cChris Craik public int viewVelocity; 36356880d3de117b067522ad452f4e3eed85ce444cChris Craik public int distanceToItem; 37356880d3de117b067522ad452f4e3eed85ce444cChris Craik public RecyclerView view; 38356880d3de117b067522ad452f4e3eed85ce444cChris Craik public int position; 39356880d3de117b067522ad452f4e3eed85ce444cChris Craik 40356880d3de117b067522ad452f4e3eed85ce444cChris Craik public void clear() { 41356880d3de117b067522ad452f4e3eed85ce444cChris Craik immediate = false; 42356880d3de117b067522ad452f4e3eed85ce444cChris Craik viewVelocity = 0; 43356880d3de117b067522ad452f4e3eed85ce444cChris Craik distanceToItem = 0; 44356880d3de117b067522ad452f4e3eed85ce444cChris Craik view = null; 45356880d3de117b067522ad452f4e3eed85ce444cChris Craik position = 0; 46356880d3de117b067522ad452f4e3eed85ce444cChris Craik } 47356880d3de117b067522ad452f4e3eed85ce444cChris Craik } 48356880d3de117b067522ad452f4e3eed85ce444cChris Craik 49356880d3de117b067522ad452f4e3eed85ce444cChris Craik /** 50356880d3de117b067522ad452f4e3eed85ce444cChris Craik * Temporary storage for prefetch Tasks that execute in {@link #prefetch(long)}. Task objects 51356880d3de117b067522ad452f4e3eed85ce444cChris Craik * are pooled in the ArrayList, and never removed to avoid allocations, but always cleared 52356880d3de117b067522ad452f4e3eed85ce444cChris Craik * in between calls. 53356880d3de117b067522ad452f4e3eed85ce444cChris Craik */ 54356880d3de117b067522ad452f4e3eed85ce444cChris Craik private ArrayList<Task> mTasks = new ArrayList<>(); 55356880d3de117b067522ad452f4e3eed85ce444cChris Craik 56945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik /** 57945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik * Prefetch information associated with a specfic RecyclerView. 58945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik */ 59945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik static class PrefetchRegistryImpl implements RecyclerView.PrefetchRegistry { 60945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik private int mPrefetchDx; 61945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik private int mPrefetchDy; 62945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik int[] mPrefetchArray; 63945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik 64945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik int mCount; 65945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik 66945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik void setPrefetchVector(int dx, int dy) { 67945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik mPrefetchDx = dx; 68945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik mPrefetchDy = dy; 69945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 70945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik 71945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik void collectPrefetchPositionsFromView(RecyclerView view) { 72945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik mCount = 0; 73945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik if (mPrefetchArray != null) { 74945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik Arrays.fill(mPrefetchArray, -1); 75945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 76945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik 77945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik final RecyclerView.LayoutManager layout = view.mLayout; 78945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik if (view.mAdapter != null 79945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik && layout != null 80945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik && layout.isItemPrefetchEnabled() 81945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik && !view.hasPendingAdapterUpdates()) { 82945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik layout.collectPrefetchPositions(mPrefetchDx, mPrefetchDy, view.mState, this); 83945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik if (mCount > layout.mPrefetchMaxCountObserved) { 84945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik layout.mPrefetchMaxCountObserved = mCount; 85945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik view.mRecycler.updateViewCacheSize(); 86945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 87945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 88945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 89945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik 90945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik @Override 91945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik public void addPosition(int layoutPosition, int pixelDistance) { 92945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik if (pixelDistance < 0) { 93945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik throw new IllegalArgumentException("Pixel distance must be non-negative"); 94945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 95945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik 96945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik // allocate or expand array as needed, doubling when needed 97945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik final int storagePosition = mCount * 2; 98945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik if (mPrefetchArray == null) { 99945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik mPrefetchArray = new int[4]; 100945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik Arrays.fill(mPrefetchArray, -1); 101945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } else if (storagePosition >= mPrefetchArray.length) { 102945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik final int[] oldArray = mPrefetchArray; 103945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik mPrefetchArray = new int[storagePosition * 2]; 104945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik System.arraycopy(oldArray, 0, mPrefetchArray, 0, oldArray.length); 105945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 106945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik 107945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik // add position 108945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik mPrefetchArray[storagePosition] = layoutPosition; 109945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik mPrefetchArray[storagePosition + 1] = pixelDistance; 110945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik 111945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik mCount++; 112945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 113945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik 114945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik boolean lastPrefetchIncludedPosition(int position) { 115945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik if (mPrefetchArray != null) { 116945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik final int count = mCount * 2; 117945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik for (int i = 0; i < count; i += 2) { 118945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik if (mPrefetchArray[i] == position) return true; 119945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 120945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 121945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik return false; 122945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 123945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik 124945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik /** 125945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik * Called when prefetch indices are no longer valid for cache prioritization. 126945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik */ 127945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik void clearPrefetchPositions() { 128945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik if (mPrefetchArray != null) { 129945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik Arrays.fill(mPrefetchArray, -1); 130945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 131945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 132945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 133945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik 13407b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik public void add(RecyclerView recyclerView) { 13507b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik if (RecyclerView.DEBUG && mRecyclerViews.contains(recyclerView)) { 13607b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik throw new IllegalStateException("RecyclerView already present in worker list!"); 13707b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 13807b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik mRecyclerViews.add(recyclerView); 13907b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 14007b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 14107b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik public void remove(RecyclerView recyclerView) { 14207b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik boolean removeSuccess = mRecyclerViews.remove(recyclerView); 14307b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik if (RecyclerView.DEBUG && !removeSuccess) { 14407b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik throw new IllegalStateException("RecyclerView removal failed!"); 14507b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 14607b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 14707b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 14807b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik /** 14907b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik * Schedule a prefetch immediately after the current traversal. 15007b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik */ 15107b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik void postFromTraversal(RecyclerView recyclerView, int prefetchDx, int prefetchDy) { 15207b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik if (recyclerView.isAttachedToWindow()) { 15307b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik if (RecyclerView.DEBUG && !mRecyclerViews.contains(recyclerView)) { 15407b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik throw new IllegalStateException("attempting to post unregistered view!"); 15507b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 15607b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik if (mPostTimeNs == 0) { 157a93a0c08b4543401d8e2df9bd4c88f26d3b72c11Chris Craik mPostTimeNs = recyclerView.getNanoTime(); 15807b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik recyclerView.post(this); 15907b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 16007b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 16107b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 162945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik recyclerView.mPrefetchRegistry.setPrefetchVector(prefetchDx, prefetchDy); 16307b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 16407b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 165356880d3de117b067522ad452f4e3eed85ce444cChris Craik static Comparator<Task> sTaskComparator = new Comparator<Task>() { 166356880d3de117b067522ad452f4e3eed85ce444cChris Craik @Override 167356880d3de117b067522ad452f4e3eed85ce444cChris Craik public int compare(Task lhs, Task rhs) { 168356880d3de117b067522ad452f4e3eed85ce444cChris Craik // first, prioritize non-cleared tasks 169356880d3de117b067522ad452f4e3eed85ce444cChris Craik if ((lhs.view == null) != (rhs.view == null)) { 170356880d3de117b067522ad452f4e3eed85ce444cChris Craik return lhs.view == null ? 1 : -1; 171356880d3de117b067522ad452f4e3eed85ce444cChris Craik } 172356880d3de117b067522ad452f4e3eed85ce444cChris Craik 173356880d3de117b067522ad452f4e3eed85ce444cChris Craik // then prioritize immediate 174356880d3de117b067522ad452f4e3eed85ce444cChris Craik if (lhs.immediate != rhs.immediate) { 175356880d3de117b067522ad452f4e3eed85ce444cChris Craik return lhs.immediate ? -1 : 1; 176356880d3de117b067522ad452f4e3eed85ce444cChris Craik } 177356880d3de117b067522ad452f4e3eed85ce444cChris Craik 178356880d3de117b067522ad452f4e3eed85ce444cChris Craik // then prioritize _highest_ view velocity 179356880d3de117b067522ad452f4e3eed85ce444cChris Craik int deltaViewVelocity = rhs.viewVelocity - lhs.viewVelocity; 180356880d3de117b067522ad452f4e3eed85ce444cChris Craik if (deltaViewVelocity != 0) return deltaViewVelocity; 181356880d3de117b067522ad452f4e3eed85ce444cChris Craik 182356880d3de117b067522ad452f4e3eed85ce444cChris Craik // then prioritize _lowest_ distance to item 183356880d3de117b067522ad452f4e3eed85ce444cChris Craik int deltaDistanceToItem = lhs.distanceToItem - rhs.distanceToItem; 184356880d3de117b067522ad452f4e3eed85ce444cChris Craik if (deltaDistanceToItem != 0) return deltaDistanceToItem; 185356880d3de117b067522ad452f4e3eed85ce444cChris Craik 186356880d3de117b067522ad452f4e3eed85ce444cChris Craik return 0; 187356880d3de117b067522ad452f4e3eed85ce444cChris Craik } 188356880d3de117b067522ad452f4e3eed85ce444cChris Craik }; 189356880d3de117b067522ad452f4e3eed85ce444cChris Craik 190356880d3de117b067522ad452f4e3eed85ce444cChris Craik private void buildTaskList() { 191356880d3de117b067522ad452f4e3eed85ce444cChris Craik // Update PrefetchRegistry in each view 192356880d3de117b067522ad452f4e3eed85ce444cChris Craik final int viewCount = mRecyclerViews.size(); 193356880d3de117b067522ad452f4e3eed85ce444cChris Craik int totalTaskCount = 0; 194356880d3de117b067522ad452f4e3eed85ce444cChris Craik for (int i = 0; i < viewCount; i++) { 195356880d3de117b067522ad452f4e3eed85ce444cChris Craik RecyclerView view = mRecyclerViews.get(i); 196356880d3de117b067522ad452f4e3eed85ce444cChris Craik view.mPrefetchRegistry.collectPrefetchPositionsFromView(view); 197356880d3de117b067522ad452f4e3eed85ce444cChris Craik totalTaskCount += view.mPrefetchRegistry.mCount; 198356880d3de117b067522ad452f4e3eed85ce444cChris Craik } 199356880d3de117b067522ad452f4e3eed85ce444cChris Craik 200356880d3de117b067522ad452f4e3eed85ce444cChris Craik // Populate task list from prefetch data... 201356880d3de117b067522ad452f4e3eed85ce444cChris Craik mTasks.ensureCapacity(totalTaskCount); 202356880d3de117b067522ad452f4e3eed85ce444cChris Craik int totalTaskIndex = 0; 203356880d3de117b067522ad452f4e3eed85ce444cChris Craik for (int i = 0; i < viewCount; i++) { 204356880d3de117b067522ad452f4e3eed85ce444cChris Craik RecyclerView view = mRecyclerViews.get(i); 205356880d3de117b067522ad452f4e3eed85ce444cChris Craik PrefetchRegistryImpl prefetchRegistry = view.mPrefetchRegistry; 206356880d3de117b067522ad452f4e3eed85ce444cChris Craik final int viewVelocity = Math.abs(prefetchRegistry.mPrefetchDx) 207356880d3de117b067522ad452f4e3eed85ce444cChris Craik + Math.abs(prefetchRegistry.mPrefetchDy); 208356880d3de117b067522ad452f4e3eed85ce444cChris Craik for (int j = 0; j < prefetchRegistry.mCount * 2; j += 2) { 209356880d3de117b067522ad452f4e3eed85ce444cChris Craik final Task task; 210356880d3de117b067522ad452f4e3eed85ce444cChris Craik if (totalTaskIndex >= mTasks.size()) { 211356880d3de117b067522ad452f4e3eed85ce444cChris Craik task = new Task(); 212356880d3de117b067522ad452f4e3eed85ce444cChris Craik mTasks.add(task); 213356880d3de117b067522ad452f4e3eed85ce444cChris Craik } else { 214356880d3de117b067522ad452f4e3eed85ce444cChris Craik task = mTasks.get(totalTaskIndex); 215356880d3de117b067522ad452f4e3eed85ce444cChris Craik } 216356880d3de117b067522ad452f4e3eed85ce444cChris Craik final int distanceToItem = prefetchRegistry.mPrefetchArray[j + 1]; 217356880d3de117b067522ad452f4e3eed85ce444cChris Craik 218356880d3de117b067522ad452f4e3eed85ce444cChris Craik task.immediate = distanceToItem <= viewVelocity; 219356880d3de117b067522ad452f4e3eed85ce444cChris Craik task.viewVelocity = viewVelocity; 220356880d3de117b067522ad452f4e3eed85ce444cChris Craik task.distanceToItem = distanceToItem; 221356880d3de117b067522ad452f4e3eed85ce444cChris Craik task.view = view; 222356880d3de117b067522ad452f4e3eed85ce444cChris Craik task.position = prefetchRegistry.mPrefetchArray[j]; 223356880d3de117b067522ad452f4e3eed85ce444cChris Craik 224356880d3de117b067522ad452f4e3eed85ce444cChris Craik totalTaskIndex++; 225356880d3de117b067522ad452f4e3eed85ce444cChris Craik } 226356880d3de117b067522ad452f4e3eed85ce444cChris Craik } 22707b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 228356880d3de117b067522ad452f4e3eed85ce444cChris Craik // ... and priority sort 229356880d3de117b067522ad452f4e3eed85ce444cChris Craik Collections.sort(mTasks, sTaskComparator); 230356880d3de117b067522ad452f4e3eed85ce444cChris Craik } 231a93a0c08b4543401d8e2df9bd4c88f26d3b72c11Chris Craik 232356880d3de117b067522ad452f4e3eed85ce444cChris Craik private void flushTasksWithDeadline(long deadlineNs) { 233356880d3de117b067522ad452f4e3eed85ce444cChris Craik for (int i = 0; i < mTasks.size(); i++) { 234356880d3de117b067522ad452f4e3eed85ce444cChris Craik final Task task = mTasks.get(i); 235356880d3de117b067522ad452f4e3eed85ce444cChris Craik if (task.view == null) { 236356880d3de117b067522ad452f4e3eed85ce444cChris Craik // abort, only empty Tasks left 237356880d3de117b067522ad452f4e3eed85ce444cChris Craik return; 238945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 239a93a0c08b4543401d8e2df9bd4c88f26d3b72c11Chris Craik 240356880d3de117b067522ad452f4e3eed85ce444cChris Craik RecyclerView.Recycler recycler = task.view.mRecycler; 241945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik RecyclerView.ViewHolder holder = recycler.tryGetViewHolderForPositionByDeadline( 242356880d3de117b067522ad452f4e3eed85ce444cChris Craik task.position, false, task.immediate ? RecyclerView.FOREVER_NS : deadlineNs); 243356880d3de117b067522ad452f4e3eed85ce444cChris Craik 244945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik if (holder != null) { 245945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik if (holder.isBound()) { 246945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik // Only give the view a chance to go into the cache if binding succeeded 247945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik recycler.recycleViewHolderInternal(holder); 248945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } else { 249945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik // Didn't bind, so we can't cache the view, but it will stay in the pool until 250945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik // next prefetch/traversal. If a View fails to bind, it means we didn't have 251945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik // enough time prior to the deadline (and won't for other instances of this 252945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik // type, during this GapWorker prefetch pass). 253945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik recycler.addViewHolderToRecycledViewPool(holder); 254945dc1e8a9ee0b71e6b2454ccb3e61145d2132f5Chris Craik } 255a93a0c08b4543401d8e2df9bd4c88f26d3b72c11Chris Craik } 256356880d3de117b067522ad452f4e3eed85ce444cChris Craik task.clear(); 257a93a0c08b4543401d8e2df9bd4c88f26d3b72c11Chris Craik } 25807b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 25907b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 260356880d3de117b067522ad452f4e3eed85ce444cChris Craik 261356880d3de117b067522ad452f4e3eed85ce444cChris Craik void prefetch(long deadlineNs) { 262356880d3de117b067522ad452f4e3eed85ce444cChris Craik buildTaskList(); 263356880d3de117b067522ad452f4e3eed85ce444cChris Craik flushTasksWithDeadline(deadlineNs); 264356880d3de117b067522ad452f4e3eed85ce444cChris Craik } 265356880d3de117b067522ad452f4e3eed85ce444cChris Craik 26607b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik @Override 26707b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik public void run() { 26807b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik try { 26907b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik TraceCompat.beginSection(RecyclerView.TRACE_PREFETCH_TAG); 27007b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 27107b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik if (mRecyclerViews.isEmpty()) { 27207b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik // abort - no work to do 27307b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik return; 27407b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 27507b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 27607b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik // Query last vsync so we can predict next one. Note that drawing time not yet 27707b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik // valid in animation/input callbacks, so query it here to be safe. 278356880d3de117b067522ad452f4e3eed85ce444cChris Craik long lastFrameVsyncNs = TimeUnit.MILLISECONDS.toNanos( 27907b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik mRecyclerViews.get(0).getDrawingTime()); 280356880d3de117b067522ad452f4e3eed85ce444cChris Craik if (lastFrameVsyncNs == 0) { 28107b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik // abort - couldn't get last vsync for estimating next 28207b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik return; 28307b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 28407b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 285a93a0c08b4543401d8e2df9bd4c88f26d3b72c11Chris Craik // TODO: consider rebasing deadline if frame was already dropped due to long UI work. 286a93a0c08b4543401d8e2df9bd4c88f26d3b72c11Chris Craik // Next frame will still wait for VSYNC, so we can still use the gap if it exists. 287356880d3de117b067522ad452f4e3eed85ce444cChris Craik long nextFrameNs = lastFrameVsyncNs + mFrameIntervalNs; 288356880d3de117b067522ad452f4e3eed85ce444cChris Craik 289356880d3de117b067522ad452f4e3eed85ce444cChris Craik prefetch(nextFrameNs); 29007b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik 29107b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik // TODO: consider rescheduling self, if there's more work to do 29207b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } finally { 29307b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik mPostTimeNs = 0; 29407b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik TraceCompat.endSection(); 29507b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 29607b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik } 29707b2e072ee7e8f424eb95abc77695dc2c5a786bbChris Craik} 298