brfrn169 commented on a change in pull request #476: HBASE-11062 hbtop URL: https://github.com/apache/hbase/pull/476#discussion_r318120860
########## File path: hbase-hbtop/src/main/java/org/apache/hadoop/hbase/hbtop/screen/top/TopScreenPresenter.java ########## @@ -0,0 +1,331 @@ +/** + * Licensed to the Apache Software Foundation (ASF) under one + * or more contributor license agreements. See the NOTICE file + * distributed with this work for additional information + * regarding copyright ownership. The ASF licenses this file + * to you 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.apache.hadoop.hbase.hbtop.screen.top; + +import java.util.ArrayList; +import java.util.EnumMap; +import java.util.List; +import java.util.Objects; +import java.util.concurrent.atomic.AtomicBoolean; +import java.util.concurrent.atomic.AtomicLong; +import java.util.stream.Collectors; +import org.apache.hadoop.hbase.hbtop.Record; +import org.apache.hadoop.hbase.hbtop.field.Field; +import org.apache.hadoop.hbase.hbtop.field.FieldInfo; +import org.apache.hadoop.hbase.hbtop.mode.Mode; +import org.apache.hadoop.hbase.hbtop.screen.Screen; +import org.apache.hadoop.hbase.hbtop.screen.ScreenView; +import org.apache.hadoop.hbase.hbtop.screen.field.FieldScreenView; +import org.apache.hadoop.hbase.hbtop.screen.help.HelpScreenView; +import org.apache.hadoop.hbase.hbtop.screen.mode.ModeScreenView; +import org.apache.hadoop.hbase.hbtop.terminal.Terminal; +import org.apache.hadoop.hbase.hbtop.terminal.TerminalSize; +import org.apache.yetus.audience.InterfaceAudience; + + +/** + * The presentation logic for the top screen. + */ [email protected] +public class TopScreenPresenter { + private final TopScreenView topScreenView; + private final AtomicLong refreshDelay; + private long lastRefreshTimestamp; + + private final AtomicBoolean adjustFieldLength = new AtomicBoolean(true); + private final TopScreenModel topScreenModel; + private int terminalLength; + private int horizontalScroll; + private final Paging paging = new Paging(); + + private final EnumMap<Field, Boolean> fieldDisplayMap = new EnumMap<>(Field.class); + private final EnumMap<Field, Integer> fieldLengthMap = new EnumMap<>(Field.class); + + public TopScreenPresenter(TopScreenView topScreenView, long initialRefreshDelay, + TopScreenModel topScreenModel) { + this.topScreenView = Objects.requireNonNull(topScreenView); + this.refreshDelay = new AtomicLong(initialRefreshDelay); + this.topScreenModel = Objects.requireNonNull(topScreenModel); + + initFieldDisplayMapAndFieldLengthMap(); + } + + public void init() { + terminalLength = topScreenView.getTerminalSize().getColumns(); + paging.updatePageSize(topScreenView.getPageSize()); + topScreenView.hideCursor(); + } + + public long refresh(boolean force) { + if (!force) { + long delay = System.currentTimeMillis() - lastRefreshTimestamp; + if (delay < refreshDelay.get()) { + return refreshDelay.get() - delay; + } + } + + TerminalSize newTerminalSize = topScreenView.doResizeIfNecessary(); + if (newTerminalSize != null) { + terminalLength = newTerminalSize.getColumns(); + paging.updatePageSize(topScreenView.getPageSize()); + topScreenView.clearTerminal(); + } + + topScreenModel.refreshMetricsData(); + paging.updateRecordsSize(topScreenModel.getRecords().size()); + + adjustFieldLengthIfNeeded(); + + topScreenView.showTopScreen(topScreenModel.getSummary(), getDisplayedHeaders(), + getDisplayedRecords(), getSelectedRecord()); + + topScreenView.refreshTerminal(); + + lastRefreshTimestamp = System.currentTimeMillis(); + return refreshDelay.get(); + } + + public void adjustFieldLength() { + adjustFieldLength.set(true); + refresh(true); + } + + private void adjustFieldLengthIfNeeded() { + if (adjustFieldLength.get()) { + adjustFieldLength.set(false); + + for (Field f : topScreenModel.getFields()) { + if (f.isAutoAdjust()) { + int maxLength = topScreenModel.getRecords().stream() + .map(r -> r.get(f).asString().length()) + .max(Integer::compareTo).orElse(0); + fieldLengthMap.put(f, Math.max(maxLength, f.getHeader().length())); + } + } + } + } + + private List<Header> getDisplayedHeaders() { + List<Field> displayFields = + topScreenModel.getFields().stream() + .filter(fieldDisplayMap::get).collect(Collectors.toList()); + + if (displayFields.isEmpty()) { + horizontalScroll = 0; + } else if (horizontalScroll > displayFields.size() - 1) { + horizontalScroll = displayFields.size() - 1; + } + + List<Header> ret = new ArrayList<>(); + + int length = 0; + for (int i = horizontalScroll; i < displayFields.size(); i++) { + Field field = displayFields.get(i); + int fieldLength = fieldLengthMap.get(field); + + length += fieldLength + 1; + if (length > terminalLength) { + break; + } + ret.add(new Header(field, fieldLength)); + } + + return ret; + } + + private List<Record> getDisplayedRecords() { + List<Record> ret = new ArrayList<>(); + for (int i = paging.getPageStartPosition(); i < paging.getPageEndPosition(); i++) { + ret.add(topScreenModel.getRecords().get(i)); + } + return ret; + } + + private Record getSelectedRecord() { + if (topScreenModel.getRecords().isEmpty()) { + return null; + } + return topScreenModel.getRecords().get(paging.getCurrentPosition()); + } + + public void arrowUp() { + paging.arrowUp(); + refresh(true); + } + + public void arrowDown() { + paging.arrowDown(); + refresh(true); + } + + public void pageUp() { + paging.pageUp(); + refresh(true); + } + + public void pageDown() { + paging.pageDown(); + refresh(true); + } + + public void arrowLeft() { + if (horizontalScroll > 0) { + horizontalScroll -= 1; + } + refresh(true); + } + + public void arrowRight() { + if (horizontalScroll < getHeaderSize() - 1) { + horizontalScroll += 1; + } + refresh(true); + } + + public void home() { + if (horizontalScroll > 0) { + horizontalScroll = 0; + } + refresh(true); + } + + public void end() { + int headerSize = getHeaderSize(); + horizontalScroll = headerSize == 0 ? 0 : headerSize - 1; + refresh(true); + } + + private int getHeaderSize() { + return (int) topScreenModel.getFields().stream() + .filter(fieldDisplayMap::get).count(); + } + + public void switchSortOrder() { + topScreenModel.switchSortOrder(); + refresh(true); + } + + public ScreenView transitionToHelpScreen(Screen screen, Terminal terminal) { + return new HelpScreenView(screen, terminal, refreshDelay.get(), topScreenView); + } + + public ScreenView transitionToModeScreen(Screen screen, Terminal terminal) { + return new ModeScreenView(screen, terminal, topScreenModel.getCurrentMode(), this::switchMode, + topScreenView); + } + + public ScreenView transitionToFieldScreen(Screen screen, Terminal terminal) { + return new FieldScreenView(screen, terminal, + topScreenModel.getCurrentSortField(), topScreenModel.getFields(), + fieldDisplayMap, + (sortKey, fields, fieldDisplayMap) -> { + topScreenModel.setSortFieldAndFields(sortKey, fields); + this.fieldDisplayMap.clear(); + this.fieldDisplayMap.putAll(fieldDisplayMap); + } + , topScreenView); Review comment: I fixed that. 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