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.../hg-store-node/src/main/java/org/apache/hugegraph/store/node/metrics/ProcFileHandler.java
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| /* | ||
| * 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.hugegraph.store.node.metrics; | ||
|
|
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| import static java.util.Locale.ENGLISH; | ||
|
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| import java.io.IOException; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.nio.file.Paths; | ||
| import java.util.Collections; | ||
| import java.util.HashMap; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.Objects; | ||
|
|
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| import lombok.Getter; | ||
|
|
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| class ProcFileHandler { | ||
|
|
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| // Cache duration in milliseconds | ||
| private static final long CACHE_DURATION_MS = 100; | ||
| // Singleton instances of ProcFileHandler | ||
| private static final Map<String, ProcFileHandler> handlerInstances = new HashMap<>(); | ||
| private static final Object handlerLock = new Object(); | ||
| // Cached data | ||
| private static final Map<Path, List<String>> cachedContent = new HashMap<>(); | ||
| private static final Object contentLock = new Object(); | ||
| // Base path for proc filesystem | ||
| private static final Path PROC_BASE_PATH = Paths.get("/proc", "self"); | ||
| private final Path filePath; | ||
| private final boolean isOSSupported; | ||
| private long lastReadTimestamp = -1; | ||
|
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| // Private constructor to initialize the handler | ||
| private ProcFileHandler(String entry) { | ||
| this(PROC_BASE_PATH, entry, false); | ||
| } | ||
|
|
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| // Package-private constructor for testing | ||
| ProcFileHandler(Path base, String entry) { | ||
| this(base, entry, true); | ||
| } | ||
|
|
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| // Private constructor with an OS support flag | ||
| private ProcFileHandler(Path base, String entry, boolean forceOSSupport) { | ||
| Objects.requireNonNull(base); | ||
| Objects.requireNonNull(entry); | ||
|
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| this.filePath = base.resolve(entry); | ||
| this.isOSSupported = forceOSSupport || | ||
| System.getProperty("os.name").toLowerCase(ENGLISH).startsWith("linux"); | ||
| } | ||
|
|
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| // Get an instance of ProcFileHandler | ||
| static ProcFileHandler getInstance(String key) { | ||
| Objects.requireNonNull(key); | ||
|
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| synchronized (handlerLock) { | ||
| ProcFileHandler handler = handlerInstances.get(key); | ||
| if (handler == null) { | ||
| handler = new ProcFileHandler(key); | ||
| handlerInstances.put(key, handler); | ||
| } | ||
| return handler; | ||
| } | ||
| } | ||
|
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| // Get the file path | ||
| Path getFilePath() { | ||
| return filePath; | ||
| } | ||
|
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| // Read the proc file | ||
| ReadResult readFile() throws IOException { | ||
| return readFile(currentTimeMillis()); | ||
| } | ||
|
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| // Read the proc file with a specific time | ||
| ReadResult readFile(long currentTimeMillis) throws IOException { | ||
| synchronized (contentLock) { | ||
| final Path key = getFilePath().getFileName(); | ||
|
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| final ReadResult readResult; | ||
| if (lastReadTimestamp == -1 || | ||
| lastReadTimestamp + CACHE_DURATION_MS < currentTimeMillis) { | ||
| final List<String> lines = readFilePath(filePath); | ||
| cacheContent(key, lines); | ||
| lastReadTimestamp = currentTimeMillis(); | ||
| readResult = new ReadResult(lines, lastReadTimestamp); | ||
| } else { | ||
| readResult = new ReadResult(cachedContent.get(key), lastReadTimestamp); | ||
| } | ||
| return readResult; | ||
| } | ||
| } | ||
|
|
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| // Read the content of the path | ||
| List<String> readFilePath(Path path) throws IOException { | ||
| Objects.requireNonNull(path); | ||
|
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| if (!isOSSupported) { | ||
| return Collections.emptyList(); | ||
| } | ||
| return Files.readAllLines(path); | ||
| } | ||
|
|
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| // Cache the result | ||
| void cacheContent(Path key, List<String> lines) { | ||
| Objects.requireNonNull(key); | ||
| Objects.requireNonNull(lines); | ||
|
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| cachedContent.put(key, lines); | ||
| } | ||
|
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| // Get the current time in milliseconds | ||
| long currentTimeMillis() { | ||
| return System.currentTimeMillis(); | ||
| } | ||
|
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| // Result of reading the proc file | ||
| @Getter | ||
| static class ReadResult { | ||
|
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| private final List<String> lines; | ||
| private final long readTime; | ||
|
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| ReadResult(List<String> lines, long readTime) { | ||
| this.lines = Objects.requireNonNull(lines); | ||
| this.readTime = readTime; | ||
| } | ||
| } | ||
| } |
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142 changes: 0 additions & 142 deletions
142
...ore/hg-store-node/src/main/java/org/apache/hugegraph/store/node/metrics/ProcfsReader.java
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