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Add --processes to list running Maven builds. #11102
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164 changes: 164 additions & 0 deletions
164
impl/maven-cli/src/main/java/org/apache/maven/cling/invoker/ProcessRuns.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,164 @@ | ||
| /* | ||
| * 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.maven.cling.invoker; | ||
|
|
||
| import java.io.Reader; | ||
| import java.io.Writer; | ||
| import java.nio.charset.StandardCharsets; | ||
| import java.nio.file.DirectoryStream; | ||
| import java.nio.file.Files; | ||
| import java.nio.file.Path; | ||
| import java.nio.file.Paths; | ||
| import java.time.Instant; | ||
| import java.util.Comparator; | ||
| import java.util.Properties; | ||
|
|
||
| public final class ProcessRuns { | ||
|
|
||
| private static final String RUNS_SUBDIR = ".m2/.maven/runs"; | ||
| private static final String FILE_PREFIX = "mvn-"; | ||
| private static final String FILE_SUFFIX = ".properties"; | ||
|
|
||
| private static final String KEY_PID = "pid"; | ||
| private static final String KEY_VERSION = "version"; | ||
| private static final String KEY_WORKDIR = "workDir"; | ||
| private static final String KEY_EXECROOT = "execRoot"; | ||
| private static final String KEY_STARTED = "started"; | ||
|
|
||
| private static Path runsDir() { | ||
| final String home = System.getProperty("user.home", "."); | ||
| return Paths.get(home).resolve(RUNS_SUBDIR); | ||
| } | ||
|
|
||
| private static Path desc(final long pid) { | ||
| return runsDir().resolve(FILE_PREFIX + pid + FILE_SUFFIX); | ||
| } | ||
|
|
||
| public static void install(final long pid, final String version, final Path workDir, final Path execRoot) { | ||
| try { | ||
| Files.createDirectories(runsDir()); | ||
| final Properties p = new Properties(); | ||
| p.setProperty(KEY_PID, Long.toString(pid)); | ||
| p.setProperty(KEY_VERSION, version == null ? "-" : version); | ||
| p.setProperty( | ||
| KEY_WORKDIR, | ||
| workDir == null ? "?" : workDir.toAbsolutePath().toString()); | ||
| p.setProperty( | ||
| KEY_EXECROOT, | ||
| execRoot == null ? "?" : execRoot.toAbsolutePath().toString()); | ||
| p.setProperty(KEY_STARTED, Instant.now().toString()); | ||
| try (Writer w = Files.newBufferedWriter(desc(pid), StandardCharsets.UTF_8)) { | ||
| p.store(w, "mvn run"); | ||
| } | ||
| } catch (final Exception ignored) { | ||
| // best-effort | ||
| } | ||
| } | ||
|
|
||
| public static void uninstall(final long pid) { | ||
| try { | ||
| Files.deleteIfExists(desc(pid)); | ||
| } catch (final Exception ignored) { | ||
| // best-effort | ||
| } | ||
| } | ||
|
|
||
| private static final class Run { | ||
| final long pid; | ||
| final String version; | ||
| final String workDir; | ||
| final String execRoot; | ||
| final String started; | ||
|
|
||
| Run(final long pid, final String version, final String workDir, final String execRoot, final String started) { | ||
| this.pid = pid; | ||
| this.version = version; | ||
| this.workDir = workDir; | ||
| this.execRoot = execRoot; | ||
| this.started = started; | ||
| } | ||
| } | ||
|
|
||
| public static java.util.List<Run> listAlive() { | ||
| final Path dir = runsDir(); | ||
| if (!Files.isDirectory(dir)) { | ||
| return java.util.List.of(); | ||
| } | ||
| final java.util.List<Run> out = new java.util.ArrayList<>(); | ||
| try (DirectoryStream<Path> ds = Files.newDirectoryStream(dir, FILE_PREFIX + "*" + FILE_SUFFIX)) { | ||
| for (final Path f : ds) { | ||
| final Properties p = new Properties(); | ||
| try (Reader r = Files.newBufferedReader(f, StandardCharsets.UTF_8)) { | ||
| p.load(r); | ||
| } | ||
| final long pid = parseLong(p.getProperty(KEY_PID), -1L); | ||
| final boolean alive = pid > 0 | ||
| && ProcessHandle.of(pid).map(ProcessHandle::isAlive).orElse(false); | ||
| if (alive) { | ||
| out.add(new Run( | ||
| pid, | ||
| p.getProperty(KEY_VERSION, "-"), | ||
| p.getProperty(KEY_WORKDIR, "?"), | ||
| p.getProperty(KEY_EXECROOT, "?"), | ||
| p.getProperty(KEY_STARTED, "?"))); | ||
| } else { | ||
| try { | ||
| Files.deleteIfExists(f); | ||
| } catch (final Exception ignored) { | ||
| } | ||
| } | ||
| } | ||
| } catch (final Exception ignored) { | ||
| // return what we gathered | ||
| } | ||
| out.sort(Comparator.comparing((Run r) -> r.started).thenComparingLong(r -> r.pid)); | ||
| return out; | ||
| } | ||
|
|
||
| public static String format(final java.util.List<Run> runs) { | ||
| final String nl = System.lineSeparator(); | ||
| if (runs.isEmpty()) { | ||
| return "No running Maven processes." + nl; | ||
| } | ||
| final StringBuilder sb = new StringBuilder(); | ||
| sb.append(String.format( | ||
| "%-10s %-12s %-24s %-48s %-48s%s", "PID", "VERSION", "STARTED", "WORKDIR", "EXEC_ROOT", nl)); | ||
| for (final Run r : runs) { | ||
| sb.append(String.format( | ||
| "%-10d %-12s %-24s %-48s %-48s%s", | ||
| r.pid, r.version, r.started, ell(r.workDir, 48), ell(r.execRoot, 48), nl)); | ||
| } | ||
| return sb.toString(); | ||
| } | ||
|
|
||
| private static long parseLong(final String s, final long dflt) { | ||
| try { | ||
| return Long.parseLong(s); | ||
| } catch (final Exception e) { | ||
| return dflt; | ||
| } | ||
| } | ||
|
|
||
| private static String ell(final String s, final int max) { | ||
| if (s == null || s.length() <= max) { | ||
| return s == null ? "?" : s; | ||
| } | ||
| return "…" + s.substring(Math.max(0, s.length() - (max - 1))); | ||
| } | ||
| } | ||
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ell->truncateEnd