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Support embedded jar initialization scripts
Update the Maven and Gradle plugin to generate fully executable jar files on Unix like machines. A launcher bash script is added to the front of the jar file which handles execution. The default execution script will either launch the application or handle init.d service operations (start/stop/restart) depending on if the application is executed directly, or via a symlink to init.d. See gh-1117
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111 changes: 111 additions & 0 deletions
111
...loader-tools/src/main/java/org/springframework/boot/loader/tools/DefaultLaunchScript.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /* | ||
| * Copyright 2012-2015 the original author or authors. | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package org.springframework.boot.loader.tools; | ||
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| import java.io.ByteArrayOutputStream; | ||
| import java.io.File; | ||
| import java.io.FileInputStream; | ||
| import java.io.IOException; | ||
| import java.io.InputStream; | ||
| import java.io.OutputStream; | ||
| import java.nio.charset.Charset; | ||
| import java.util.Map; | ||
| import java.util.regex.Matcher; | ||
| import java.util.regex.Pattern; | ||
|
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| /** | ||
| * Default implementation of {@link LaunchScript}. Provides the default Spring Boot launch | ||
| * script or can load a specific script File. Also support mustache style template | ||
| * expansion of the form <code>{{name:default}}</code>. | ||
| * | ||
| * @author Phillip Webb | ||
| * @since 1.3.0 | ||
| */ | ||
| public class DefaultLaunchScript implements LaunchScript { | ||
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| private static final Charset UTF_8 = Charset.forName("UTF-8"); | ||
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| private static final int BUFFER_SIZE = 4096; | ||
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| private static final Pattern PLACEHOLDER_PATTERN = Pattern | ||
| .compile("\\{\\{(\\w+)(:.*?)?\\}\\}"); | ||
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| private final String content; | ||
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| /** | ||
| * Create a new {@link DefaultLaunchScript} instance. | ||
| * @param file the source script file or {@code null} to use the default | ||
| * @param properties an optional set of script properties used for variable expansion | ||
| * @throws IOException if the script cannot be loaded | ||
| */ | ||
| public DefaultLaunchScript(File file, Map<?, ?> properties) throws IOException { | ||
| String content = loadContent(file); | ||
| this.content = expandPlaceholders(content, properties); | ||
| } | ||
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| private String loadContent(File file) throws IOException { | ||
| if (file == null) { | ||
| return loadContent(getClass().getResourceAsStream("launch.script")); | ||
| } | ||
| return loadContent(new FileInputStream(file)); | ||
| } | ||
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| private String loadContent(InputStream inputStream) throws IOException { | ||
| try { | ||
| ByteArrayOutputStream outputStream = new ByteArrayOutputStream(); | ||
| copy(inputStream, outputStream); | ||
| return new String(outputStream.toByteArray(), UTF_8); | ||
| } | ||
| finally { | ||
| inputStream.close(); | ||
| } | ||
| } | ||
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| private void copy(InputStream inputStream, OutputStream outputStream) | ||
| throws IOException { | ||
| byte[] buffer = new byte[BUFFER_SIZE]; | ||
| int bytesRead = -1; | ||
| while ((bytesRead = inputStream.read(buffer)) != -1) { | ||
| outputStream.write(buffer, 0, bytesRead); | ||
| } | ||
| outputStream.flush(); | ||
| } | ||
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| private String expandPlaceholders(String content, Map<?, ?> properties) { | ||
| StringBuffer expanded = new StringBuffer(); | ||
| Matcher matcher = PLACEHOLDER_PATTERN.matcher(content); | ||
| while (matcher.find()) { | ||
| String name = matcher.group(1); | ||
| String value = matcher.group(2); | ||
| if (properties != null && properties.containsKey(name)) { | ||
| value = (String) properties.get(name); | ||
| } | ||
| else { | ||
| value = (value == null ? matcher.group(0) : value.substring(1)); | ||
| } | ||
| matcher.appendReplacement(expanded, value); | ||
| } | ||
| matcher.appendTail(expanded); | ||
| return expanded.toString(); | ||
| } | ||
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| @Override | ||
| public byte[] toByteArray() { | ||
| return this.content.getBytes(UTF_8); | ||
| } | ||
|
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| } |
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33 changes: 33 additions & 0 deletions
33
...g-boot-loader-tools/src/main/java/org/springframework/boot/loader/tools/LaunchScript.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,33 @@ | ||
| /* | ||
| * Copyright 2012-2015 the original author or authors. | ||
| * | ||
| * 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. | ||
| */ | ||
|
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| package org.springframework.boot.loader.tools; | ||
|
|
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| /** | ||
| * A script that can be prepended to the front of a JAR file to make it executable. | ||
| * | ||
| * @author Phillip Webb | ||
| * @since 1.3.0 | ||
| */ | ||
| public interface LaunchScript { | ||
|
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| /** | ||
| * The the content of the launch script as a byte array. | ||
| * @return the script bytes | ||
| */ | ||
| byte[] toByteArray(); | ||
|
|
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| } |
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