org.springframework.boot.devtools.remote.client.ClassPathChangeUploader.java Source code

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Here is the source code for org.springframework.boot.devtools.remote.client.ClassPathChangeUploader.java

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/*
 * 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.
 */

package org.springframework.boot.devtools.remote.client;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectOutputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Collections;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import org.springframework.boot.devtools.classpath.ClassPathChangedEvent;
import org.springframework.boot.devtools.filewatch.ChangedFile;
import org.springframework.boot.devtools.filewatch.ChangedFiles;
import org.springframework.boot.devtools.restart.classloader.ClassLoaderFile;
import org.springframework.boot.devtools.restart.classloader.ClassLoaderFile.Kind;
import org.springframework.boot.devtools.restart.classloader.ClassLoaderFiles;
import org.springframework.context.ApplicationListener;
import org.springframework.http.HttpHeaders;
import org.springframework.http.HttpMethod;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.client.ClientHttpRequest;
import org.springframework.http.client.ClientHttpRequestFactory;
import org.springframework.http.client.ClientHttpResponse;
import org.springframework.util.Assert;
import org.springframework.util.FileCopyUtils;

/**
 * Listens and pushes any classpath updates to a remote endpoint.
 *
 * @author Phillip Webb
 * @since 1.3.0
 */
public class ClassPathChangeUploader implements ApplicationListener<ClassPathChangedEvent> {

    private static final Map<ChangedFile.Type, ClassLoaderFile.Kind> TYPE_MAPPINGS;

    static {
        Map<ChangedFile.Type, ClassLoaderFile.Kind> map = new HashMap<ChangedFile.Type, ClassLoaderFile.Kind>();
        map.put(ChangedFile.Type.ADD, ClassLoaderFile.Kind.ADDED);
        map.put(ChangedFile.Type.DELETE, ClassLoaderFile.Kind.DELETED);
        map.put(ChangedFile.Type.MODIFY, ClassLoaderFile.Kind.MODIFIED);
        TYPE_MAPPINGS = Collections.unmodifiableMap(map);
    }

    private static final Log logger = LogFactory.getLog(ClassPathChangeUploader.class);

    private final URI uri;

    private final ClientHttpRequestFactory requestFactory;

    public ClassPathChangeUploader(String url, ClientHttpRequestFactory requestFactory) {
        Assert.hasLength(url, "URL must not be empty");
        Assert.notNull(requestFactory, "RequestFactory must not be null");
        try {
            this.uri = new URL(url).toURI();
        } catch (URISyntaxException ex) {
            throw new IllegalArgumentException("Malformed URL '" + url + "'");
        } catch (MalformedURLException ex) {
            throw new IllegalArgumentException("Malformed URL '" + url + "'");
        }
        this.requestFactory = requestFactory;
    }

    @Override
    public void onApplicationEvent(ClassPathChangedEvent event) {
        try {
            ClassLoaderFiles classLoaderFiles = getClassLoaderFiles(event);
            ClientHttpRequest request = this.requestFactory.createRequest(this.uri, HttpMethod.POST);
            byte[] bytes = serialize(classLoaderFiles);
            HttpHeaders headers = request.getHeaders();
            headers.setContentType(MediaType.APPLICATION_OCTET_STREAM);
            headers.setContentLength(bytes.length);
            FileCopyUtils.copy(bytes, request.getBody());
            logUpload(classLoaderFiles);
            ClientHttpResponse response = request.execute();
            Assert.state(response.getStatusCode() == HttpStatus.OK,
                    "Unexpected " + response.getStatusCode() + " response uploading class files");
        } catch (IOException ex) {
            throw new IllegalStateException(ex);
        }
    }

    private void logUpload(ClassLoaderFiles classLoaderFiles) {
        int size = classLoaderFiles.size();
        logger.info("Uploaded " + size + " class " + (size == 1 ? "resource" : "resources"));
    }

    private byte[] serialize(ClassLoaderFiles classLoaderFiles) throws IOException {
        ByteArrayOutputStream outputStream = new ByteArrayOutputStream();
        ObjectOutputStream objectOutputStream = new ObjectOutputStream(outputStream);
        objectOutputStream.writeObject(classLoaderFiles);
        objectOutputStream.close();
        return outputStream.toByteArray();
    }

    private ClassLoaderFiles getClassLoaderFiles(ClassPathChangedEvent event) throws IOException {
        ClassLoaderFiles files = new ClassLoaderFiles();
        for (ChangedFiles changedFiles : event.getChangeSet()) {
            String sourceFolder = changedFiles.getSourceFolder().getAbsolutePath();
            for (ChangedFile changedFile : changedFiles) {
                files.addFile(sourceFolder, changedFile.getRelativeName(), asClassLoaderFile(changedFile));
            }
        }
        return files;
    }

    private ClassLoaderFile asClassLoaderFile(ChangedFile changedFile) throws IOException {
        ClassLoaderFile.Kind kind = TYPE_MAPPINGS.get(changedFile.getType());
        byte[] bytes = (kind == Kind.DELETED ? null : FileCopyUtils.copyToByteArray(changedFile.getFile()));
        long lastModified = (kind == Kind.DELETED ? System.currentTimeMillis()
                : changedFile.getFile().lastModified());
        return new ClassLoaderFile(kind, lastModified, bytes);
    }

}