br.com.ingenieux.mojo.jbake.WatchMojo.java Source code

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Here is the source code for br.com.ingenieux.mojo.jbake.WatchMojo.java

Source

package br.com.ingenieux.mojo.jbake;

/*
 * Copyright 2013 ingenieux Labs
 *
 * 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.
 */

import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.plugins.annotations.Mojo;

import java.io.BufferedReader;
import java.io.InputStreamReader;
import java.util.concurrent.atomic.AtomicBoolean;

import br.com.ingenieux.mojo.jbake.util.DirWatcher;

import static org.apache.commons.lang.StringUtils.isBlank;

/**
 * Runs jbake on a folder while watching for changes
 */
@Mojo(name = "watch", requiresDirectInvocation = true, requiresProject = false)
public class WatchMojo extends GenerateMojo {

    public void executeInternal() throws MojoExecutionException {
        reRender();

        Long lastProcessed = Long.valueOf(System.currentTimeMillis());

        getLog().info("Now listening for changes on path " + inputDirectory.getPath());

        initServer();

        DirWatcher dirWatcher = null;

        try {
            dirWatcher = new DirWatcher(inputDirectory);
            final AtomicBoolean done = new AtomicBoolean(false);
            final BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

            (new Thread() {
                @Override
                public void run() {
                    try {
                        getLog().info("Running. Enter a blank line to finish. Anything else forces re-rendering.");

                        while (true) {
                            String line = reader.readLine();

                            if (isBlank(line)) {
                                break;
                            }

                            reRender();
                        }
                    } catch (Exception exc) {
                        getLog().info("Ooops", exc);
                    } finally {
                        done.set(true);
                    }
                }
            }).start();

            dirWatcher.start();

            do {
                Long result = dirWatcher.processEvents();

                if (null == result) {
                    // do nothing on purpose
                } else if (result >= lastProcessed) {
                    getLog().info("Refreshing");

                    super.reRender();

                    lastProcessed = Long.valueOf(System.currentTimeMillis());
                }
            } while (!done.get());
        } catch (Exception exc) {
            getLog().info("Oops", exc);

            throw new MojoExecutionException("Oops", exc);
        } finally {
            getLog().info("Finishing");

            if (null != dirWatcher)
                dirWatcher.stop();

            stopServer();
        }
    }

    protected void stopServer() throws MojoExecutionException {
    }

    protected void initServer() throws MojoExecutionException {
    }
}