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Brooklyn entities for NoSQL data store software entities

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package brooklyn.entity.nosql.redis;

import static java.lang.String.format;

import java.util.List;

import brooklyn.entity.basic.AbstractSoftwareProcessSshDriver;
import brooklyn.entity.basic.Entities;
import brooklyn.entity.drivers.downloads.DownloadResolver;
import brooklyn.location.Location;
import brooklyn.location.basic.SshMachineLocation;
import brooklyn.util.MutableMap;
import brooklyn.util.ssh.CommonCommands;

import com.google.common.collect.ImmutableList;

/**
 * Start a {@link RedisStore} in a {@link Location} accessible over ssh.
 */
public class RedisStoreSshDriver extends AbstractSoftwareProcessSshDriver implements RedisStoreDriver {

    private String expandedInstallDir;

    public RedisStoreSshDriver(RedisStoreImpl entity, SshMachineLocation machine) {
        super(entity, machine);
    }

    private String getExpandedInstallDir() {
        if (expandedInstallDir == null) throw new IllegalStateException("expandedInstallDir is null; most likely install was not called");
        return expandedInstallDir;
    }

    @Override
    public void install() {
        DownloadResolver resolver = Entities.newDownloader(this);
        List urls = resolver.getTargets();
        String saveAs = resolver.getFilename();
        expandedInstallDir = getInstallDir()+"/"+resolver.getUnpackedDirectoryName(format("redis-%s", getVersion()));

        List commands = ImmutableList.builder()
                .addAll(CommonCommands.downloadUrlAs(urls, saveAs))
                .add(CommonCommands.INSTALL_TAR)
                .add("tar xzfv " + saveAs)
                .add(format("cd redis-%s", getVersion()))
                .add("make distclean")
                .add("make")
                .build();

        newScript(INSTALLING)
                .failOnNonZeroResultCode()
                .body.append(commands).execute();
    }

    @Override
    public void customize() {
        newScript(MutableMap.of("usePidFile", false), CUSTOMIZING)
                .failOnNonZeroResultCode()
                .body.append(
                        format("cd %s", getExpandedInstallDir()),
                        "make install PREFIX="+getRunDir())
                .execute();

        copyTemplate(getEntity().getConfig(RedisStore.REDIS_CONFIG_TEMPLATE_URL), "redis.conf");
    }

    @Override
    public void launch() {
        // TODO Should we redirect stdout/stderr: format(" >> %s/console 2>&1  /dev/null")
                .execute() == 0;
    }

    /**
     * Restarts redis with the current configuration.
     */
    @Override
    public void stop() {
        newScript(MutableMap.of("usePidFile", false), STOPPING)
                .failOnNonZeroResultCode()
                .body.append("./bin/redis-cli shutdown")
                .execute();
    }
}