GitAsyncTask.java

/*
 * Copyright (c) 2011, 2012 Roberto Tyley
 *
 * This file is part of 'Agit' - an Android Git client.
 *
 * Agit is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Agit is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/ .
 */

package com.madgag.agit.operations;

import static android.R.drawable.stat_notify_error;
import static com.google.common.base.Strings.isNullOrEmpty;
import static java.lang.System.currentTimeMillis;
import android.app.Application;
import android.os.Handler;
import android.util.Log;

import com.google.common.base.Strings;
import com.google.inject.Inject;
import com.google.inject.Provider;
import com.google.inject.assistedinject.Assisted;
import com.google.inject.name.Named;
import com.madgag.agit.operation.lifecycle.OperationLifecycleSupport;
import com.madgag.android.blockingprompt.PromptBroker;

import java.util.concurrent.Future;

import org.eclipse.jgit.util.StringUtils;

import roboguice.inject.ContextScope;
import roboguice.util.RoboAsyncTask;

public class GitAsyncTask extends RoboAsyncTask<OpNotification> implements ProgressListener<Progress> {

    public final static String TAG = "GAT";

    @Inject
    ContextScope contextScope;
    @Inject
    GitOperationExecutor operationExecutor;
    @Inject
    Provider<PromptBroker> promptBrokerProvider;

    private final GitOperation operation;
    private final OperationLifecycleSupport lifecycleSupport;

    private long startTime;

    private Progress latestProgress;

    private final Runnable publishOnUIThreadRunnable = new Runnable() {
        public void run() {
            publishLatestProgress();
        }
    };

    @Inject
    public GitAsyncTask(
            Application application,
            @Named("uiThread") Handler handler,
            @Assisted GitOperation operation,
            @Assisted OperationLifecycleSupport lifecycleSupport) {
        super(application);
        handler(handler);
        this.operation = operation;
        this.lifecycleSupport = lifecycleSupport;
    }

    @Override
    protected void onPreExecute() {
        Log.d(TAG, "Starting onPreExecute " + operation + " handler=" + handler);
        lifecycleSupport.startedWith(new OpNotification(operation.getOngoingIcon(), operation.getTickerText(),
                operation.getShortDescription(), operation.getUrl().toString()));
        startTime = currentTimeMillis();
    }

    public OpNotification call() throws Exception {
        contextScope.enter(getContext());
        try {
            return operationExecutor.call(operation, new OperationUIContext(this, promptBrokerProvider), true);
        } finally {
            contextScope.exit(getContext());
        }
    }

    @Override
    protected void onSuccess(OpNotification opResult) {
        long duration = currentTimeMillis() - startTime;
        Log.d(TAG, "Completed in " + duration + " ms");
        lifecycleSupport.success(opResult);
        lifecycleSupport.completed(opResult);
    }

    @Override
    protected void onThrowable(Throwable e) throws RuntimeException {
        String opName = operation.getName();
        boolean cancelled = operation.isCancelled();
        Log.e(TAG, "Examining exception " + e + " op " + operation + " cancelled=" + cancelled, e);
        String message = e.getMessage();

        if (isNullOrEmpty(message)) {
            message = e.getClass().getName();
        }

        OpNotification notification =
                cancelled ? new OpNotification(stat_notify_error, opName + " cancelled",
                        operation.getUrl().toString()) :
                        new OpNotification(stat_notify_error, opName + " failed", message);
        lifecycleSupport.error(notification);
        lifecycleSupport.completed(notification);
    }

    // Called on background thread
    public void publish(Progress... values) {
        latestProgress = values[values.length - 1];
        handler().post(publishOnUIThreadRunnable);
        Log.d(TAG, "Posted " + latestProgress);
    }

    protected void publishLatestProgress() {
        lifecycleSupport.publish(latestProgress);
        Log.d(TAG, "Called lifecycle publisher with " + latestProgress);
    }

    public GitOperation getOperation() {
        return operation;
    }

    public Future<Void> getFutureInUse() {
        return future;
    }

    @Override
    public String toString() {
        return getClass().getSimpleName() + "[" + operation + "]";
    }
}