org.apache.twill.api.AbstractTwillRunnable.java Source code

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Here is the source code for org.apache.twill.api.AbstractTwillRunnable.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.twill.api;

import com.google.common.collect.ImmutableMap;

import java.util.Map;

/**
 * This abstract class provides default implementation of the {@link TwillRunnable}.
 */
public abstract class AbstractTwillRunnable implements TwillRunnable {

    private Map<String, String> args;
    private TwillContext context;

    protected AbstractTwillRunnable() {
        this.args = ImmutableMap.of();
    }

    protected AbstractTwillRunnable(Map<String, String> args) {
        this.args = ImmutableMap.copyOf(args);
    }

    @Override
    public TwillRunnableSpecification configure() {
        return TwillRunnableSpecification.Builder.with().setName(getClass().getSimpleName()).withConfigs(args)
                .build();
    }

    @Override
    public void initialize(TwillContext context) {
        this.context = context;
        this.args = context.getSpecification().getConfigs();
    }

    @Override
    public void handleCommand(org.apache.twill.api.Command command) throws Exception {
        // No-op by default. Left for children class to override.
    }

    @Override
    public void stop() {
        // No-op by default. Left for children class to override.
    }

    @Override
    public void destroy() {
        // No-op by default. Left for children class to override.
    }

    protected Map<String, String> getArguments() {
        return args;
    }

    protected String getArgument(String key) {
        return args.get(key);
    }

    protected TwillContext getContext() {
        return context;
    }
}