com.adaptris.core.services.ScriptingServiceImp.java Source code

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Here is the source code for com.adaptris.core.services.ScriptingServiceImp.java

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/*
 * Copyright 2015 Adaptris Ltd.
 * 
 * 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 com.adaptris.core.services;

import java.io.IOException;
import java.io.Reader;

import javax.script.Bindings;
import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

import org.apache.commons.lang3.BooleanUtils;
import org.hibernate.validator.constraints.NotBlank;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.adaptris.annotation.InputFieldDefault;
import com.adaptris.core.AdaptrisMessage;
import com.adaptris.core.CoreException;
import com.adaptris.core.DynamicPollingTemplate;
import com.adaptris.core.ServiceException;
import com.adaptris.core.ServiceImp;
import com.adaptris.core.util.Args;
import com.adaptris.core.util.ExceptionHelper;

/**
 * Base class for enabling JSR223 enabled scripting languages.
 * 
 * 
 * @author lchan
 * 
 */
public abstract class ScriptingServiceImp extends ServiceImp implements DynamicPollingTemplate.TemplateProvider {

    private transient Logger log = LoggerFactory.getLogger(this.getClass().getName());

    @NotBlank
    private String language;
    private transient ScriptEngineManager fatController;
    private transient ScriptEngine engine;

    @InputFieldDefault(value = "false")
    private Boolean branchingEnabled;

    public ScriptingServiceImp() {
        super();
    }

    @Override
    public final void doService(AdaptrisMessage msg) throws ServiceException {
        try {
            Bindings vars = engine.createBindings();
            vars.put("message", msg);
            vars.put("log", log);
            try (Reader input = createReader()) {
                engine.eval(input, vars);
            }
        } catch (Exception e) {
            throw ExceptionHelper.wrapServiceException(e);
        }
    }

    protected abstract Reader createReader() throws IOException;

    @Override
    protected void initService() throws CoreException {
        try {
            Args.notBlank(language, "language");
            String error = String.format("getEngineByName('%s')", getLanguage());
            fatController = new ScriptEngineManager(this.getClass().getClassLoader());
            engine = Args.notNull(fatController.getEngineByName(getLanguage()), error);
        } catch (Exception e) {
            throw ExceptionHelper.wrapCoreException(e);
        }
    }

    @Override
    protected void closeService() {
    }

    @Override
    public void start() throws CoreException {
        super.start();
    }

    @Override
    public void stop() {
        super.stop();
    }

    public String getLanguage() {
        return language;
    }

    /**
     * Set the language the the script is written in.
     *
     * @param s a JSR223 supported language.
     */
    public void setLanguage(String s) {
        language = Args.notBlank(s, "language");
    }

    @Override
    public void prepare() throws CoreException {
    }

    @Override
    public boolean isBranching() {
        return BooleanUtils.toBooleanDefaultIfNull(getBranchingEnabled(), false);
    }

    public Boolean getBranchingEnabled() {
        return branchingEnabled;
    }

    /**
     * Specify whether or not this service is branching.
     * 
     * @param branching true to cause {@link #isBranching()} to return true; default is false.
     * @see com.adaptris.core.Service#isBranching()
     * @since 3.4.0
     */
    public void setBranchingEnabled(Boolean branching) {
        this.branchingEnabled = branching;
    }

}