com.bennavetta.appsite.processor.scripting.ScriptFactory.java Source code

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Here is the source code for com.bennavetta.appsite.processor.scripting.ScriptFactory.java

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/**
 * Copyright 2013 Ben Navetta <ben@bennavetta.com>
 *
 * 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.bennavetta.appsite.processor.scripting;

import java.util.concurrent.TimeUnit;

import com.google.common.cache.CacheBuilder;
import com.google.common.cache.CacheLoader;
import com.google.common.cache.LoadingCache;

public class ScriptFactory {
    private ScriptCompiler compiler;

    private LoadingCache<String, Script> cache;

    public ScriptFactory(ScriptCompiler compiler, long maxSize, long scriptLife, TimeUnit unit) {
        this.compiler = compiler;
        this.cache = CacheBuilder.newBuilder().maximumSize(maxSize).expireAfterWrite(scriptLife, unit)
                .build(new CacheLoader<String, Script>() {
                    @Override
                    public Script load(String key) throws Exception {
                        return ScriptFactory.this.compiler.compile(key);
                    }
                });
    }

    public ScriptFactory(ScriptCompiler compiler) {
        this(compiler, 100, 10, TimeUnit.MINUTES);
        // don't use a really big value for the expiration because we don't want to keep old/rarely used scripts around forever 
    }

    public Script getScript(String source) throws Exception {
        return cache.get(source);
    }

    public ScriptCompiler getCompiler() {
        return compiler;
    }

    public void setCompiler(ScriptCompiler compiler) {
        this.compiler = compiler;
    }
}