johnzon-core/src/test/java/org/apache/johnzon/core/BufferStrategyFactoryTest.java

/*
 * 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.johnzon.core;

import java.io.StringWriter;
import java.util.HashMap;
import java.util.concurrent.atomic.AtomicInteger;

import jakarta.json.spi.JsonProvider;
import jakarta.json.stream.JsonGenerator;

import org.junit.Test;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import static org.junit.Assert.assertTrue;

public class BufferStrategyFactoryTest {

    @Test
    public void testDefaultStrategies() {
        verify(BufferStrategyFactory.valueOf("BY_INSTANCE"));
        verify(BufferStrategyFactory.valueOf("THREAD_LOCAL"));
        verify(BufferStrategyFactory.valueOf("QUEUE"));
        verify(BufferStrategyFactory.valueOf("SINGLETON"));
    }

    @Test(expected = IllegalArgumentException.class)
    public void testNotExistingStrategy() {
        BufferStrategyFactory.valueOf("NOT_EXISTING");
    }

    @Test
    public void testFqcnBufferStrategy() {
        verify(BufferStrategyFactory.valueOf(DummyBufferStrategy.class.getName()));
    }

    @Test
    public void testJsonGeneratorStrategyFromClass() {
        DummyBufferStrategy.counter.set(0);

        StringWriter sw = new StringWriter();
        JsonGenerator generator = JsonProvider.provider().createGeneratorFactory(new HashMap<String, Object>() {
            {
                put(AbstractJsonFactory.BUFFER_STRATEGY, DummyBufferStrategy.class.getName());
            }
        }).createGenerator(sw);


        generator.writeStartObject()
                .write("age", 27)
                .write("name", "karl")
                .writeEnd()
                .flush();

        assertEquals(1, DummyBufferStrategy.counter.get());
        assertEquals("{\"age\":27,\"name\":\"karl\"}", sw.toString());
    }

    private void verify(Object bufferStrategy) {
        assertNotNull(bufferStrategy);
        assertTrue(bufferStrategy instanceof BufferStrategy);
    }

    public static final class DummyBufferStrategy implements BufferStrategy {
        private static AtomicInteger counter = new AtomicInteger(0);
        private BufferStrategy delegate = BufferStrategyFactory.valueOf("BY_INSTANCE");

        @Override
        public BufferProvider<char[]> newCharProvider(int size) {
            counter.incrementAndGet();
            return delegate.newCharProvider(size);
        }
    }
}