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    • org.gradle.tooling.internal.consumer.BlockingResultHandler Maven / Gradle / Ivy

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    /*
 * Copyright 2011 the original author or authors.
 *
 * 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 org.gradle.tooling.internal.consumer;

import org.gradle.internal.UncheckedException;
import org.gradle.tooling.GradleConnectionException;
import org.gradle.tooling.ResultHandler;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.concurrent.ArrayBlockingQueue;
import java.util.concurrent.BlockingQueue;

public class BlockingResultHandler implements ResultHandler {
    private final BlockingQueue queue = new ArrayBlockingQueue(1);
    private final Class resultType;
    private static final Object NULL = new Object();

    public BlockingResultHandler(Class resultType) {
        this.resultType = resultType;
    }

    public T getResult() {
        Object result;
        try {
            result = queue.take();
        } catch (InterruptedException e) {
            throw UncheckedException.throwAsUncheckedException(e);
        }

        if (result instanceof Throwable) {
            throw UncheckedException.throwAsUncheckedException(attachCallerThreadStackTrace((Throwable) result));
        }
        if (result == NULL) {
            return null;
        }
        return resultType.cast(result);
    }

    public static Throwable attachCallerThreadStackTrace(Throwable failure) {
        List adjusted = new ArrayList();
        adjusted.addAll(Arrays.asList(failure.getStackTrace()));
        List currentThreadStack = Arrays.asList(Thread.currentThread().getStackTrace());
        if (!currentThreadStack.isEmpty()) {
            adjusted.addAll(currentThreadStack.subList(2, currentThreadStack.size()));
        }
        failure.setStackTrace(adjusted.toArray(new StackTraceElement[0]));
        return failure;
    }

    public void onComplete(T result) {
        queue.add(result == null ? NULL : result);
    }

    public void onFailure(GradleConnectionException failure) {
        queue.add(failure);
    }
}
    
    
    
    

    




    
    
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