com.spotify.docker.client.ProgressStream.java Source code

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Here is the source code for com.spotify.docker.client.ProgressStream.java

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/*-
 * -\-\-
 * docker-client
 * --
 * Copyright (C) 2016 Spotify AB
 * --
 * 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.spotify.docker.client;

import static com.google.common.io.ByteStreams.copy;
import static com.google.common.io.ByteStreams.nullOutputStream;
import static com.spotify.docker.client.ObjectMapperProvider.objectMapper;

import com.fasterxml.jackson.core.JsonParser;
import com.fasterxml.jackson.databind.MappingIterator;
import com.spotify.docker.client.exceptions.DockerException;
import com.spotify.docker.client.exceptions.DockerTimeoutException;
import com.spotify.docker.client.messages.ProgressMessage;

import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.net.SocketTimeoutException;
import java.net.URI;

class ProgressStream implements Closeable {

    private final InputStream stream;
    private final MappingIterator<ProgressMessage> iterator;

    ProgressStream(final InputStream stream) throws IOException {
        this.stream = stream;
        final JsonParser parser = objectMapper().getFactory().createParser(stream);
        iterator = objectMapper().readValues(parser, ProgressMessage.class);
    }

    public boolean hasNextMessage(final String method, final URI uri) throws DockerException {
        try {
            return iterator.hasNextValue();
        } catch (SocketTimeoutException e) {
            throw new DockerTimeoutException(method, uri, e);
        } catch (IOException e) {
            throw new DockerException(e);
        }
    }

    public ProgressMessage nextMessage(final String method, final URI uri) throws DockerException {
        try {
            return iterator.nextValue();
        } catch (SocketTimeoutException e) {
            throw new DockerTimeoutException(method, uri, e);
        } catch (IOException e) {
            throw new DockerException(e);
        }
    }

    public void tail(ProgressHandler handler, final String method, final URI uri) throws DockerException {
        while (hasNextMessage(method, uri)) {
            handler.progress(nextMessage(method, uri));
        }
    }

    @Override
    public void close() throws IOException {
        // Jersey will close the stream and release the connection after we read all the data.
        // We cannot call the stream's close method because it an instance of UncloseableInputStream,
        // where close is a no-op.
        copy(stream, nullOutputStream());
    }
}