com.softlayer.api.http.BuiltInHttpClientFactory Maven / Gradle / Ivy
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API client for accessing the SoftLayer API
package com.softlayer.api.http;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.UnsupportedEncodingException;
import java.net.HttpURLConnection;
import java.net.URL;
import java.util.List;
import java.util.Map;
import java.util.concurrent.Callable;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.Future;
import java.util.concurrent.ThreadFactory;
import java.util.concurrent.locks.ReadWriteLock;
import java.util.concurrent.locks.ReentrantReadWriteLock;
import com.softlayer.api.ResponseHandler;
/**
* Default implementation of {@link HttpClientFactory} that only supports simple {@link HttpURLConnection}.
*/
class BuiltInHttpClientFactory extends ThreadPooledHttpClientFactory {
// Volatile is not enough here, we have to have more control over setting and what not
ExecutorService threadPool;
boolean threadPoolUserDefined;
final ReadWriteLock threadPoolLock = new ReentrantReadWriteLock();
@Override
public BuiltInHttpClient getHttpClient(HttpCredentials credentials, String method,
String fullUrl, Map> headers) {
return new BuiltInHttpClient(credentials, method, fullUrl, headers);
}
public ExecutorService getThreadPool() {
// We support lazy loading in this method and we guarantee it's thread safe, but we do not
// synchronize on it to prevent lock down on the entire class during lots of contention
// especially since the lazy-loading is expected to be rare.
threadPoolLock.readLock().lock();
try {
if (threadPool != null) {
return threadPool;
}
} finally {
threadPoolLock.readLock().unlock();
}
threadPoolLock.writeLock().lock();
try {
if (threadPool == null) {
// Here, we want to use a cached thread pool by default, but we need a custom thread
// factory to make the threads daemon threads. This default can be overridden by users,
// but in general we do not want the API client to hold a process open by default.
threadPool = Executors.newCachedThreadPool(new ThreadFactory() {
final ThreadFactory defaultFactory = Executors.defaultThreadFactory();
@Override
public Thread newThread(Runnable r) {
Thread thread = defaultFactory.newThread(r);
thread.setDaemon(true);
return thread;
}
});
threadPoolUserDefined = false;
}
return threadPool;
} finally {
threadPoolLock.writeLock().unlock();
}
}
@Override
public void setThreadPool(ExecutorService threadPool) {
threadPoolLock.writeLock().lock();
try {
// Shutdown existing one if a new one is being given and the existing
// one is the default. Otherwise, if there was an existing one and it
// was supplied by the user, it's his responsibility to shut it down.
if (this.threadPool != null && !threadPoolUserDefined) {
this.threadPool.shutdownNow();
}
this.threadPool = threadPool;
threadPoolUserDefined = threadPool != null;
} finally {
threadPoolLock.writeLock().unlock();
}
}
class BuiltInHttpClient implements HttpClient, HttpResponse {
final HttpCredentials credentials;
final String method;
final String fullUrl;
final Map> headers;
HttpURLConnection connection;
public BuiltInHttpClient(
HttpCredentials credentials,
String method,
String fullUrl,
Map> headers
) {
this.credentials = credentials;
this.method = method;
this.fullUrl = fullUrl;
this.headers = headers;
}
@Override
public OutputStream getBodyStream() {
try {
connection.setDoOutput(true);
return connection.getOutputStream();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
void openConnection() {
try {
connection = (HttpURLConnection) new URL(fullUrl).openConnection();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public HttpResponse invokeSync(Callable setupBody) {
// We let HTTP URL connection do its invocation when it wants. The built-in HTTP connection
// usually starts a stream when the request method is set or when the output or response code
// is requested. It switches from send to receive when the output or response code is requested.
// Its resources are closed when the send stream (if used) and receive stream (if used) are
// closed and internally the JVM is allowed to pool connections to common hosts which makes this
// fairly fast and safe.
openConnection();
if (credentials != null) {
connection.addRequestProperty(
"Authorization",
credentials.getHeader()
);
}
for (Map.Entry> headerEntry : headers.entrySet()) {
for (String headerValue : headerEntry.getValue()) {
connection.addRequestProperty(headerEntry.getKey(), headerValue);
}
}
try {
connection.setRequestMethod(method);
setupBody.call();
} catch (Exception e) {
throw new RuntimeException(e);
}
return this;
}
@Override
public Future invokeAsync(final Callable setupBody) {
return getThreadPool().submit(() -> invokeSync(setupBody));
}
@Override
public Future invokeAsync(final Callable setupBody, final ResponseHandler callback) {
return getThreadPool().submit(() -> {
HttpResponse response;
try {
response = invokeSync(setupBody);
} catch (Exception e) {
callback.onError(e);
return null;
}
callback.onSuccess(response);
return null;
});
}
@Override
public void close() throws IOException {
// Nothing to do, callers are expected to close streams they use
}
@Override
public int getStatusCode() {
try {
return connection.getResponseCode();
} catch (IOException e) {
throw new RuntimeException(e);
}
}
@Override
public Map> getHeaders() {
return connection.getHeaderFields();
}
@Override
public InputStream getInputStream() {
try {
// Asking for the input stream on non-success will fail
if (connection.getResponseCode() >= 200 && connection.getResponseCode() < 300) {
return connection.getInputStream();
} else {
return connection.getErrorStream();
}
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
}