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| 1 | +package org.glassfish.jersey.resilient.connector; |
| 2 | + |
| 3 | +import java.util.concurrent.Future; |
| 4 | + |
| 5 | +import javax.ws.rs.client.Client; |
| 6 | +import javax.ws.rs.core.Configuration; |
| 7 | + |
| 8 | +import org.glassfish.jersey.client.ClientRequest; |
| 9 | +import org.glassfish.jersey.client.ClientResponse; |
| 10 | +import org.glassfish.jersey.client.spi.AsyncConnectorCallback; |
| 11 | +import org.glassfish.jersey.client.spi.Connector; |
| 12 | +import org.glassfish.jersey.internal.util.PropertiesHelper; |
| 13 | +import org.glassfish.jersey.resilient.connector.ResilientConnectorProvider.HystrixCommandConfigProvider; |
| 14 | + |
| 15 | +import com.netflix.hystrix.HystrixCommand; |
| 16 | +import com.netflix.hystrix.HystrixObservableCommand; |
| 17 | + |
| 18 | +import jersey.repackaged.com.google.common.util.concurrent.SettableFuture; |
| 19 | +import rx.Observable; |
| 20 | +import rx.Observable.OnSubscribe; |
| 21 | +import rx.Subscriber; |
| 22 | +import rx.functions.Action0; |
| 23 | +import rx.functions.Action1; |
| 24 | + |
| 25 | +class ResilientConnector implements Connector { |
| 26 | + |
| 27 | + private final Connector delegateConnector; |
| 28 | + |
| 29 | + private final HystrixCommandConfigProvider hystrixCommandConfigProvider; |
| 30 | + |
| 31 | + public ResilientConnector(Client client, Configuration runtimeConfig, Connector delegateConnector) { |
| 32 | + this.delegateConnector = delegateConnector; |
| 33 | + this.hystrixCommandConfigProvider = initCommandConfigProvider(runtimeConfig); |
| 34 | + } |
| 35 | + |
| 36 | + @Override |
| 37 | + public ClientResponse apply(final ClientRequest request) { |
| 38 | + com.netflix.hystrix.HystrixCommand.Setter setter = hystrixCommandConfigProvider.commandConfig(request); |
| 39 | + HystrixCommand<ClientResponse> command = new HystrixCommand<ClientResponse>(setter) { |
| 40 | + |
| 41 | + @Override |
| 42 | + protected ClientResponse run() throws Exception { |
| 43 | + return delegateConnector.apply(request); |
| 44 | + } |
| 45 | + }; |
| 46 | + return command.execute(); |
| 47 | + } |
| 48 | + |
| 49 | + @Override |
| 50 | + public Future<?> apply(final ClientRequest request, final AsyncConnectorCallback callback) { |
| 51 | + com.netflix.hystrix.HystrixObservableCommand.Setter setter = |
| 52 | + hystrixCommandConfigProvider.observableCommandConfig(request); |
| 53 | + HystrixObservableCommand<ClientResponse> observableCommand = new HystrixObservableCommand<ClientResponse>(setter) { |
| 54 | + |
| 55 | + @Override |
| 56 | + protected Observable<ClientResponse> construct() { |
| 57 | + return Observable.create(new OnSubscribe<ClientResponse>() { |
| 58 | + |
| 59 | + @Override |
| 60 | + public void call(Subscriber<? super ClientResponse> observer) { |
| 61 | + delegateConnector.apply(request, callback); |
| 62 | + } |
| 63 | + }); |
| 64 | + } |
| 65 | + }; |
| 66 | + final SettableFuture<ClientResponse> settableFuture = SettableFuture.create(); |
| 67 | + OnNext onNext = new OnNext(); |
| 68 | + OnError onError = new OnError(settableFuture, callback); |
| 69 | + OnComplete onComplete = new OnComplete(onNext, settableFuture, callback); |
| 70 | + |
| 71 | + observableCommand.observe().subscribe(onNext, onError, onComplete); |
| 72 | + return settableFuture; |
| 73 | + } |
| 74 | + |
| 75 | + @Override |
| 76 | + public String getName() { |
| 77 | + return "Resilient_" + delegateConnector.getName(); |
| 78 | + } |
| 79 | + |
| 80 | + @Override |
| 81 | + public void close() { |
| 82 | + delegateConnector.close(); |
| 83 | + } |
| 84 | + |
| 85 | + private static HystrixCommandConfigProvider initCommandConfigProvider(Configuration runtimeConfig) { |
| 86 | + Object value = runtimeConfig.getProperty(ResilientConnectorProvider.HYSTRIX_COMMAND_CONFIG_PROVIDER); |
| 87 | + if (value != null) { |
| 88 | + return PropertiesHelper.convertValue(value, HystrixCommandConfigProvider.class); |
| 89 | + } |
| 90 | + return new DefaultHystrixCommandConfigProvider(); |
| 91 | + } |
| 92 | + |
| 93 | + private static class OnNext implements Action1<ClientResponse> { |
| 94 | + |
| 95 | + private ClientResponse response; |
| 96 | + |
| 97 | + @Override |
| 98 | + public void call(ClientResponse response) { |
| 99 | + this.response = response; |
| 100 | + } |
| 101 | + |
| 102 | + ClientResponse get() { |
| 103 | + return this.response; |
| 104 | + } |
| 105 | + } |
| 106 | + |
| 107 | + private static class OnError implements Action1<Throwable> { |
| 108 | + |
| 109 | + private AsyncConnectorCallback callback; |
| 110 | + private SettableFuture<ClientResponse> settableFuture; |
| 111 | + |
| 112 | + OnError(SettableFuture<ClientResponse> settableFuture, AsyncConnectorCallback callback) { |
| 113 | + this.settableFuture = settableFuture; |
| 114 | + this.callback = callback; |
| 115 | + } |
| 116 | + |
| 117 | + @Override |
| 118 | + public void call(Throwable failure) { |
| 119 | + settableFuture.setException(failure); |
| 120 | + callback.failure(failure); |
| 121 | + } |
| 122 | + } |
| 123 | + |
| 124 | + private static class OnComplete implements Action0 { |
| 125 | + |
| 126 | + private OnNext onNext; |
| 127 | + private AsyncConnectorCallback callback; |
| 128 | + private SettableFuture<ClientResponse> settableFuture; |
| 129 | + |
| 130 | + OnComplete(OnNext onNext, SettableFuture<ClientResponse> settableFuture, AsyncConnectorCallback callback) { |
| 131 | + this.onNext = onNext; |
| 132 | + this.settableFuture = settableFuture; |
| 133 | + this.callback = callback; |
| 134 | + } |
| 135 | + |
| 136 | + @Override |
| 137 | + public void call() { |
| 138 | + settableFuture.set(onNext.get()); |
| 139 | + callback.response(onNext.get()); |
| 140 | + } |
| 141 | + } |
| 142 | +} |
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