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Diffstat (limited to 'qpid/java/client/src/main/java/org/apache/qpid/client/failover/FailoverNoopSupport.java')
-rw-r--r-- | qpid/java/client/src/main/java/org/apache/qpid/client/failover/FailoverNoopSupport.java | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/qpid/java/client/src/main/java/org/apache/qpid/client/failover/FailoverNoopSupport.java b/qpid/java/client/src/main/java/org/apache/qpid/client/failover/FailoverNoopSupport.java new file mode 100644 index 0000000000..51cc94965a --- /dev/null +++ b/qpid/java/client/src/main/java/org/apache/qpid/client/failover/FailoverNoopSupport.java @@ -0,0 +1,75 @@ +/* + * 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.qpid.client.failover; + +import org.apache.qpid.client.AMQConnection; + +/** + * FailoverNoopSupport is a {@link FailoverSupport} implementation that does not really provide any failover support + * at all. It wraps a {@link FailoverProtectedOperation} but should that operation throw {@link FailoverException} this + * support class simply re-raises that exception as an IllegalStateException. This support wrapper should only be + * used where the caller can be certain that the failover protected operation cannot acutally throw a failover exception, + * for example, because the caller already holds a lock preventing that condition from arising. + * + * <p><table id="crc"><caption>CRC Card</caption> + * <tr><th> Responsibilities <th> Collaborations + * <tr><td> Perform a fail-over protected operation raising providing no handling of fail-over conditions. + * </table> + */ +public class FailoverNoopSupport<T, E extends Exception> implements FailoverSupport<T, E> +{ + /** The protected operation that is to be retried in the event of fail-over. */ + FailoverProtectedOperation<T, E> operation; + + /** The connection on which the fail-over protected operation is to be performed. */ + AMQConnection connection; + + /** + * Creates an automatic retrying fail-over handler for the specified operation. + * + * @param operation The fail-over protected operation to wrap in this handler. + */ + public FailoverNoopSupport(FailoverProtectedOperation<T, E> operation, AMQConnection con) + { + this.operation = operation; + this.connection = con; + } + + /** + * Delegates to another continuation which is to be provided with fail-over handling. + * + * @return The return value from the delegated to continuation. + * @throws E Any exception that the delegated to continuation may raise. + */ + public T execute() throws E + { + try + { + return operation.execute(); + } + catch (FailoverException e) + { + throw new IllegalStateException("Fail-over interupted no-op failover support. " + + "No-op support should only be used where the caller is certain fail-over cannot occur.", e); + } + } +} |