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KAA-896: add ability to set failover strategy for failover manager
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94
...ore/src/main/java/org/kaaproject/kaa/client/channel/failover/DefaultFailoverStrategy.java
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|---|---|---|
| @@ -0,0 +1,94 @@ | ||
| /** | ||
| * Copyright 2014-2016 CyberVision, Inc. | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package org.kaaproject.kaa.client.channel.failover; | ||
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| import org.kaaproject.kaa.client.channel.FailoverDecision; | ||
| import org.kaaproject.kaa.client.channel.FailoverDecision.FailoverAction; | ||
| import org.kaaproject.kaa.client.channel.FailoverStatus; | ||
| import org.slf4j.Logger; | ||
| import org.slf4j.LoggerFactory; | ||
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| import java.util.concurrent.TimeUnit; | ||
|
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| /** | ||
| * Reference implementation for {@link FailoverStrategy}. | ||
| */ | ||
| public class DefaultFailoverStrategy implements FailoverStrategy { | ||
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| private static final Logger LOG = LoggerFactory.getLogger(DefaultFailoverStrategy.class); | ||
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| private static final long DEFAULT_BOOTSTRAP_SERVERS_RETRY_PERIOD = 2; | ||
| private static final long DEFAULT_OPERATION_SERVERS_RETRY_PERIOD = 2; | ||
| private static final long DEFAULT_NO_CONNECTIVITY_RETRY_PERIOD = 5; | ||
| private static final TimeUnit DEFAULT_TIME_UNIT = TimeUnit.SECONDS; | ||
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| private long bootstrapServersRetryPeriod; | ||
| private long operationsServersRetryPeriod; | ||
| private long noConnectivityRetryPeriod; | ||
| private TimeUnit timeUnit; | ||
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| public DefaultFailoverStrategy() { | ||
| this(DEFAULT_BOOTSTRAP_SERVERS_RETRY_PERIOD, | ||
| DEFAULT_OPERATION_SERVERS_RETRY_PERIOD, | ||
| DEFAULT_NO_CONNECTIVITY_RETRY_PERIOD, | ||
| DEFAULT_TIME_UNIT); | ||
| } | ||
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| public DefaultFailoverStrategy(long bootstrapServersRetryPeriod, | ||
| long operationsServersRetryPeriod, | ||
| long noConnectivityRetryPeriod, | ||
| TimeUnit timeUnit) { | ||
| this.bootstrapServersRetryPeriod = bootstrapServersRetryPeriod; | ||
| this.operationsServersRetryPeriod = operationsServersRetryPeriod; | ||
| this.noConnectivityRetryPeriod = noConnectivityRetryPeriod; | ||
| this.timeUnit = timeUnit; | ||
| } | ||
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| @Override | ||
| public FailoverDecision onFailover(FailoverStatus failoverStatus) { | ||
| LOG.trace("Producing failover decision for failover status: {}", failoverStatus); | ||
| switch (failoverStatus) { | ||
| case BOOTSTRAP_SERVERS_NA: | ||
| return new FailoverDecision(FailoverAction.RETRY, bootstrapServersRetryPeriod, timeUnit); | ||
| case CURRENT_BOOTSTRAP_SERVER_NA: | ||
| return new FailoverDecision(FailoverAction.USE_NEXT_BOOTSTRAP, bootstrapServersRetryPeriod, timeUnit); | ||
| case NO_OPERATION_SERVERS_RECEIVED: | ||
| return new FailoverDecision(FailoverAction.USE_NEXT_BOOTSTRAP, bootstrapServersRetryPeriod, timeUnit); | ||
| case OPERATION_SERVERS_NA: | ||
| return new FailoverDecision(FailoverAction.RETRY, operationsServersRetryPeriod, timeUnit); | ||
| case NO_CONNECTIVITY: | ||
| return new FailoverDecision(FailoverAction.RETRY, noConnectivityRetryPeriod, timeUnit); | ||
| default: | ||
| return new FailoverDecision(FailoverAction.NOOP); | ||
| } | ||
| } | ||
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| @Override | ||
| public long getBootstrapServersRetryPeriod() { | ||
| return bootstrapServersRetryPeriod; | ||
| } | ||
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| @Override | ||
| public long getOperationServersRetryPeriod() { | ||
| return operationsServersRetryPeriod; | ||
| } | ||
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| @Override | ||
| public TimeUnit getTimeUnit() { | ||
| return timeUnit; | ||
| } | ||
| } |
59 changes: 59 additions & 0 deletions
59
...-java-core/src/main/java/org/kaaproject/kaa/client/channel/failover/FailoverStrategy.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,59 @@ | ||
| /** | ||
| * Copyright 2014-2016 CyberVision, Inc. | ||
| * | ||
| * 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. | ||
| */ | ||
|
|
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| package org.kaaproject.kaa.client.channel.failover; | ||
|
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| import org.kaaproject.kaa.client.channel.FailoverDecision; | ||
| import org.kaaproject.kaa.client.channel.FailoverStatus; | ||
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| import java.util.concurrent.TimeUnit; | ||
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| /** | ||
| * Failover strategy is responsible for producing failover decisions based on failover statuses. | ||
| */ | ||
| public interface FailoverStrategy { | ||
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| /** | ||
| * Needs to be invoked to determine a decision that resolves the failover. | ||
| * | ||
| * @param failoverStatus current status of the failover. | ||
| * | ||
| * @return decision which is meant to resolve the failover. | ||
| * | ||
| * @see org.kaaproject.kaa.client.channel.FailoverDecision | ||
| * @see org.kaaproject.kaa.client.channel.FailoverStatus | ||
| */ | ||
| FailoverDecision onFailover(FailoverStatus failoverStatus); | ||
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| /** | ||
| * Use the {@link #getTimeUnit()} method to get current time unit. | ||
| * | ||
| * @return period of time after which will be made attempt to tweak bootstrap server. | ||
| */ | ||
| long getBootstrapServersRetryPeriod(); | ||
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| /** | ||
| * Use the {@link #getTimeUnit()} method to get current time unit. | ||
| * | ||
| * @return period of time after which will be made attempt to tweak operation server. | ||
| */ | ||
| long getOperationServersRetryPeriod(); | ||
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| /** | ||
| * @return time unit used within a scope of current failover strategy. | ||
| */ | ||
| TimeUnit getTimeUnit(); | ||
| } |
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